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0.20 g of NaOH is dissolved per litre of...

0.20 g of NaOH is dissolved per litre of a caustic soda solution. If 12.5mL 0.1(N) ``H_2SO_4` solution is added to 250 mL of that caustic soda solution, then what will be the pH of the mixed solution?

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`pH=pK_a+log([CH_3COONa])/([CH_3COOH])=4.74+log(0.1)/(0.2)=4.4`
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