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The pH of a solution is 5.0. To this solution sufficient acid is added to decreases the pH to 2.0. The no. of times the concentration of H + increased is

Correct answer

1000

Step-by-step solution

H 3 O + before the addition of acid is [ H 2 O + ] i n i t i a l = 1 0 - p H = 1 0 - 5 M [ H 3 O + ] f i n a l = 1 0 - 2 M So [ H 3 O + ] f i n a l [ H 3 O + ] i n i t i a l = 1 0 - 2 M 1 0 - 5 M = 1000 times

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