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Two weak monobasic organic acids HA and ...

Two weak monobasic organic acids `HA` and `HB` have dissociation constans as `3.0 xx 10^(-5)` and `1.5 xx 10^(-5)`, respectively, at `25^(@)C`. If `500mL` of `1M` solutions of each of these two acids are mixed top product `1L` of mixed acid solution, what iws the `pH` of the resulting solutions?

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