Question 12 Part D Consider the following curve (Figure 1) for the titration of

Question

Question 12 Part D Consider the following curve (Figure 1) for the titration of a weak base with a strong acid and answer each question At what volume of added acid does pH 14 - pKb'? Express your answer using two significant figures mL Figure 1 of 1 14 12 10 Submit My Answers Give Up Part E At what volume of added acid is the pH calculated by working an equilibrium problem based on the concentratio ad Ka of the conjugate acid? 4 Express your answer using two significant figures 0 10 20 30 40 50 mL Volume of acid added (mL) Submit My Answers Give Up

Explanation / Answer

From the figure, equivalence point, V = 22 mL

BOH + H+ --> B+ + H2O

D)

pOH = pKb + log(acid/base) : Buffer solution

pH = 14 - pKb - log(acid/base)

At half the equivalence point when acid/base = 1, pH = 14 - pKb

V = 11 mL

E)

At equivalence point, pH is calculated based on Ka and concentration of conjugate acid.

V = 22 mL

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