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A solution of sodium thiosulfate was standardized by dissolving 0.1310 g KIO3 in water, adding a large excess of KI, and acidifying with HCI. The liberated iodine required 42.64 mL of the thiosulfate solution to decolorize the blue starch/iodine complex. Calculate the molar concentration of the Na₂S₂O3.

A solution of sodium thiosulfate was standardized by dissolving 0.1310 g KIO3 in water, adding a large excess of KI, and acidifying with HCI. The liberated iodine required 42.64 mL of the thiosulfate solution to decolorize the blue starch/iodine complex. Calculate the molar concentration of the Na₂S₂O3.

General Chemistry - Standalone book (MindTap Course List)
General Chemistry - Standalone book (MindTap Course List)
11th Edition
ISBN:9781305580343
Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Publisher:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Chapter21: Chemistry Of The Main-group Elements
Section: Chapter Questions
Problem 21.163QP
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A solution of sodium thiosulfate was standardized by dissolving 0.1310 g KIO3 in water, adding a large excess of KI, and acidifying with HCI. The liberated iodine required 42.64 mL of the thiosulfate solution to decolorize the blue starch/iodine complex. Calculate the molar concentration of the Na₂S₂O3. 103 (aq) + (aq) 12 (s) 12 (s) + S2O32- (aq) (aq) +S406²- (aq) MM: KIO3 = 214.00 12 = 253.81 Na2S2O3 = 158.11
Transcribed Image Text:A solution of sodium thiosulfate was standardized by dissolving 0.1310 g KIO3 in water, adding a large excess of KI, and acidifying with HCI. The liberated iodine required 42.64 mL of the thiosulfate solution to decolorize the blue starch/iodine complex. Calculate the molar concentration of the Na₂S₂O3. 103 (aq) + (aq) 12 (s) 12 (s) + S2O32- (aq) (aq) +S406²- (aq) MM: KIO3 = 214.00 12 = 253.81 Na2S2O3 = 158.11
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