47 When the pH of an aqueous solution is changed from 1 to 2, the concentration of hydronium ions in the solution is(1) decreased by a factor of 2
(2) decreased by a factor of 10
(3) increased by a factor of 2
(4) increased by a factor or 10
The answer is (2) decreased by a factor of 10. The relationship between pH and concentration of hydronium ions is pH=-lg[H+]. So pH increase because of concentration of H+ decrease.
