Question

At 25°C a solution has a hydroxide-ion concentration of 8.22 x 10-5 M. What is its hydronium-ion concentration? a. 8.22 * 10-19 M 6.100 10-14 M M d. 1.00 10 -7 M e. 1.22 M C. 8.22 x 10-5 10-10

Answer 1

The correct answer is option e that is $1.22\times 10^{-10}\; M$

EXPLANATION:

Given:

$[OH^-]=8.22\times 10^{-5} \; M$

Now at 25°C ,

$[H_3O^+][OH^-]=1\times 10^{-14}$

1 x 10-14 [H3O+]= OH-]

$[H_3O^+]=\frac{1\times 10^{-14}}{8.22\times 10^{-5}}$

$[H_3O^+]=1.22\times 10^{-10} \; M$

Hence , option e is correct