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Course: AP®︎/College Chemistry > Unit 4

Lesson 7: Introduction to titration
Science
AP®︎/College Chemistry
Chemical reactions
Introduction to titration
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Introduction to titration

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Problem

2MnOA4A−(aq)+5HA2OA2(aq)+6HA+(aq)→2MnA2+(aq)+5OA2(g)+8HA2O(l)
The reaction between MnOA4A−(aq) and HA2OA2(aq) in acidic solution is represented above. In a titration experiment, a 0.020M solution of KMnOA4(aq) is added from a buret to an acidified sample of HA2OA2(aq) in a flask. The endpoint of the titration is determined by the appearance of a faint pink color in the mixture.
Initial buret reading5.82 mL
Final buret reading35.82 mL
Based on the data in the table above, how many moles of HA2OA2(aq) were in the sample?
Choose 1 answer: