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quantitative determination of acetylsalicylic acid in aspirin tablets by back titration

1)why do we use a more dilute NaOH solution for the standardization of NaOH?

2)what is the rationale behind the dilution and aliquoting of the aspirin sample?

3)what are the principles behind the use of back titration in the analysis of aspirin tablet?

4)What is the importance of simmering the tablet in the NaOH solution for 20 minutes?

5)What are the possible sources of errors and their effect on calculated parameters?

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