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Answer to Question #17950 in Inorganic Chemistry for anahita younesi

Question #17950
what volume of HCL 0.2 molar should add to 250 mlit sodium mandelat 0.3 and finally they made a bafer soloution with PH 3.37
Expert's answer

pH = pKa + lg (C salt * V salt / C acid * V acid)
3.37 = 3.41 + lg (0.25*0.3 / 0.2*V acid)
-0.04 = lg (0.25*0.3 / 0.2*V acid)
0.25*0.3 / 0.2*V acid = 0.912
V acid = 0.411 L
V acid = 411 ml

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Assignment Expert
19.11.12, 14:13

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anahita younesi
18.11.12, 20:19

thanks for your answer.

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