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Calculate the approximate pH of 0.1 M aq...

Calculate the approximate pH of 0.1 M aqueous `H_2S` solution. `K_1` and `k_2` for `H_2S` are `1.0 xx 10^(-7)` and `1.3 xx 10^(-13)` respectively at `25^@C`

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pH = 4
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