Chapter 13, Problem 6RQ

Interpretation Introduction

Interpretation: The technique for calculating the $\text{pH}$ of a strong base in water, difficulty in calculation of $\text{pH}$ of ${\text{Ca(OH)}}_2$, $\text{pH}$ of a weak base in water, $\pm 5\%$ rule failure alternative, element responsible for the basic properties  is to be stated.

Concept introduction: The $\text{pH}$ of strong bases is calculated directly by finding out the major species. The $\text{pH}$ of weak bases are calculated by considering the change in initial concentration at equilibrium. The $\pm 5\%$ rule is valid only when the difference between initial and equilibrium concentration is less than $\pm 5\%$.