5.00ml of 0.00200M Fe(NO3)3 in 0.10M HNO3 is reacted with 4.00ml of 0.00200M NaSCN in 0.10M HNO3. An additional 1.00ml of 0.10M HNO3 is added to bring the total volume of the solution up to 10.00ml. The solution gave a measured absorbance of 1.0138 on a spectrometer. The calibration curve gave the following equation: A = 7250.1*[FeSCN2+]. Use this data to calculate Kc for the following equation: Fe3+(aq) + SCN-(aq) <=> FeSCN2+(aq).

Answers

Answer 1

The equilibrium constant for the reaction Fe3+(aq) + SCN-(aq) <=> FeSCN2+(aq) is 68.7.

Applying Beer- Lambert law

Applying the Beer-Lambert law, which relates the absorbance of a solution to its concentration and the path length of the sample cell. The law is given by the equation:

A = εbc

In this case, we are given the absorbance (A = 1.0138) and the calibration curve (A = 7250.1*[FeSCN2+]), so we can solve for the concentration of FeSCN2+:

1.0138 = 7250.1*[FeSCN2+]

[FeSCN2+] = 1.398×10^-4 M

Next, we need to determine the initial concentrations of Fe3+ and SCN- before they react. Since both solutions have the same volume and concentration, we can assume that they have the same initial concentration of Fe3+ and SCN-:

[Fe3+]i = [SCN-]i

= 0.00200 M

After the reaction, some of the Fe3+ and SCN- will react to form FeSCN2+. Let x be the concentration of FeSCN2+ formed at equilibrium. The equilibrium concentrations of Fe3+ and SCN- are given by:

[Fe3+]eq = [Fe3+]i - x

[SCN-]eq = [SCN-]i - x

The total volume of the solution after the reaction is 10.00 mL, so the concentrations of Fe(NO3)3 and NaSCN are diluted by a factor of 10/5 = 2. We need to account for this dilution in our calculations. The diluted concentrations are:

[Fe3+]dil = 0.00200 M / 2 = 0.00100 M

[SCN-]dil = 0.00200 M / 2 = 0.00100 M

Substituting the equilibrium concentrations and the molar absorptivity into the Beer-Lambert law, we get:

A = εbc

1.0138 = (7250.1 cm^-1 M^-1) * (0.1 cm) * x

Solving for x,

x = 1.398×10^-5 M

The equilibrium constant, Kc, is given by:

Kc = [FeSCN2+]/([Fe3+]eq[SCN-]eq)

Substituting the equilibrium concentrations and the value of x, we get:

Kc = (1.398×10^-4 M) / ((0.00200 M - 1.398×10^-5 M)(0.00200 M - 1.398×10^-5 M))

Kc = 68.7

Therefore, the equilibrium constant for the reaction Fe3+(aq) + SCN-(aq) <=> FeSCN2+(aq) is 68.7.

Learn more on equilibrium constant here https://brainly.com/question/3159758

#SPJ1


Related Questions

If you have 3 moles of calcium carbonate, how many grams of calcium bicarbonate are formed?

Answers

Answer:

hhjcioz xlioyudiyyxyisrupautwtritu regards Roy

What is the mass of a liquid that has a density of 124 g/mL and takes up a volume of 18 mL. What mass should the liquid have? (round you answer to the nearest hundredth)

Answers

the mass of the liquid should have 69

Nepal is rich in species diversity why?? Explain with any three reason. Help this beginer out !!!​

Answers

Answer:

Nepal is a multilingual, multiethnic, multicultural and multi-religious nation. Unity in diversity is the defining characteristics of Nepali society. Mutual coexistence, tolerance and cooperation have guided the people in achieving social cohesion, peace and happiness.

Explanation:

Please mark as brainliest!

When elements are arranged according to increasing atomic number, there is a repeating, regular pattern of properties
This is called

periodic law

group

periodic table

family

Answers

Answer:

grpup

Explanation:

napagaralan namin yan

Help please!! I'll name you brainliest!!

Answers

Answer:

MgO

Explanation:

dilute hydrochloric acid+zinc metal​

Answers

Explanation:

2HCl+2Zn----> 2ZnCl+H2

Explanation:

HCL + Zn= zncl2 + H2

plz mark my answer as brainlist if you find it useful.

BRAINLIEST IF YOU GET IT!! 5 STARS & A THANK YOU!!
Which of the following is a distinguishing difference between rocks and minerals?
A. Minerals are aggregates of different rocks and elements.
B. Minerals have specific chemical compositions, but rocks do not.
C. Crystals are a type of rock and granite is a type of mineral.
D. Minerals are made of rocks combined in different combinations.

Answers

Answer:

B.

Explanation:

Minerals are formed due to chemical composition by rocks are pressured into their formed from dirt and naturally hard things.

The statement that represents a distinguishing difference between rocks and minerals is as follows:

Minerals have specific chemical compositions, but rocks do not.

Thus, the correct option for this question is B.

What is the difference between rocks and minerals?

A mineral is a naturally occurring substance with distinctive chemical and physical properties, composition, and atomic structure. Rocks are generally made up of two or more minerals, mixed up through geological processes.

Minerals are definitely formed due to chemical composition by rocks being pressured into their formation from dirt and naturally hard things. A rock is an inorganic and a solid naturally-formed substance without any chemical composition or atomic structure.

A mineral is also a solid, inorganic, substance as that like a rock which has a definite crystalline structure as well as chemical composition. Rocks form, break down and move through the rock cycle.

Therefore, the correct option for this question is B.

To learn more about the Rock and minerals, refer to the link:

https://brainly.com/question/15844293

#SPJ2

Elements and compounds are usually more dense in their solid than in their
liquid state. However, water is one of the notable exceptions. The density
of ice is 0.917 g/mL, while the density of liquid water is 1.00 g/mL. What
natural phenomena does this explain?

Answers

Explanation:

The molecules in water is more tightly packed than in ice, so water has greater density than ice.

SCIENCE
What is it called when two or more elements are brought together?

A. Solution.
B. Mixture.
C. Chemical reaction.

Answers

Answer:

C

chemical reaction .

Answer:

C

Explanation:

Chemical reaction.

gases are also good conductors of electricity in discharge tube at
1)high pressure high voltage
2) low pressure low voltage
3) low pressure high voltage
4) never
pls help wil marks as brainliest ​

Answers

Answer:

3)low pressure and high voltage

Does hydrogen have similar physical properties to alkali metals?

Answers

Answer:

YES

Explanation:

because it contain 1 electron in its outermost shell

very urgent
1. Describe an experiment to show the chemical effect of electric current.
2. State three conditions necessary for combustion
3. Describe all that you observe when a piece of iron is placed in copper sulphate solution for a
few minutes.​

Answers

Explanation:

STEP 1- Take two iron nails.

STEP 2- Clean it with sand paper.

STEP 3- Wrap copper wire around both the nails. And connect the other end to the battery terminal.

STEP 4- Take water in beaker and little amount of salt in it or a few drpos of sulphuric acid in it.

STEP 5- Immerse the nails in the solution.

STEP 6- Observe the nails carefully. You can see bubbles of gases coming out from water near nails.

When, electeric current is passed through water gases like hydrogen and oxygen are evolved.

2.Three things are required in proper combination before ignition and combustion can take place---Heat, Oxygen and Fuel. There must be Fuel to burn. There must be Air to supply oxygen. There must be Heat (ignition temperature) to start and continue the combustion process.

When iron is placed in Copper sulphate solution, the iron is coated with a brown coloured substance "copper" and CuSo4 solution changes from blue to light green. This is due to iron displaces copper as it is more reactive than copper.

How many carbon (C) atoms are in CaCO3?​

Answers

Answer:one atom

Explanation:

The carbon symbol is C so only one

Calcium has 1 atom

Oxygen has 3 atoms

Answer:

Only one Carbon atom

Explanation:

CaCO3 is composed of one atom of Calcium, one atom of Carbon and three atoms of oxygen

Which of the following statements is the best example of an interaction between the atmosphere and the hydrosphere ? Done rnnnn

Answers

What are the options for the question

An iron loses electrons. State the type of charge it will end up with


write in your own words

Answers

Answer:

Most atoms do not have eight electrons in their valence electron shell. Some atoms have only a few electrons in their outer shell, while some atoms lack only one or two electrons to have an octet. In cases where an atom has three or fewer valence electrons, the atom may lose those valence electrons quite easily until what remains is a lower shell that contains an octet. Atoms that lose electrons acquire a positive charge as a result because they are left with fewer negatively charged electrons to balance the positive charges of the protons in the nucleus. Positively charged ions are called cations. Most metals become cations when they make ionic

Clear selection
1 point
5. Choose the correct pair to
complete the given statement.
The size of the pupil _ (i) _ in
bright light to allow _ (ii) _ light
to enter our eyes.
O A. (i) increases and (ii) more
B. (i) decreases and (ii) more
O C. (i) increases and (ii) less
O D. (i) decreases and (ii) less
6. Which labelled part gives the 1 poi
human eye, its characteristic
colour
?​

Answers

Answer:

I believe it is d! Reason being, when you cover your eyes with your hands for a period if time, and then move your hands, your pupils become wide, this means that when there is light your pupils are most like decreasing in size and allowing less light! :) hope this helps

Two forms of energy found in all systems are kinetic energy and

Answers

Answer:

Potential energy

Explanation:

Where is the youngest rock in the Atlantic Ocean found?
plz hurry

Answers

Answer:

Seafloor Ages

They found that the youngest rocks on the seafloor were at the mid-ocean ridges. The rocks get older with distance from the ridge crest.

hope this helped

ahh help, is it true or false?

Answers

I think it’s true, false, false

Water often has dissolved gases and other chemicals in it. When this water encounters rocks, the minerals in the rocks can be changed by the process of

Answers

Erosion is the best anwser for that

what is the defination of epsom salt?

Answers

crystals of hydrated magnesium sulfate used as a purgative or for other medicinal use


It on googIe
Hope that helps
epsom salt is a crystals of hydrated magnesium sulphate used as a purgative or for other medicinal use.

MARK ME BRAINLIST

Tammy spent of her savings on a watch. She then spent-of
the remainder on a
.
5
bag. What fraction of her money did she have left?

Answers

Answer:

1 / 2 of her money would be left

Explanation:

Tammy spent 2/5 of her savings on a watch. She then spent 1/6 of the remainder on a bag. What fraction of her money did she have left?

Taking the question bits by bit;

Tammy spent 2/5 of her savings on a watch

Amount Spent = 2/5

Remainder = 1 - 2/5 = 3/5

She then spent 1/6 of the remainder on a bag

Amount Spent = 1/6  *  3/5 = 1/2  *  1/5  = 1 /10

Total amount spent = 2/5 + 1 /10 =   (4 + 1 ) / 10 = 5 / 10 = 1 / 2

Amount left = 1 - 1 /2 = 1 / 2

Consider the data [X] [Y] [Z] initial rate M M M M · s −1 Exp 1 0.30 0.20 0.35 0.210 Exp 2 0.60 0.10 0.70 0.420 Exp 3 0.60 0.20 0.70 0.420 Exp 4 0.60 0.40 0.35 0.105 What is a correct rate law for the reaction?

Answers

Answer:

Rate = k [X]⁻¹ [Z]²

Explanation:

[X] [Y] [Z] initial rate M M M M · s −1

Exp 1 0.30 0.20 0.35      0.210

Exp 2 0.60 0.10 0.70      0.420

Exp 3 0.60 0.20 0.70     0.420

Exp 4 0.60 0.40 0.35      0.105

In Experiment 2 and 3 where the concentrations of Y and Z were constant, doubling the concentration of Y had no effect on the rate of the reaction. This means, that the rate of the reaction is zero order with respect to Y.

In experiment 3 and 4, dividing the concentration of Z by 2, causes the rate of the reaction to decrease by 4. This means the rate of the reaction is second order with respect to Z.

In experiment 1 and 4, doubling the concentration of X, causes the rate of the reaction to decrease by half. This means that X has an order of -1 with respect to the rate of the reaction.

The rate expression is given as;

Rate = k [X]⁻¹[Y]⁰[Z]²

Rate = k [X]⁻¹ [Z]²

HELPPPP I NEED TO SEND THEM TO MY TEACHER ITS REACTIONS AND SOME OF THEM MIGHT CANT HAPPEN

Answers

Answer:

Explanation:

follow the rule of "a weak acid can't make a stronger acid and weak base can't make a stronger base(it's pretty accurate for acid/salt reactions/replacemnts)" the last reactions won't work, but the second to last one will be kbr+pb(no3)2-> kno3 + PbBr2 (this is unballanced.) the first reaction will work. the second one i'm not too sure tbh, but i think it won't work since barium hydroxide's a weak base and if it were to react it would make koh, a super strong base

Answer:

3Ba(OH)2 + 2K3PO4 ----> 6KOH + Ba3(PO4)2

2KBr + Pb(NO3)2  ------> 2KNO3 + PbBr2

H3PO4 + 3KCl -----> K3PO4 + 3HCl

Explanation:

6. El oxígeno gaseoso se calienta a presión constate de 50 °C a 300 K. Se conoce que inicialmente el volumen del sistema era de 1,3 litros. ¿Cuál es el volumen final del sistema?

Answers

Answer:

El volumen final del sistema es 1.2L

Explanation:

La ley de Charles establece que el incremento de la temperatura de un gas produce un incremento en el volumen directamente proporcional cuando la presión permanece constante. La ecuación es:

V₁/T₁ = V₂/T₂

Donde V es volumen y T temperatura absoluta de un gas en 1, el estado inicial y 2, su estado final.

Reemplazando:

V₁ = 1.3L

T₁ = 50°C + 273.15K = 323.15K

V₂ = Incógnita

T₂ = 300K

1.3L/323.15K = V₂/300K

1.2L = V₂

El volumen final del sistema es 1.2L

Which of these is incorrect

Answers

Answer:

B

Explanation:

Ne has 10 electrons.

so the first shell will takes 2 (10-2=8)

the second shell will take 8 (8-8=0)

b would be wrong
bet

What is the answer to the formula 12+6/2+10?
0 25
O 14
O 19
03.6

Answers

The answer was 25

Do according to bodmas rule

Which of the following is considered a dilute solution? Choose all that apply.
Very sweet tea
Contact lens solution
Tide pods (laundry detergent)
Swimming pool water

Answers

Answer:

Very sweet tea

Explanation:

yeah... because sweet tea can cause tooth decay in our mouth thats why...(Please check the other answers also...Its all my point of view....thank you)

How many valence electrons does Oxygen have:
a) 3
b) 5
c) 13

Answers

Answer:

it has 6?

Explanation:

The answer should be 6

Which processes are part of the fast carbon cycle?

Answers

Answer:

Option C

Explanation: Pass me the brainliest I only need 1

Other Questions
Which of the following is not highlighted as a source of switching costs? Leverage and the Cost of Capital. The common stock and debt of Northern Sludge are valued at $70 million and $30 million, respectively. Investors currently require a 16% return on the common stock and an 8% return on the debt. If Northern Sludge issues an additional $10 million of common stock and uses this money to retire debt, what happens to the expected return on the stock? Assume that the change in capital structure does not affect the interest rate on Northern's debt and that there are no taxes. What nuclide is produced in thecore cf acollapsing giant star by eachoftre following reaction? Part 1 Scu-3" B - % 2-{870 Part 2 {zn- 18 = aiGa Part 3 Jisr -& P- %+8 compare and contrast passive solar energy and active solar energy Refer to Exhibit 9-1:n = 36H0: m 20x-bar = 24.6Ha: m > 20s = 12If the test is done at a .05 level of significance, the null hypothesis shoulda.not be rejectedb.be rejectedc.Not enough information is given to answer this question.d.None of the other answers are correct. A 31 year old female complains of diplopia and nausea with vomiting. She has a well-developed goiter and is sweating profusely. Vital signs are BP 132/92, P 104 ... Which energy source has no greenhouse gas emissions but has waste products that present a health hazard for humans? 3agroup of answer choicesgeothermalpetroleumnuclearoil If square HIJK is dilation by a scale factor of 1/3 Which policy is the highest level of policy and is usually created first? standard. GermanNeed to get this done today!!! the premium priced starbucks coffee maybe one example of a relatively price-inelastic product for which..... Developing chick embryos are often used in toxicology studies of endocrine disruptors. If eggs were injected with both ethynyl estradiol and an inhibitor of AMH production throughout the first half of incubation what you expect to see upon examining the reproductive morphology of genetic (ZZ) males and genetic (ZW) females once the chicks hatched. (Explain your answer, 4pts) A pipeline company is designing an undersea pipeline toan off-shore field. It anticipates the possibility that this line could be used in aneighboring field. The design thus calls for a "Y-shaped" layout, where thesingle line from the shore has a branch to the second field. The companycould install the branch now at an extra cost of $18M. fI the oil prices and thequantity of crude justify the full exploitation of the second field, the branchpipeline would be worth $40M. However, there is ac h a n c e , may be 2 in 3,that the oil company would only develop part of the second field, in whichcase the branch pipelinewould worth only $10M.Alternatively, the company could lay a line to a single field, and enable thepossibility of the branch link tothe second field by creating a "T-junction" nithe pipeline. fI the oil companies decide to develop the second field, thepipeline company would then have to pay $20 million to lay the branch line.AL.I. LIBRARYYou may assume for this problem that:-It will take 2 years to know fi the second field wil be developed and thevalue of pipeline;-The pipeline couldbe sold to other companies at the stated values;-The discount rate for the company is 15% annually; and-The risk-free rate is 5% annually.4.1 What kind of option that is available to thesituation? Explain youranswer.4.2 Draw an option payoff diagram for the option in this ventureindicates the value of the exercise price and what is the underlyingasset price in this case.4.3 Calculate the value of the option using the decision tree.4.4 Draw the option tree and find the value of the option using the oneperiod binomial approximation. Why isn't the 5 Karaaks not very important as they were before? The sample has 86.0 g C and 14.0 g H.Mass to Mole: How many moles of Care in 86.0 g C?A. 0.140 molB. 85.1 molC. 7.16 mol the ability to keep information in mind while simultaneously doing another task is Find the values of x for which the series converges. (Give the answer using interval notation.)[infinity]n=0x5n9n Sublimations are generally performed under reduced pressure because:a. the attractive intermolecular interactions between the molecules in the solid get weaker as the pressure is decreased.b. solids do not have a vapor pressure at atmospheric pressure.c. less heat needs to be supplied for the vapor pressure of the solid to equal that of the external pressure.d. solids do not melt when heated under reduced pressure.e. it prevents the pure product getting contaminated with impurities in the air. how much would you have in 4 years if you purchased a $1,000 4-year savings certificate that paid 2ompounded quarterly? (round your answer to the nearest cent.) charges on two isolated bodies are ( 8.4 x 10-19 c) and (14.4 x 10-19 c) respectively. both bodies are combined. the total charge on this body would be