Chemical Forums
1 Hour
1 Day
1 Week
1 Month
Forever
October 31, 2024, 07:55:29 PM
Forum Rules
: Read This Before Posting
Home
Help
Search
Login
Register
Chemical Forums
Chemistry Forums for Students
High School Chemistry Forum
titration of vitamin c with starch indicator
« previous
next »
Print
Pages: [
1
]
Go Down
Topic: titration of vitamin c with starch indicator (Read 3864 times)
0 Members and 1 Guest are viewing this topic.
futureengineer
New Member
Posts: 3
Mole Snacks: +0/-0
titration of vitamin c with starch indicator
«
on:
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.
Logged
UG
Full Member
Posts: 822
Mole Snacks: +134/-15
Gender:
Re: titration of vitamin c with starch indicator
«
Reply #1 on:
December 11, 2011, 10:39:55 PM »
Did you add the starch indicator?
Logged
futureengineer
New Member
Posts: 3
Mole Snacks: +0/-0
Re: titration of vitamin c with starch indicator
«
Reply #2 on:
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.
Logged
UG
Full Member
Posts: 822
Mole Snacks: +134/-15
Gender:
Re: titration of vitamin c with starch indicator
«
Reply #3 on:
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?
Logged
futureengineer
New Member
Posts: 3
Mole Snacks: +0/-0
Re: titration of vitamin c with starch indicator
«
Reply #4 on:
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.
Logged
Borek
Mr. pH
Administrator
Deity Member
Posts: 27820
Mole Snacks: +1808/-412
Gender:
I am known to be occasionally wrong.
Re: titration of vitamin c with starch indicator
«
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).
Logged
ChemBuddy
chemical calculators - stoichiometry, pH, concentration, buffer preparation,
titrations.info
Print
Pages: [
1
]
Go Up
« previous
next »
Sponsored Links
Chemical Forums
Chemistry Forums for Students
High School Chemistry Forum
titration of vitamin c with starch indicator