Question

Beer has a pH of 3, therefore its H⁺ concentration is ____________ times greater than a solution with a pH of 5.

Answer 1

H+ conc = antilog to negative pH
H+ conc of pH 3 = 1 x 10^-3 M

One unit pH change of the H+ concentration is by a factor of 10. Since pH 3 to pH 5 is 2 unit changes, pH 3 then has one hundred times more H+ concentration than a pH of pH 5.