An analytical chemist is titrating of a solution of ethylamine with a solution of . The of ethylamine is . Calculate the pH of the base solution after the chemist has added of the solution to it. Note for advanced students: you may assume the final volume equals the initial volume of the solution plus the volume of solution added. g

Answers

Answer 1

Answer:

pH=11.

Explanation:

Hello!

In this case, since the data is not given, it is possible to use a similar problem like:

"An analytical chemist is titrating 185.0 mL of a 0.7500 M solution of ethylamine(C2HNH2) with a 0.4800 M solution of HNO3.ThepK,of ethylamine is 3.19. Calculate the pH of the base solution after the chemist has added 114.4 mL of the HNO3 solution to it"

Thus, for the reaction:

[tex]C_2H_5NH_2+H^+\rightleftharpoons C_2H_5NH_4^+[/tex]

Tt is possible to compute the remaining moles of ethylamine via the following subtraction:

[tex]n_{ethylamine}=0.1850L*0.7500mol/L=0.1365mol\\\\n_{acid}=0.1144L*0.4800mol/L=0.0549mol\\\\n_{ethylamine}^{remaining}=0.1365mol-0.0549mol=0.0816mol[/tex]

Thus, the concentration of ethylamine in solution is:

[tex][ethylamine]=\frac{0.0816mol}{0.1850L+0.1144L}=0.2725M[/tex]

Now, we can also infer that some salt is formed, and has the following concentration:

[tex][salt]=\frac{0.0549mol}{0.1850L+0.1144L}=0.1834M[/tex]

Therefore, we can use the Henderson-Hasselbach equation to compute the resulting pOH first:

[tex]pOH=pKb+log(\frac{[salt]}{[base]} )\\\\pOH=3.19+log(\frac{0.1834M}{0.2725M})\\\\pOH=3.0[/tex]

Finally, the pH turns out to be:

[tex]pH=14-pOH=14-3\\\\pH=11[/tex]

NOTE: keep in mind that if you have different values, you can just change them and follow the very same process here.

Best regards!


Related Questions

Helpppppp plsssssssss

Answers

You are correct so far just add Ibex and the grass! Biotic means living

Answer:

air,water,rocks,and the ibex

Explanation:

these are the non living things I'm pretty sure

How are scientists trying to use a plant catalyst to create solar fuels? Someone please answer?

Answers

Answer:

plants can be used as fuel because plants can be burned so they compose the plants to make a liquid

john roller skates with a constant speed of 8 miles per hour. how long will he take to travel a distance of 28 miles? please use the formula Speed = Distance/Time

Answers

Answer:

3.5hrs

Explanation:

Using the formula Speed = Distance/Time

Given

Speed = 8mi/hr

Distance = 28miles

Get the time

Time = Distance/Speed

Time = 28/8

Tme = 3.5hrs

Hence it will take 3.5hrs to travel

A certain rock has a mixture of several different elements. It contains 33g of zinc, 22g of
iron and 16g of oxygen. What percentage of the rock, by mass, is zinc?

Answers

Zinc is available in capsules, tablets, creams, ointments, and a liquid form. Adults aged 19 years and over who are interested in using zinc supplements should be careful to consume no more than 40 mg per day. Too much zinc can cause health problems.

Answer:

46.5%

Explanation:

mass of rock = 33g + 22g + 16g = 71g

% mass of zinc = (33/71) * 100%

= 0.465 * 100%

= 46.5%

what is the overall equilibrium constant of 4NH3+7O2=4NO2+6H2O

Answers

Answer:

An apple, potato, and onion all taste the same if you eat them with your nose plugged

Explanation:

which of these would best describe the outcome of increasing the kinetic energy of molecules in the picture above?

Answers

Can you show a picture please?

balance kclo3-kcl+02​

Answers

What are you trying to find?

of nitrogen gas)?
How many grams of H2 are needed to produce 71.1 g of ammonia (NH3) (assuming unlimited availability
3 H2+ N2 + 2NH3
Provide the answer with 3 or more significant figures.

Answers

Answer:

[tex]m_{H_2}=12.6gH_2[/tex]

Explanation:

Hello there!

In this case, given the reaction:

[tex]3 H_2+ N_2 \rightarrow 2NH_3[/tex]

It is possible to compute the necessary grams of hydrogen which produce 71.1 g of ammonia, given the 3:2 mole ratio and their molar mass as shown below:

[tex]m_{H_2}=71.1gNH_3*\frac{1molNH_3}{17.04gNH_3}*\frac{3molH_2}{2molNH_3} *\frac{2.02gH_2}{1molH_2}\\\\m_{H_2}=12.6gH_2[/tex]

Best regards!

chemical formula for calculating pressure​

Answers

Answer:

First, let's review the ideal gas law, PV = nRT. In this equation, 'P' is the pressure in atmospheres, 'V' is the volumes in liters, 'N' is the number of particles in moles, 'T' is the temperature in Kelvin and 'R' is the ideal gas constant (0.0821 liter atmosphere per moles Kelvin).

Explanation:

I majored in Chemistry

What are some positive and negative things about living near a volcano?

Answers

Pros and cons If a volcano erupts, homes can be destroyed, and thousands could be left homeless, or could be killed.
If a volcano erupts a lot of wildlife could be killed, and many species can go extinct because of the eruptions.
If lava is flowing onto a road, people cannot out run it.
People can suffocate on ash

A student dissolves 14.8 g of ammonium nitrate (NH4NO2) in 300. g of water in a well-insulated open cup. He then observes the temperature of the water fall from 20.0°C to 15.0°C over the course of 4.3 minutes. Use this data, and any information you need from the ALEKS Data resource, to answer the questions below about this reaction:

NH4NO3(s) → NH4+(aq) + NO3^- (aq)

Required:
a. Is this reaction exothermic, endothermic, or neither?
b. If you said the reaction was exothermic or endothermic, calculate the amount of heat that was released or absorbed by the reaction in this case.

Answers

Answer:

a. Endothermic

b. 6586J are absorbed.

Explanation:

a. When the reaction occurs, the temperature is decreasing from 20.0°C to 15.0°C, that means the reaction is absorbing heat and is endothermic.

b. To find the heat absorbed we must use:

Q = -m*ΔT*C

Where Q is change in heat,

m is the mass of solution (300g + 14.8g = 314.8g)

ΔT is change in temperature (15.0°C - 20.0° = -5.0°C)

And C is specific heat of the solution (4.184J/g°C assuming is the same heat than the heat of pure water).

Replacing:

Q = -314.8g*-5.0°C*4.184J/g°C

Q =

6586J are absorbed

Dos Identy each statement whether TRUE or FALSE. Write you answer m
1. Mammals are warm blooded animals that are born alive.
2. Reptiles are cold blooded vertebrates that are hatched from egs.
3. Vertebrates have no economic importance to our environment.
4. There is a significant relationship between vertebrates
5. Invertebrate animals are important to human beings.
and invertebrates.​

Answers

Answer:

1=true

2=false

3=false

4=true

5=true

how many litres of hydrogen is present in 12 grams of hydrogen​

Answers

Answer:

10 the power of 23 hydrogen atom

A tank contains one hundred fifty kmol of an aqueous phosphoric acid solution with 5.00 mole% H3PO4. The solution is concentrated by adding pure phosphoric acid at a rate of 30.0 L/min. Molecular weight of phosphoric acid is 98. Density of phosphoric acid is 1.834 kg/L. Determine the mole fraction of phosphoric acid in the tank at 25 minutes.

Answers

Answer:

Mole fraction  = 0.1313

Explanation:

given data

Addition rate of pure phosphoric acid = 30L/min

Phosphoric acid added in 25 min = 750 L

solution

mass is express as here

mass = density × volume and number of moles = mass ÷ molar mass

So, In terms of moles

phosphoric acid added = (750 × 1.834) ÷ 98

phosphoric acid added = 14.036 kmol

and

moles of phosphoric acid in tank = 0.05 × 150 + 14.036

moles of phosphoric acid in tank = 21.536 kmol

and

Moles of water in tank = 0.95 × 150

Moles of water in tank = 142.5 kmol

So that Mole fraction of phosphoric acid in tank

Mole fraction = 21.536 ÷ (21.536+142.5)

Mole fraction  = 0.1313

Sodium benzoate, the sodium salt of benzoic acid, is used as a food preservative. A sample containing solid sodium benzoate mixed with sodium chloride is dissolved in 50.0 mL of .5 M HCl, giving an acidic solution (benzoic acid mixed with HCl ). This mixture is then titrated with .393 M NaOH. After the addition of 46.50 mL of the solution, the pH is found to be 8.2. At this point, the addition of one more drop ( .02 mL) of NaOH raises the pH to 9.3 . Calculate the mass of sodium benzoate (NaC6H5COO) in the original sample. (Hint: At the equivalence point, the total number of moles of acid [here HCl] equals the total number of moles of base [here, both NaOH and NaC6H5COO]

Answers

Answer:

Protegerte Freddy Gerrard Reverte Freddy Buffett irrefutables

Explanation:

Princesa fashion casadas libres

The spot on the fault where the pressure first releases is called the

Answers

Answer:

This movement releases energy and generates seismic waves that can be recorded by specialized instruments used by scientists. The point on a fault at which the first movement or break occurs during an earthquake is called the earthquake's hypocenter

Explanation:

Which of the following is not something that should be considered when creating a debt payment plan?
a. In general, the larger the debt, the longer you should plan to take to pay it off.
b. Higher interest rates create more cost than lower interest rates on a similar debt.
C. Making a payment larger than required or expected will help pay off the debt sooner.
d. The longer you take to pay off your debt, the more you will be paying in interest and other
fees

Answers

Answer:

a. In general, the larger the debt, the longer you should plan to take to pay it off.

When paying off debt consider the interest rates. C., and D. are just facts.

In general, the larger the debt, the longer you should plan to take to pay it off. The correct option is a.

What is debt payment plan?

A debt payment plan is a way to pay off debts gradually. It usually entails consistent payments toward the balance due on each loan.

The total amount of debt, interest rates, minimum payments, and the time frame for repayment should all be taken into account while making a debt payment plan.

You can lower the amount of interest you pay over time by making a payment that is greater than what is required or anticipated in order to assist you pay off the debt sooner.

The longer it takes you to pay off your debt, the more vital it is to bear in mind.

In general, when making a debt payment plan, you shouldn't take into account the fact that the debt will take longer to pay off the larger it is.

Thus, the correct option is a.

For more details regarding payment plan, visit:

https://brainly.com/question/13981679

#SPJ6

What type of element has 8 electrons in their outer most level?
non-metals
metals
noble gases
alkali metals

Answers

Answer:

Noble gases

Explanation:

Neon and argon have 8 electrons in their outermost shells. The elements which have 8 electrons in the outermost shell or in the valence shell,are known as the noble gases.

It's the third one or Noble gases.

HCl (aq) + H2O (l) ⇌ H3O^+ (aq) + Cl^- (aq)
In 1.0 M HCl (aq), is nearly 100 percent dissociated, as represented by the equation above. Which of the following best helps to explain why, in 0.01 M HCN (aq), less than 1 percent of HCN is dissociated?

A. Compared to the HCl (aq) solution, the concentration of the HCN (aq) solution is much too dilute to achieve 100 percent dissociation.

B. The CN^- ion is not very soluble in water, and a solid precipitate would form if more of the HCN dissociated..

C. The equilibrium constant for the dissociation of HCN (aq) is much smaller than that for the dissociation of HCl (aq).

D. HCN (aq) reacts with water to form a basic solution, and the high concentration of OH^- (aq) interferes with the dissociation process.

Answers

There is lesser dissociation of hydrogen cyanide as compared to HCl, as  equilibrium constant for the dissociation of hydrogen cyanide has been smaller than HCl. Hence, option C is correct.

Hydrogen cyanide has been a weak acid that has been dissociated into the constituent ions. The dissociation of the compound in water has been corresponds to the equilibrium constant.

Equilibrium constant for hydrogen cyanide and HCl

The equilibrium constant has been defined as the ratio of the concentration of solute and solvent ions at equilibrium.

The sample with lesser equilibrium constant tends to dissociate at lesser concentration as well.

The equilibrium constant for the dissociation of hydrogen cyanide has been smaller than HCl. Thus, there will be lesser dissociation of hydrogen cyanide as compared to HCl. Hence, option C is correct.

Learn more about equilibrium constant, here:

https://brainly.com/question/17960050

Danielle is designing a system to help race cars slow safely and rapidly at her local racetrack. The racetrack is a straight, 1,000-meter stretch of asphalt. Half of the track is devoted to races and the other half is designed to let cars decelerate after crossing the finish line.

Danielle has designed a pair of small parachutes that are automatically released out the back of a car once it crosses the finish line. When her system works properly, the race car driver does not need to apply the brakes to bring the car to a stop before running out of track.

When Danielle tests a prototype of her design, it brings a race car to a stop 275 meters behind the finish line. After taking some measurements, she decides that her design causes the driver to experience too much force. To correct this, she could
A.
make the parachutes larger in order to increase the drag forces on the car and bring it to a stop 200 meters after crossing the finish line.
B.
add a third parachute in order to increase the drag forces on the car and bring it to a stop 175 meters after crossing the finish line.
C.
make the parachutes smaller in order to decrease the drag forces on the car and bring it to a stop 400 meters after crossing the finish line.
D.
remove one of the parachutes in order to decrease the drag forces on the car and bring it to a stop 550 meters after crossing the finish line.

Answers

Answer:

The answer is C

Explanation:

She should make the parachutes smaller in order to decrease the drag forces on the car and bring it to a stop 400 meters after crossing the finish line.

Determine whether each practice is recommended to keep a micropipette clean and functioning properly.
1. Use a new tip any time you change solutions.
A. Recommended.
B. Not recommended.
2. Turn the micropipette upside down after loading with liquid.
A. Recommended.
B. Not recommended.
3. Save tips after removal to reuse them later.
A. Recommended.
B. Not recommended.
4. Place the micropipette on a rack after using it.
A. Recommended.
B. Not recommended.
5. Place the micropipette on the bench between uses.
A. Recommended.
B. Not recommended.

Answers

Answer:

1. A

2. B

3. B

4. A

5. B

Explanation:

1. Recommended. That way cross-contamination is prevented.

2. Not recommended. The inner mechanism of the micropipette should not come in contact with any liquid whatsoever.

3. Not recommended. It contradicts statement 1.

4. Recommended. That way the micropipette remains completely vertical, minimizing the risks of being decalibrated.

5. Not recommended. If it lays on the bench it will be horizontal, thus contradicting statement 4.

Answer:

1. A

2. B

3. B

4. A

5. B

Explanation:

Many inland areas around Florida contain extinct marine fossils. Which of the following statements best describes how this might have occurred?

Answers

Answer:

D

Explanation:

strong winds carried marine organisms inland where they were buried and fossilized under layer of sediment

Answer:

Strong winds carried marine organisms inland where they were buried and fossilized under layers of sediment.

Explanation:

Question 9 a N20(9) + CO(9) - N2(9) + CO2(9) The rate of the reaction represented above increases significantly in the presence of Pd(s). Which of the following best explains this observation?
А Pd increases the activation energy of the reaction.
B Pd absorbs the heat produced in the reaction. C One of the reactants binds on the surface of Pd, which introduces an alternative reaction pathway with a lower activation energy.
D One of the products binds on the surface of Pd, which increases the reaction rate by decreasing the concentration of products in the mixture.​

Answers

Answer:

Ans choise B

Explanation:

Increasing rates of reaction by catalysts always results because of decrease in activation energy occurs.

i have to match the word lithosphere to life, sky/air, land and water which one?

Answers

Answer:

The answer is air

Explanation:

This is from the web:

"The lithosphere is located below the atmosphere, which is the air that surrounds the planet, and above the asthenosphere."

Hope this helps and answers your question! Have a great day/night!

List out fifteen ways of how you use water in your everyday life

Answers

Answer:

Drinking water

Showering

Brushing your teeth

Cooking

Doing Laundry

Washing your hands

Watering Plants

Cleaning dishes

Recreation; such as swimming pools

Used to grow food

Explanation:

what is used to create motion

Answers

Answer:

These forces make objects change their motion or movement , the act of going from one place to another.

Explanation:

Gold is yellow, shiny, smooth, and is found in the ground. A geologist finds a material that she thinks may be gold. Which of the following tests would reveal that
the material is not gold and not an element?

A. Its density is different from that of gold.
B. Its melting point is different from that of gold.
C. The material is composed of two different substances.
D. Its boiling point differs from that of gold.

Answers

I think the answer is D

The PH of a solution of Hcl is 2.find out the amount of acid present in a litre of the solution ​

Answers

Answer:

The solution is 10^-2 or 0.01M in HCl.

Explanation:

meaning of pH is "power of hydrogen".

what is the molar concentration of a HCl solution with pH=2?

Let say pH=2

[H+]=10^-2M

HCL is a strong acid that dissociates completely:

[H+]=[HCL]

Therefore solution is 10^-2 or 0.01M in HCL.

Please help me answer this I will mark brainliest

Answers

Answer:

A is brain, ND the fact that u don't know this stuff is a lil bit sad, u can so look it

Explanation:

The sum of all the potential energy and kinetic energy is an object is equal to its______

due today pls help! :(

Answers

Answer:

total mechanical energy

Other Questions
The _____ predicts that when someone already enjoys doing an activity, her enjoyment will decrease when she is rewarded for her behavior. flowgorithm based on pseudocode to ask user an age it then displays message if the user's age is greater than 65 (retirement age). It also allows the user to end the program by entering a specific number, a sentinel value and looping structure City center, resort, airport and freeway are all examples of hotels being classified by:_____.a. locationb. pricec. serviced. amenities Which polynomial is a quintic trinomial?A. -x^4-5x^2B. x^3+2x^28x+16C. x + 4D. 3x^5+7x^29x^4 The writer is quoting from the story using more than one source of information. Item5 Item 5 In economic terms, resources that are not being used to satisfy consumer demand Multiple Choice are being conserved. are being wasted. can be used to preserve the environment. can be used for animal welfare. What technique is used in the passage to promote propaganda? what is the purpose of squealers use of propaganda? If a clock on a ship indicates that it is 2:00 P.M. in its home port, while another clock on the ship indicates that it is 12:00 noon at the ship's present location, what is the difference in longitude between the ship's position and its home port The infrastructure master role in active directory is a _____ role In its original meaning, a __________ was a full-scale preliminary drawing executed on paper for projects such as frescoes, stained glass, oil paintings, or tapestries. y square plus 5y equals to 0 what is the domain of f(x)=11-x? if three pies require 2 dozen apples, then four bird require ? dozen apples? A water molecule has the ability to form up to _____ hydrogen bonds with other water molecules Which sentence in this excerpt from President Richard Nixon's speech "The Great Silent Majority" contains the thesis statement? Let us all understand that the question before us is not whether some Americans are for peace and some Americans are against peace. The question at issue is not whether Johnson's war becomes Nixon's war. The great question is: How can we win Americas peace?Well, let us turn now to the fundamental issue: Why and how did the United States become involved in Vietnam in the first place? Fifteen years ago North Vietnam, with the logistical support of Communist China and the Soviet Union, launched a campaign to impose a Communist government on South Vietnam by instigating and supporting a revolution.In response to the request of the Government of South Vietnam, President Eisenhower sent economic aid and military equipment to assist the people of South Vietnam in their efforts to prevent a Communist takeover. Seven years ago, President Kennedy sent 16,000 military personnel to Vietnam as combat advisers. Four years ago, President Johnson sent American combat forces to South Vietnam. The time required to chance a machine from making one product or service to the next is called:______.A) setup time.B) cycle time.C) queue time.D) hold time. SolutionWe can start with the pythagorean theorem:(leg 1)2 + (leg 2) = (hypotenuse)Solve for x.Substitute the values we know.18 + x = 27x=0O The Southern Oscillation is in a negative phase when pressures are: Group of answer choices low in both Tahiti and Darwin equal out in both Tahiti and Darwin higher in Tahiti than in Darwin are higher in Darwin than in Tahiti Informal communication systems skip over hierarchical levels and between departments and functions. They can connect What impact does interest have on the cost of the purchases you make when using credit? OA. Interest has no impact because it is separate from the actual purchase prices. B. Interest can cause the overall cost of your purchases to increase. C. Interest can cause the overall cost of your purchases to decrease. O D. Interest has no impact because most credit cards do not charge interest. SUBMIT