Question

A solution of HCl has a concentration of 1.20 x 10-2 M. What is the pH of this solution?

Answer 1

Answer: The pH of the solution is 1.92

Explanation:

To calculate the pH of the solution, we use the equation:

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

We are given:

Hydrochloric acid is a monoprotic acid and it dissociates 1 mole of hydrogen ions. So, the concentration of hydrogen ions is $1.20\times 10^{-2}M$

$[H^+]=1.20\times 10^{-2}M$

Putting values in above equation, we get:

$pH=-\log(1.20\times 10^{-2})\\\\pH=1.92$

Hence, the pH of the solution is 1.92

Answer 2

-log (1.2x10^-2) = 1.92 so C