Q. 95.0( 3 Votes )
The pH of a solut A. decreases to 1/10 of its original concentration
D. increases by 10 times
As the pH value increases from 0 to 7, it represents a decrease in hydrogen ion concentration in the solution, that is, decrease in the strength of acid. Hence, when the pH = 4.0 is increased to 5.0, there is a decrease to 1/10 of its original concentration.
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