Consider the following curve (Figure 1) for the titration of a weak base with a

ID: 1051027 • Letter: C

Question

Consider the following curve (Figure 1) for the titration of a weak base with a strong acid and answer each of the following questions.

Part A

What is the pH at the equivalence point?

Express your answer as a whole number.

Part B

What is the volume of added acid at the equivalence point?

Part C

At what volume of added acid is the pH calculated by working an equilibrium problem based on the initial concentration and Kb of the weak base?

Part D

At what volume of added acid does pH=14pKb?

Part E

At what volume of added acid is the pH calculated by working an equilibrium problem based on the concentration and Ka of the conjugate acid?

Express your answer using two significant figures.

Titration curve

From the curve

Part A) pH at the equivalence point = 5.8

Part B) Volume of acid added at the equivalence point = 25 ml

Part C) at volume of acid added = 0 ml, pH is calculated by using Kb and initial concentration of base

Part D) volume of acid added when pH = 12.5 ml

Part E) volume of acid when pH is calculated by using Ka and concentration of conjugate acid = 25.50 ml

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