An aspirin tablet weighing 0.548 g has been analyzed and contains68.2 % ASA (180.16 g/mol) by mass. A student dissolved
the tablet in hot NaOH and the cooled solution was diluted with DIwater to the mark in a 250 mL volumetric flask. Exactly 3.00mL
of the solution was pipetted into a 100 mL volumetric flask anddiluted to the mark with FeCl3 solution.
The concentration of the diluted solution is

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Casey DurganLv2

23 Nov 2019

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1.250 g mass of standard aspirin is dissolved in approximately20 mL of 1 M NaOH. This solution is
added to a 250-mL volumetric flask and diluted to the mark with DIwater. How many grams per mL of
aspirin are in the resulting solution. (Note a 250-mL volumetricflask has a precision of 0.01 mL and
the amount of NaOH added has no bearing on the significant figuresin the final concentration).

A 0.300 g sample of an aspirin tablet is used to prepare 100.0 mL of a stock solution by dissolving the tablet in 1 M NaOH then diluting with distilled water to the 100 mL mark of a volumetric flask. A 0.30 mL sample of the stock solution is then transferred to a volumetric flask and diluted with 0.02 M iron(III) chloride to the 10.00 mL mark. The tetraaquasalicylatoiron(III) complex concentration in this 10.00 mL sample is determined to be 4.3x10^-4M. What is the percentage of acetylsalicylic acid in the original aspirin tablet? Do not include the % sign in your answer. For example, for a value of 100% enter 100.

Would really like a step by step answer. So i can understand the process.

5 mL of standard aspirin solution (200ppm) is pipetted into a beaker and 1.5 mL of 0.5 M NaOH is added. The aspirin solution is then transfered into a 25-mL volumetric flask where 4 mL of 0.1 M Fe3+ solution is added to the flask. It is then diluted to the mark (25ml) with distilled water. What is the new concentration of the Asprin in mg/mL?

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