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Which will make basic buffer? 

(1) 50 mL of 0.1 M NaOH + 25 mL of 0.1 M CH3COOH 

(2) 100 mL of 0.1 M CH3COOH + 100 mL of 0.1 M NaOH 

(3) 100 mL of 0.1 M HCl + 200 mL of 0.1 M NH4OH 

(4) 100 mL of 0.1 M HCl + 100 mL of 0.1 M NaOH

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Equilibrium, buffer solutions

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