In titration 1, to determine M ASA, you weigh out 266.0 mg of pure aspirin (ASA)

Question

In titration 1, to determine M ASA, you weigh out 266.0 mg of pure aspirin (ASA) on the analytical balance. After dissolving this mass in ethanol and water, you titrate the solution with the KOH to the phenolpthaline equivalence point. Subtracting the initial buret reading from the final one, you find that the amount of KOH consumed is equal to 24.32 mL. Based on this titration, what is the value of MASA (mg / mmol )? Enter a numeric answer to the correct number of significant figures. Do not include units in your answer.

Explanation / Answer

ASA molar mass = 180.157g/mol = 180.157mg/mmol

you have 266mg of ASA, so if 180.157mg are present in 1 mmol, then 266mg are content in 1.48mmol

you will need 1.48mmol of KOH.

266mg/1.48mmol=179.73mg/mmol

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