Question

The pH of a solution decreases by 2.0. How does the hydronium ion concentration of the solution change?

increases to 2 times the original concentration
increases to 100 times the original concentration
decreases to 1/100 of the original concentration
decreases to 1/2 of the original concentration

Answer 1

B, is the answer

Answer 2

Answer: The correct answer is 'increases to 100 times the original concentration'.

Step-by-step explanation:

let the initial pH be x

The original concentration of
`[H^+]` initially present be y

`x=-log[y]`...(1)

Final concentration of
`[H^+]` when pH reduced by 2 be z

`x-2=-log[z]`...(2)

Putting the value of 'x' from (1) into (2) we get :

`-log[y]-2=-log[z]`

`z=10^2y=100y`

When pH of a solution decreases by 2.0, hydronium ion concentration of the solution increases to 100 times the original concentration