Question

What is the pH of a solution with a 7.8 × 10−13 M hydronium ion concentration?

Answer 1

Answer:

D. 12

Explanation:

The pH is a measure of the acidity of a solution. The pH indicates the concentration of hydronium ions [H3O +] present in a solution;

pH = - log [H3O+]

So

pH= - log [7.8 × 10−13 M]

finally

pH= 12

Answer 2

Answer : The correct option is, (D) 12

Explanation : Given,

Concentration of hydrogen ion = $7.8\times 10^{-13}M$

pH : It is defined as the negative logarithm of hydrogen ion concentration.

Formula used :

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

Now put the value of hydrogen ion concentration, we get the pH of the solution.

$pH=-\log (7.8\times 10^{-13})$

$pH=-\log (7.8)+\log (10^{-13})$

$pH=-0.89+13$

$pH=12.11=12$

Therefore, the pH of the solution is, 12