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Calculate pH of a 0.1 M Na_2 HPO_4solution. K_1 , K_2and K_3for H_3PO_4 are 7.1 xx 10^(-3), 6.3 xx 10^(-6)and 4.5 xx 10^(-13) respectively. Which approximation is necessary for the calculation? |
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Answer» Solution : As `K_3` for `H_3PO_4` is very LOW compared to `K_1`assume no acidic ionisation. CONSIDER only the equilibrium, `HPO_4^(2-) + H_2O IFF H_2PO_4^(-) + OH^-` (10,10) |
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