Chemistry, 10.07.2019 01:00 kadenh420

What are the concentrations of acetic acid (pka = 4.76) and acetate in a buffer solution of 0.10 m at ph 4.9?

Answers: 2

Show answers

Answers

Answer from: shunna33

Solution:

We have to use the Henderson-Hasselbalch equation: for this calculation

Henderson–Hasselbalch equation describes the derivation of pH as a measure of acidity by using pKa, the negative log of the acid dissociation constant in biological and chemical systems. The equation is also useful for estimating the pH of a buffer solution and finding the equilibrium pH in acid-base reaction.

The equation is given by:

Here, [HA] is the molar concentration of the un dissociated weak acid, [A⁻] is the molar concentration (molarity, M) of this acid's conjugate base and pKa is −log10 Ka where Ka is the acid dissociation constant, that is:

pH = pKa + log([A^-]/[HA])

We look up the pKa for acetic acid:

pKa = 4.76

Let x = molarity of AcO^- and y = molarity of AcOH: Then we have the following two equations in two unknowns:

(1) x + y = 0.10 M

and

(2) 4.9 = 4.76 + log(x/y)

Further calcite the value of x and y by algebraic method and get the answer.

Answer from: raemcbride5678

Solution:

We have to use the Henderson-Hasselbalch equation: for this calculation

The equation is given by:

pH = pKa + log([A^-]/[HA])

We look up the pKa for acetic acid:

pKa = 4.76

Let x = molarity of AcO^- and y = molarity of AcOH: Then we have the following two equations in two unknowns:

(1) x + y = 0.10 M

and

(2) 4.9 = 4.76 + log(x/y)

Further calcite the value of x and y by algebraic method and get the answer.

Answer from: Quest

Exothermic, physical change after it is already baked

Answer from: Quest

explanation:

Other questions on the subject: Chemistry

Chemistry, 22.06.2019 07:20, sarah7307

Describing intermolecular forces use the drop down menus to match the type of intermolecular force to its name dipole dipole interactions dipole induced dipole interactions london dispersion forces hydrogen bond van der waals forces done

Answers: 1

continue

Chemistry, 22.06.2019 12:30, nekathadon

The bond energy for the van der waals bond between two helium atoms is 7.9×10−4ev. assuming that the average kinetic energy of a helium atom is (3/2)kbt, at what temperature is the average kinetic energy equal to the bond energy between two helium atoms

Answers: 1

continue

Chemistry, 23.06.2019 01:00, daniel1480

Which fossil fuel is mainly used for heating and cooking? a. electricity b. coal c. petroleum d. natural gas

Answers: 2

continue

Chemistry, 23.06.2019 03:50, googoo4

Show how to convert the temperature 84.7° c to kelvin. include all steps and label the final answer

Answers: 1

continue

You know the right answer?

What are the concentrations of acetic acid (pka = 4.76) and acetate in a buffer solution of 0.10 m a...