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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
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+].
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