First slide

PH of strong acids and strong bases

Question

The pH of a solution is 12. Number of H⁺ ions present in 1 ml of this solution at 25⁰C is

Easy

A

6.02 x10²⁰
B

10^-12
C

6.02 x 10⁸
D

10^-2

Solution

[H⁺] = 10^-12
n_H⁺present in 1 ml of solution = 10^-12 x 1 x 10^-3
                                                       = 10^-15
Number of H⁺ ions present in 1 ml of solution
                                                    = 10^-15 x 6.023 x 10²³
               = 6.023 x 10⁸

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