Hi, i'm working on the lab report for Iodometric determination of Cu in Brass and i...

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Chemistry

Hi, i'm working on the lab report for Iodometric determinationof Cu in Brass and i need help with these questions. I greatlyappreciate your help.
Info: This experiment has two parts:standardization of the thiosulfate solution, and assay of thecopper. In the standardization of the thiosulfate solution, a knownamount of iodine is created from KIO3 and excess iodide, thentitrated with the thiosulfate. In the copper assay, iodine isformed from the reaction between copper and excess iodide, thentitrated with the thiosulfate.
1. How is the sample prepared for titration? how is the sampletitrated?
2. what is the reaction between the titrant and iodine? how isthe titrant concentration calculated?

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3.6 Ratings (252 Votes)

1SOLUTIONPREPARATION The brass sample which you will receive does not haveto be dried before use Accurately weight brass directly intoseparate 250 mL Erlenmeyer flasks In the fume hood add 5 mL of 6M HNO3 Warm the solution on a hot plate in the fumehood until dissolution is complete Add 10 mL of concentrated not3 M H2SO4 and continue heating until whiteSO3 fumes appear It is important that you do notmistake ordinary water vapor for SO3 fumes It is alsoimportant at this point that the flasknot be removed from the hoodSO3 See Answer

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