determine the pH of a solution that is 0.15M NaH2PO4 and 0.10M Na2HPO4 (the Ka f

Question

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

Explanation / Answer

first convert the Ka in to pKa

pKa = -log(Ka) = -log(6.2 x 10-8) = 7.2

now use the hander son equation

pH = pKa + log (Na2HPO4 / NaH2PO4)

pH = 7.2 + log(0.1/0.15)

pH = 7.2 + (-0.176)

pH = 7.02

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