Chapter 6, Problem 6A.20E

(a)

Interpretation Introduction

Interpretation:

Molar concentration of hydronium ion has to calculated if the molar concentration of hydroxide ion is $0.0021\text{mol}\cdot {\text{L}}^{-1}$.

Concept Introduction:

Autopyrolysis is a reaction in which proton is transfer from one molecule to another molecule of same kind.  Autopyrolysis constant can be expressed by the equation shown below;

    $K_W=[{\text{H}}_{\text{3}}{\text{O}}^{+}][{\text{OH}}^{-}]$

For pure water the value of autopyrolysis constant is equal to $1.0\times {10}^{-14}$ at $\text{25°C}$.  Unit of autopyrolysis constant is ${\text{mol}}^{\text{2}}\cdot {\text{L}}^{-2}$.  This is because, the unit for concentration of hydroxide ion and hydronium ion is $\text{mol}\cdot {\text{L}}^{-1}$.

(b)

Interpretation Introduction

Interpretation:

Molar concentration of hydronium ion has to calculated if the molar concentration of hydroxide ion is $3.4\times {10}^{-3}\text{mol}\cdot {\text{L}}^{-1}$.

Concept Introduction:

Refer part (a).

(c)

Interpretation Introduction

Interpretation:

Molar concentration of hydronium ion has to calculated if the molar concentration of hydroxide ion is $7.60\text{mmol}\cdot {\text{L}}^{-1}$.

Concept Introduction:

Refer part (a).