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A mixture of weak acid is `0.1M` in `HCOOH (K_(a) = 1.8 xx 10^(-4))` and `0.1M` in `HOCN (K_(a) = 3.1 xx 10^(-4))`. Hence, `[H_(3)O^(o+)]` is
A. `7.0 xx 10^(-3)M`
B. `4.1 xx 10^(-4)M`
C. `0.20M`
D. `4.1 xx 10^(-3)M`

1 Answer

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Best answer
Correct Answer - A
Use: `[H^(o+)]_("mix") = sqrt(Sigma K_(ai)C_(i))`
`=sqrt(1.8 xx 10^(-4)xx0.1+3.1xx10^(-4)xx0.1)`
`=sqrt(4.9xx10^(-5)) M = 7 xx 10^(-3)M`

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