Question

If the pH of a somewhat dilute (i.e. ~0.08 to 0.10 M) aqueous solution of HCl is 1.14, then to a good approximation, what is the concentration of hydrogen ions in this solution? Enter your answer to the nearest hundredth.

Answer 1

Answer:

The concentration of hydrogen ions is 0.07 M

Explanation:

HCl is a strong acid. When it dissolves in water, it dissociates completely in H⁺ and Cl⁻ ions.

From the definition of pH:

pH = - log [H⁺]  

We introduce the pH of the solution (1.14) and calculate the concentration of hydrogen ions ([H⁺]) in M :

[H⁺] = $10^{-pH}$= $10^{-1.14}$= 0.0724 M= 0.07 M