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A 3 g sample of activated charcoal is mixed with 50 mL of 0.06 N acetic acid solution in a flask. After keeping it for one hour, the mixture is filtered and the normality of the filtrate is found to be 0.042 N. What mass of acetic acid is adsorbed per gram of charcoal?

1. 42 mg
2. 54 mg
3. 18 mg
4. 36 mg

Correct answer: 18 mg

Solution

Acetic acid adsorbed = (0.06 - 0.042) N * 0.050 L = 0.0009 mol = 0.0009*60 = 0.054 g = 54 mg total. Per gram of charcoal = 54/3 = 18 mg.

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