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

Question

asked Jul 28, 2019 115k views

2 Answers

Long Short · Answer 1 · 2019-08-02T12:32:44+0000

Answer:

The hydroxide concentration in the solution is 0.0063 M.

Step-by-step 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.