Question

(a) State the relation between hydrogen ion concentration of an aqueous solution and its pH. (b) The pH of an aqueous solution decreases from 3 to 2. Calculate how many times the hydrogen ion concentration of the solution will change.

Answer 1

pH = - Log [ H+ ] to base 10. Concentration is in Molarity. moles/Liter.

[ H+ ] = 10^(- pH)= 1/10^pH

If pH decreases from 3 to 2, then concentration changes from 0.001M to 0.01M. So it becomes 10 times.