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The p(H) scale -

Hydronium ion concentration in molarity is more conveniently expressed on a logarithmic scale known as p(H) scale.

- wherein

The p(H) of a solution is defined as negative logarithm to base 10 of the activity of hydrogen ion

then

Option 1)

1.5

This answer is incorrect

Option 2)

2.398

This answer is correct

Option 3)

3.0

This answer is incorrect

Option 4)

3.4

This answer is incorrect

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