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Mixture of solutions. Calculate the pH o...

Mixture of solutions. Calculate the pH of the following solutions. `K_1= 7.5 xx 10^(-3) M, K_2= 6.2 xx 10^(-8)M , K_3 =1.0 xx 10^(-12)M`
40 ml of 0.10 M `H_3PO_4` + 40 ml of 0.25 M NaOH.

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