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In a preparation of a buffer, 1.0 L of weak acid solution of phenol HOC6H5 with...

In a preparation of a buffer, 1.0 L of weak acid solution of phenol HOC6H5 with [M] = 0.85 M

was mixed with its phenolic salt NaOC6H5 of [M] = 0.80 M.

(Ka for HOC6H5 = 1.6 X 10-10)

(i)Write equilibrium chemical equation for ionization of HOC6H5 ?

(ii)Write equilibrium chemical equation for hydrolysis of the anion OC6H5 ?

(iii)Calculate the pH of this solution using the Henderson-Hasselbalch equation?

(iv)(a)Calculate the pH after 50 mL of 1.5 M HCl has been added to the original solution.

*Must account to volume change on addition of HCl.

(b)Show direction of the equilibrium in (i) & (ii) after the acid HCl has been added?

(iii)(a)Calculate the pH after another 50 mL of 2.0 M of NaOH has been added to the original

buffer solution.

*Must account to volume change on addition of NaOH.

(b)Show direction of the equilibrium in (i) & (ii) after the base NaOH has been added?

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Show all work. Identify all of the concepts required to solve this problem. Identify the

mathematics required to solve the problem.

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