When the pH of a solution is changed from 4 to 3,

the hydronium ion concentration of the solution:

(1) decreases by a factor of 10

(2) increases by a factor of 10

(3) decreases by a factor of 100

(4) increases by a factor of 100


and why?

Verified Answer :

The correct answer is option 2. When the pH of a solution is changed from 4 to 3, the hydronium ions increases by a factor of 10.  pH is a scale used to measure the acidity or
alkalinity of an aqueous solution. It can be used to calculate the amount of
hydronium ions in the solution. It is expressed as: pH = -log [H+].