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The student plans to make a buffer solution of pH4.00 from a mixture of CH3COOH(aq) andCH3COONa(aq). The student mixes 400cm3 of 0.204moldm−3 CH3COOH(aq) with 600cm3 of CH3COONa(aq). Calculate the concentration of CH3COONa(aq) needed to prepare this buffer solution of pH4.00.ka= 1.78 × 10−5

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