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Determine the pH of a solution that is 0.15 M NaH2PO4 and 0.10 M Na2HPO4 (the...

Determine the pH of a solution that is 0.15 M NaH2PO4 and 0.10 M Na2HPO4 (the Ka for H2PO4- is 6.2 x10^-8). Include a chemical equation showing the relevant equilibrium.

Please show me how you got the answer, I understand how to do single pH calculations but not entirely sure how to do it with two chemicals. Thanks!

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