In an unknown sample, the amount of ascorbic acid (C6H8O6) is determined using coulometry. Analysis of a 250.0 mg sample gives an endpoint with starch after reaction with electrogenerated iodine in 384 sec using a current of 30.0 mA. A) What specific type of coulometric method is used?  B) What is the % ascorbic acid, (C6H8O6), (FW= 176.12 g/mol) in the sample?

Fundamentals Of Analytical Chemistry
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Chapter22: Bulk Electrolysis: Electrogravimetry And Coulometry
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Problem 22.30QAP
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In an unknown sample, the amount of ascorbic acid (C6H8O6) is determined using coulometry. Analysis of a 250.0 mg sample gives an endpoint with starch after reaction with electrogenerated iodine in 384 sec using a current of 30.0 mA.

A) What specific type of coulometric method is used? 

B) What is the % ascorbic acid, (C6H8O6), (FW= 176.12 g/mol) in the sample?

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