Buffer solution contain weak acid H2PO4- and its conjugate base HPO42-. pH of buffer solution is calculated by using Henderson's equation, pH = pKa + log [conjugate base ] / [ acid ]
pH = pKa + log [HPO42-] / [ H2PO4- ]
pH = 7.198 + log 0.13 / 0.19
pH = 7.198 - 0.165
pH = 7.033
ANSWER : pH of buffer solution = 7.03
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