Question

A solution of ammonia has a pH of 11.8. What is the concentration of OH– ions in the solution?

Answer 1

Answer:

The hydroxide concentration in the solution is 0.0063 M.

Explanation:

The pH of the solution is defined as negative logarithm of $H^+$ concentration.

$pH=-\log[H^+]$

The pH of the ammonia solution is 11.8

pH + pOH = 14

pOH = 14 - 11.8 = 2.2

The pOH of the solution is defined as negative logarithm of hydroxide ion concentration.

$pOH=-\log[OH^-]$

$2.2=-\log[OH^-]$

$[OH^-]=0.0063 M$

The hydroxide concentration in the solution is 0.0063 M.

Answer 2

[OH-]: 0.0063095734448