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titration of vitamin c with starch indicator
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Topic: titration of vitamin c with starch indicator (Read 3860 times)
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futureengineer
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titration of vitamin c with starch indicator
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December 11, 2011, 10:37:07 PM »
While doing my titration I was adding iodine solution to my vitamin c starch indicator solution and after adding 21 units it turned from clear to yellow. Was this the endpoint? I thought it was supposed to turn bluish black.
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UG
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Re: titration of vitamin c with starch indicator
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December 11, 2011, 10:39:55 PM »
Did you add the starch indicator?
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futureengineer
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Re: titration of vitamin c with starch indicator
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December 12, 2011, 09:34:43 AM »
Yes, At least I think I did. Could it be that I didn't have enough? I used 20 ml of vitamin c solution and 10 drops of starch indicator. The starch indicator was made with 1/4 teaspoon starch and 200ml of water.
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UG
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Re: titration of vitamin c with starch indicator
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December 12, 2011, 06:06:41 PM »
Wikipedia quotes a standard starch solution is made from 3g of soluble starch in 1 L of heated water, does that sound close to what you did?
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futureengineer
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Re: titration of vitamin c with starch indicator
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December 12, 2011, 10:24:57 PM »
Yes, I used 1 gram per 200 ml of warm water. That would be 5 grams in a liter wouldn't it? That should have been plenty of starch. I wonder if I need to add more than 10 drops into my vitamin c solution.
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Borek
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I am known to be occasionally wrong.
Re: titration of vitamin c with starch indicator
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Reply #5 on:
December 13, 2011, 02:44:20 AM »
http://www.titrations.info/iodometric-titration-Vitamin-C
Procedures I know call for much more starch solution (of a comparable concentration).
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ChemBuddy
chemical calculators - stoichiometry, pH, concentration, buffer preparation,
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titration of vitamin c with starch indicator