The pH of the solution in which one normal adult dose aspirin is dissolved is : 2.7
Given data :
mass of aspirin = 640 mg = 0.640 g
volume of water = 10 ounces = 0.295735 L
molar mass of aspirin = 180.16 g/mol
moles of aspirin = mass / molar mass = 0.00355 mol
Determine the pH of the solutionFirst step : calculate the concentration of aspirin
= moles of Aspirin / volume of water
= 0.00355 / 0.295735
= 0.012 M
Given that pKa of Aspirin = 3.5
pKa = -logKa
therefore ; Ka = [tex]10^{-3.5}[/tex] = [tex]3.162 * 10^{-4}[/tex]
From the Ice table
[tex]3.162 * 10^{-4}[/tex] = [tex]\frac{x + H^+}{[aspirin]}[/tex] = [tex]\frac{x^{2} }{0.012-x}[/tex]
given that the value of Ka is small we will ignore -x
x² = [tex]3.162 * 10^{-4} * 0.012[/tex]
x = [tex]1.948 * 10^{-3}[/tex]
Therefore
[ H⁺ ] = [tex]1.948 * 10^{-3}[/tex]
given that
pH = - Log [ H⁺ ]
= - ( -3 + log 1.948 )
= 2.71 ≈ 2.7
Hence we can conclude that The pH of the solution in which one normal adult dose aspirin is dissolved is : 2.7
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What is the position of the dog
Answer:
what dog
Explanation:
you did not show a dog
The enthalpy of reaction for the combustion of C to produce CO2(g) is -393.5 kJ/mol and the
enthalpy of the reaction of CO to produce CO2 is -283.0 kJ/mol as shown in the reactions:
(1) C(S) + O2(g) CO2(g) H=-393.5 kJ
(2) CO(g) + 1/2O2(g) CO2(g) H=-283.0 kJ
Based on these data, calculate the enthalpy of combustion of C to produce CO:
(3) C(S) + 1/2O2(g) CO(g) H=?
The enthalpy of combustion of C to produce is mathematically given as
dHo rxn = -110.5 KJ
What is the enthalpy of combustion of C to produce?
Question Parameters:
the combustion of C to produce CO2(g) is -393.5 kJ/mol
the reaction of CO to produce CO2 is -283.0 kJ/mol
The Hess lawHess's law states that during a chemical reaction any change in the enthalpy of a chemical reaction is identical nonetheless, not regarding if the reaction takes place in one step or several steps, so far we have similar final and the initial states.
Generally, the equation for the reaction 3 is mathematically given as
reaction 3 = +1 * (reaction 1) -1 * (reaction 2)
Therefore
dHo rxn = +1 * (-393.5) -1 * (-283.0)
dHo rxn = -110.5 KJ
In conclusion, the enthalpy of combustion is
dHo rxn = -110.5 KJ
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Calculate the pH when 60.0 mL of 0.200 M HBr is mixed with 30.0 mL of 0.400 M CH₃NH₂ (Kb = 4.4 × 10⁻⁴).
When a volume of 60.0 mL of 0.200 M HBr is mixed with a volume of 30.0 mL of 0.400 M CH3NH2, The pH value is mathematically given as
pH=10.64
What is the pH value when 60.0 mL of 0.200 M HBr is mixed with 30.0 mL of 0.400 M CH₃NH₂?Question Parameters:
The pH when 60.0 mL of 0.200 M HBr
30.0 mL of 0.400 M CH₃NH₂ (Kb = 4.4 × 10^{-4}).
Generally, the equation for the Chemical Reaction is mathematically given as
H Br + H_3C NH_2----- > CH_3 NH_3 Br
Therefore
oH=p^{kb}+-log[tex]\frac{salt}{base}[/tex]
OH=-log(4.4*10^{-4})+[tex]\frac{0.1}{0.1}[/tex]
OH=3.36
In conclusion, The equation pH value
pH+OH=14
Therefore
pH+=14-3.36
pH=10.64
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Determine the volume in mL of 0.242 M NaOH(aq) needed to reach the equivalence (stoichiometric) point in the titration of 46.79 mL of 0.204 M propanoic acid(aq). The Ka of propanoic acid is 1.3 x 10-5.
The volume (in mL) of 0.242 M NaOH solution needed for the titration reaction is 39.44 mL
Balanced equationCH₃CH₂COOH + NaOH —> CH₃CH₂COONa + H₂O
From the balanced equation above,
The mole ratio of the acid, CH₃CH₂COOH (nA) = 1The mole ratio of the base, NaOH (nB) = 1How to determine the volume of NaOHVolume of acid, CH₃CH₂COOH (Va) = 46.79 mL Molarity of acid, CH₃CH₂COOH (Ma) = 0.204 MMolarity of base, NaOH (Mb) = 0.242 MVolume of base, KOH (Vb) =?MaVa / MbVb = nA / nB
(0.204 × 46.79) / (0.242 × Vb) = 1
Cross multiply
0.242 × Vb = 0.204 × 46.79
Divide both side by 0.242
Vb = (0.204 × 46.79) / 0.242
Vb = 39.44 mL
Thus, the volume of NaOH needed for the reaction is 39.44 mL
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Does doubling the temperature for a reaction cut the activation enegry in half?
In general, if you double the temperature you double the reaction rate. However, this does not mean the activation energy is cut in half
What are the intermolecular forces present in acetone?.
Answer:
dipole-dipole forces will be present.
Explanation:
dipole will be present because Water has a dipole and can also hydrogen bond, as can isobutyl alcohol.
Which is a major environmental concern for our oceans?
Question 5 options:
oxygen pollution
plastic pollution
nutrient pollution
air pollution
Element “X” is a brand new element. Scientists discovered that 80% of the atoms of element
“X” have a mass number of 10 amu and the other 20% have a mass of 11 amu. What is the avg.
atomic mass of element "X"?
Answer:
Average atomic mass of X is 10.2 amu.
Explanation:
Given data:
Percentage abundance of X-10 = 80%
Percentage abundance of X-11 = 20%
Average atomic mass of X = ?
Solution:
Average atomic mass of X = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) / 100
Average atomic mass of \X = (80×10)+(20×11) /100
Average atomic mass of X = 800 + 220 / 100
Average atomic mass of \X = 1020 / 100
Average atomic mass of X = 10.2 amu
When an experimenter draws a conclusion that he assumes will apply to all situations set up similarly to his test situation, even though he cannot possibly have examined all possible test scenarios, the experimenter is using _____.
a) inductive reasoning
b) abductive reasoning
c) deductive reasoning
d) subjective reasoning
Answer: A, inductive Reasoning
Explanation: I got the answer right on my homeschooling program, the rest are all wrong
WILL GIVE BRAINLIEST
which statement describes all chemical changes but not physical changes
Answer:
answer is b
Explanation:
how does crushing affect solubility
Answer:
I think crushing affect solubility in that it increases the surface area of the solute in contact with the solvent
a person stretches a spring apart in their figures and holds it there, not moving this is an exmple of?
A.Potential energy turning into kinetic energy
B. Someone creating energy
C. Someone destroying energy
D. Kinetic energy turning into potential energy
Answer:
pretty sure D is the right answer
Explanation:
kinetic energy is energy of motion, potential is energy that is stored
Jerry pushes a 3.2 kg box with an acceleration of 5.6 m/s^2.what is the resultant force?
Answer:
1.5 N, mass m= 3.2 kg. F = m * a. 1.5 = 3.2 * a
Explanation:
5. What is total number of heat energy required to completely boil 100.0 g of water at 100.0
°C and 1 atm?
Need help this one is due 11:59 tonight
Answer:4.2J/(g.°c)
I hope this helps
Explanation:
A hydrogen-like ion is an ion containing only one electron. The energy of the electron in a hydrogen-like ion is given by:
En = −(2.18 × 10^−18J) Z^2 ( 1/n^2 )
where n is the principal quantum number and Z is the atomic number of the element. Plasma is a state of matter consisting of positive gaseous ions and electrons. In the plasma state, a mercury atom could be stripped of its 80 electrons and therefore could exist as Hg80+. Use the equation above to calculate the energy required for the last ionization step.
hydrogen-like ion is an ion containing only one electron. The energy of the electron in a hydrogen-like ion is given by:
En = −(2.18 × 10^−18J) Z^2 ( 1/n^2 )
where n is the principal quantum number and Z is the atomic number of the element. Plasma is a state of matter consisting of positive gaseous ions and electrons. In the plasma state, a mercury atom could be stripped of its 80 electrons and therefore could exist as Hg80+. Use the equation above to calculate the energy required for the last ionization step.hydrogen-like ion is an ion containing only one electron. The energy of the electron in a hydrogen-like ion is given by:
En = −(2.18 × 10^−18J) Z^2 ( 1/n^2 )
where n is the principal quantum number and Z is the atomic number of the element. Plasma is a state of matter consisting of positive gaseous ions and electrons. In the plasma state, a mercury atom could be stripped of its 80 electrons and therefore could exist as Hg80+. Use the equation above to calculate the energy required for the last ionization step.hydrogen-like ion is an ion containing only one electron. The energy of the electron in a hydrogen-like ion is given by:
En = −(2.18 × 10^−18J) Z^2 ( 1/n^2 )
where n is the principal quantum number and Z is the atomic number of the element. Plasma is a state of matter consisting of positive gaseous ions and electrons. In the plasma state, a mercury atom could be stripped of its 80 electrons and therefore could exist as Hg80+. Use the equation above to calculate the energy required for the last ionization step.
please mark me as brainliest............
follow me..........
How many atoms are in 3.5 L of Neon at STP? Show your work!
Answer:
the answer to the question is 0.1734
Explanation:
3.5g=1mole of Ne/20.18g
=0.1734
Which method is the best way to separate a mixture of recycled glass and iron
Answer:
Use a magnet
Explanation:
Magnet will pull out the iron and the glass will remiain there
Answer: Sorting by magnetism
Explanation: quiz
What 2 locations have the greatest kinetic energy
Answer:
what??? Is this the complete quetion??
What is the compound name of CrS3?
Answer:
Chromium (VI) sulfide
Explanation:
It is an ionic bond, hence the roman numeral.
Which of the following does not describe an object with high
elasticity?
a
A piece of paper that rips after pulling on it.
b A spring that easily compresses when pushed.
A slinky that expands and contracts when held at
one end.
d A rubber band that stretches when you pull on it.
Chockit
Answer:
Explanation:
C
A hydrogen atom absorbs a photon of visible light and its electron enters the n = 4 energy level. Calculate the change in energy of the atom and the wavelength (nm) of the photon.
What happens to the rate of reaction as the reactants get used up in a reaction?
Answer:So, when a reactant gets used up, its concentration decreases, and so the total reaction rate decreases. As you can see here, more products equal less reagents (reactants), and so the reaction rate decreases.
Explanation: i hope this helps!! :)))
ASAP HELP ME!! Which of the following does the ocean provide?
Question 1 options:
Over half the oxygen we breathe
Climate regulation
Pollution
Food and medicine
The oceans are fundamental because provide oxygen, climate regulation, and food and medicines.
What are ocean resources?The term ocean resources make reference to the sources of energy and materials obtained from the ocean.
The ocean produces more than 50% oxygen we can breathe from the air and also absorbs carbon dioxide.
The ocean is also fundamental in climate regulation to dissipate heat from the equator to the North and South poles.
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What is most plastic made of?
A) synthetic materials
B) carbon containing compounds
C) inorganic compounds
D) organic compounds
E) petroleum or coal materials
Consider the statement below.
“When nitrogen is liquefied, heat is released.”
Is this statement true or false?
It is false because nitrogen absorbs heat when it is liquefied.
It is false because nitrogen cannot absorb enough heat to liquefy.
It is true because heat is released when a gas changes to a liquid.
It is true because heat is released when a liquid changes to a gas.
The statement, that describes when nitrogen is liquefied, heat is released is "it is true because heat is released when a gas changes to a liquid."
What is heat released?Heat is used to release energy in some chemical reactions. In other words, they radiate heat into the environment.
The energy generated when a gas condenses to a liquid is known as latent heat of condensation. Condensation is the transformation of a gas into a liquid.
When steam is cooled, it releases thermal energy and transforms into a liquid. This is known as condensation.
Heat must be removed in the given statement to transform gaseous nitrogen to liquid nitrogen.
Hence the correct option is C.
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Determine the amount of moles of SiO2 needed to produce 4.80g of CO.
SiO2(s) + _C(s) — _SiC(s) + I co(g)
A)134 mol
B)0.171 mol
C)67.2 mol
D) 0.0857 mol
Which change of state involves a release of energy?
boiling
condensation
melting
sublimation
Answer:Condensation
Explanation:I just took it:/
The phase changes occur when the substances undergoes transition between different states of matter. All phase changes involve either gain or release of energy. Here condensation involves a release of energy. The correct option is B.
What is condensation?The process through which the physical state of matter changes from the gaseous phase into the liquid phase is defined as the condensation. The condensation occurs when water vapor in the air changes into liquid water when it comes in contact with a cooler surface.
During condensation molecules in the gaseous state release energy to change state to a liquid. The opposite of the condensation is the evaporation. At high pressure and low temperature any gas can condense.
Condensation is also important to the water cycle as it is responsible for the formation of clouds and maintains water balance.
Thus the correct option is B.
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what is the mass of fructose also known as fruit sugar (c6h12o6) in a 1.38×10^2ml sample of glucose solution that has a concentration of a 1.04m
Answer:
its 1.04
Explanation:
When a liquid becomes a gas the process is called
Answer:
Evaporation
Explanation:
Evaporation is a process of water changing into vapor when heated.
The process is called evaporation
What are the advantages of using moringa in water purification?
Nonsense = report
Best answer = brainliest
Answer:
moringa tree has seeds that have unique properties towards water purification
Explanation:
the seeds of moringa tree have an extract which can separate unwanted particulates from the water sediment impurities.
they have the
anti-microbial treatment potentials
moringa also has various vitamins since it is a plant tissue