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About CCA!
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| Silver Mirror - Tollens Test for Aldehydes |
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Voiceover
Aqueous solutions of glucose, silver nitrate plus ammonium nitrate, and sodium hydroxide are mixed in a Florence flask. The flask is stoppered and swirled to evenly coat the flask with the mixture. A silver mirror soon coats the flask as the Ag(I) ion is reduced to Ag metal and glucose is oxidized to gluconic acid.
Discussion
A silver mirror coats the flask because the Ag(I) ion is reduced to Ag(0) as Ag(I) oxidizes glucose to gluconic acid.
Silver Mirror - Tollens Test for Aldehydes |
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Safety note: Tollens’ reagent may explode on storage. Demonstrators repeating this should use only freshly prepared reagent and dispose of the reactions’ products immediately after the demonstration.
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Citation:
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Kemp, M.
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J. Chem. Educ. 1981, 58, pp 655-656.
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Design, Text and Demonstrator:
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Gary Trammell
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University of Illinois at Springfield, Springfield, IL 62794
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Videographer/Editor:
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Steve Dykema
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University of Illinois at Springfield, Springfield, IL 62794
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Voice:
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Margaret Biddle
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University of Wisconsin - Madison, Madison, WI 53706
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Audio Production:
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Greg Minix
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University of Wisconsin - Madison, College of Engineering, Madison, WI 53706
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Jerrold J. Jacobsen
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University of Wisconsin - Madison, Madison, WI 53706
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