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A 0.540 M Nitrous Acid (HNO2) solution has been mixed with 0.050 M NaCl. What will...

A 0.540 M Nitrous Acid (HNO2) solution has been mixed with 0.050 M NaCl. What will be the hydronium ion concentration of this solution? The activity coefficients for H3O+ and NO2− are 0.86 and 0.80 respectively. The Ka for Nitrous Acid is 5.10000E-4.

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Answer #1

NaCl + HNO2 NaNO2 + HCl

The ionic equation is
Na+(aq) + Cl-(aq) + HNO2(aq) Na+(aq) + NO2-(aq) + H+(aq) + Cl-(aq)
The net ionic equation is
HNO2(aq) H+(aq) + NO2-(aq)          [H+] = [H3O+]

Ka = [NO2-][H3O+]/[HNO2]

5.1 10-4 = (0.80)[H3O+]/(0.540)

[H3O+] = 3.44 10-4 M

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