Question

In a solution of pH = 5, more acid is added in order to reduce the pH = 2. The increase in hydrogen ion concentration is
(1) 100 times
(2) 1000 times
(3) 3 times
(4) 5 times

Answer 1

1000 times because 10 times decrease by one unit if we add 1000 times it decreases by another 2unit so pH becomes 2