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  • Solve this problem An aqueous solution contains a substance which yeilds 4x10-3mol/l ion of H3O+.If log 2=0.3010 then PH of the solution is:

An aqueous solution contains a substance which yeilds 4x10-3 mol/l ion of H3O+. If log 2=0.3010 then PH of the solution is:

  • Option 1)

    1.5

  • Option 2)

    2.398

  • Option 3)

    3.0

  • Option 4)

    3.4

 

Answers (1)

best_answer

As learnt in

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

P(H)=-log[H^{+}]

 

 \left [ H^{+} \right ]= 4 \times 10^{-3}\ M

then   pH = -\log \left ( H^{+} \right )

                  = -\log \left ( 4\times 10^{-3} \right )

                  = 3 -2\log 2 = 3-2\times 0.301= 2.398


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

Posted by

prateek

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