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July 28, 2015

Homework Help: Chemistry

Posted by Ken on Monday, October 24, 2011 at 4:31pm.

Sulfite (SO3^2-) in wine was measured by the following procedure: 50.0ml of wine were added 5.00ml of solution containing (0.8043 g KIO3 + 5 g KI)/100ml. Acidification with 1.0ml of 6.0 M H2SO4 quantitatively converted IO3^- into I3^-. I3^- reacted with sulfite to generate sulfate, leaving excess I3^- in solution. Excess I3^- required 12.86ml of 0.04818 M Na2S2O3 to reach end point.

What is the concentration of sulfite in the wine? In milligrams of SO3^2- per liter?

Uh...I'm not quite sure how to start this problem. I know the answer just not the how to get there...

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