Answered: The % w/w I– in a 0.6712-g sample was…

Chemistry & Chemical Reactivity

10th Edition

ISBN:9781337399074

Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Chapter4: Stoichiometry: Quantitative Information About Chemical Reactions

Section4.9: Spectrophotometry

Problem 2.1ACP: Excess KI is added to a 100.0-mL sample of a soft drink that had been contaminated with bleach,...

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The % w/w I^– in a 0.6712-g sample was determined by Volhard titration. After adding 50.00 mL of 0.05619 M AgNO₃ and allowing the precipitate to form, the remaining silver was back titrated with 0.05322 M KSCN, requiring 35.14 mL to reach end point.

AgNO₃ + I^– → AgI (s) + NO₃^–

Ag⁺ + SCN^– → AgSCN

	How many millimoles of AgNO₃ reacted with I^–?
	How many milligrams of I^– (MM=126.9 g/mol) were present in the sample?
	What is the % w/w I^– in the sample?

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