Chapter 16, Problem 8SAQ

Interpretation Introduction

Interpretation:

The option corresponding to the correct value of $\text{pH}$ at equivalence point for the titration between $10.0\text{mL}$ of $\text{0}\text{.200}\text{M}$$\text{HCN}$ and $0.0998\text{M}$$\text{NaOH}$ is to be identified.

Concept introduction: An equivalence point in the acid-base titration indicates that the moles of an acid are equal to the moles of a base.

The relation between conjugate acid-base pairs is expressed by the equation,
  $K_{\text{a}}\cdot K_{\text{b}}=K_{\text{w}}$

To determine: The option corresponding to the correct value of $\text{pH}$ at equivalence point for the titration between $10.0\text{mL}$ of $\text{0}\text{.200}\text{M}$$\text{HCN}$ and $0.0998\text{M}$$\text{NaOH}$ .

Correct answer:

The option (d) is correct.