Question

What is the [H3O+] in a solution with [OH-] = 1.0 x 10-12 M?

1.0 x 10-2 M

1.0 x 10-8M

1.0 x 10-12M

1.0 x 102 M

Answer 1

Answer:

The concentration of hydronium ions in the solution is $1.0\times 10^{-2}$M.

Explanation:

Concentration of hydroxide ions concentration = $[OH^-]=1.0\times 10^{-12} M$

The pOH if the solution is given by :

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

$pOH=-\log[1.0\times 10^{-12} M}]$

pOH = 12

The relation between pH and OH is given by : pH + pOH = 14

pH = 14 - pOH

pH =14 - 12 = 2

The pH of the solution isgiven by :

$pH=-\log[H_3O^+]$

$2=-\log[H_3O^+]$

$[H_3O^+]=1.0\times 10^{-2} M$

The concentration of hydronium ions in the solution is $1.0\times 10^{-2}$M.