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pH of buffer when 0.2mmol of HCl is added. 5.0 pH buffer, made from sodium acetate....

pH of buffer when 0.2mmol of HCl is added. 5.0 pH buffer, made from sodium acetate. 6.454mmol of weak base(CH3COO-), and 3.546mmol of conjugate acid(Ch3COOH). pKa = 4.74 since Ka of sodium acetate is 1.8*10^-5

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