Question

calculate the pH of a solution whose H3O+ ion concentration is 2.5× 10^-4 M

Answer 1

To calculate the pH of any solution, use the formula;

pH= -log[ concentration ] and for this case take pH= -log[H3O+]

= -log[2.5x10^-4]

therefore pH= 3.60

The idea of pH mainly applies in the determination of the nature of various solutions to the used in the chemical analysis. The correct pH must be determined in order to get accurate results. Ionic equillibria mostly involves the calculations involving pH which is normally obtained after determination of equilibrium concentrations.

Answer 2

We know that pH is defined as the negative logarithm of H3O+ concentration,

pH = - log(H3O+) concentration,

hence, pH = - log(2.5x10^-4)

= - log (0.00025)

= 3.602