Question

A solution of ammonia has a pH of 11.8. What is the concentration of OH– ions in the solution? Useful formulas include , , , and . 1.58 10–12 M 6.31 10–3 M 2.20 M 158 M

Answer 1

The concentration of OH- ions = 6.31*10⁻³M

Step-by-step explanation:

Given:

pH of ammonia solution = 11.8

Formula:

`pH + pOH = 14\\\\pOH = 14-pH = 14 - 11.8 = 2.2\\\\pOH = -log[OH-]\\`

`[OH-] = 10^(-pOH ) = 10^(-2.2)  = 6.31*10^(-3) M`