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A 0.495 M solution of nitrous acid, HNO2, has a pH of 1.83.a. Find the [H+] and the...

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lak-86 | Student, Undergraduate | Salutatorian

Posted July 3, 2013 at 12:06 PM via web

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A 0.495 M solution of nitrous acid, HNO2, has a pH of 1.83.
a. Find the [H+] and the percent ionization of nitrous acid in this solution.


 

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jeew-m | College Teacher | (Level 1) Educator Emeritus

Posted July 3, 2013 at 12:15 PM (Answer #1)

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`HNO_2 harr H^++NO_2^-`

Since `HNO_2` is not a strong acid it's ionization is not complete. So in the final mixture we have both `H^+` and `HNO_2` .

We know that;

`P_H = -log[H^+]`

`1.83 = -log[H^+]`

`[H^+] = 10^(-1.83)`

`[H^+] = 0.0148M`

So the concentration of `H^+` is 0.0148M.

 

We had 0.495M `HNO_2` solution. But only 0.0148M has ionized.

% of ionization `= (0.0148/0.495)xx100% = 29.9%`

 

So the percentage ionization of `HNO_2` is 29.9%.

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