Henderson equation pH & pKa calculation for phosphate buffer solutions applications

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One liter of a buffer solution contains 0.004 mole of acetic acid (pKa = 4.76) and 0.4 mole of sodium acetate. Find the pH.

The pKa values of H3PO4 are 2.12, 7.21, 12.67. The pH of a phosphate buffer containg 0.2M NaH2PO4 & 0.1M Na2HPO4 is
Henderson Equation

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