Carbohydrates

CCA! Volume 5

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Carbohydrates

Dehydration of sucrose, Fehling's test, Benedict's test, osazone formation, destructive distillation of wood, oxidation of sucrose with potassium chlorate, and guncotton are demonstrated.

Dehydration of Sucrose with Sulfuric Acid

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1.9 MB
30 seconds

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6 Slides

Concentrated sulfuric acid is added to sucrose forming carbon, steam and sulfur dioxide.

Sucrose Dehydration gives Sulfur Dioxide

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2 movies

Sulfuric acid dehydrates sucrose forming carbon.

Fehling's Test for Reducing Sugars

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2.4 MB
39 seconds

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6 Slides

Glucose reduces blue Fehling's reagent to form copper(I) oxide. Sucrose does not reduce Fehling's reagent.

Benedict's Test for Reducing Sugars

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5 movies

Tests for glucose, sucrose, and fructose.

Osazone Formation

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3 MB
46 seconds

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6 Slides

An aqueous solution of phenylhydrazine hydrochloride buffered with sodium acetate is added to each of glucose, fructose, and sucrose. They are heated.

Oxidation of Sucrose with Potassium Chlorate

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.7 MB
12 seconds

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6 Slides

A pile of sucrose is mixed with potassium chlorate and a drop of concentrated sulfuric acid is added.

Combustion of Nitrocellulose (Guncotton)

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1.8 MB
28 seconds

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7 Slides

Cellulose burns slowly in a flame whereas nitrocellulose burns very rapidly.

Destructive Distillation of Wood

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5.2 MB
81 seconds

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5 Slides

Wood is heated, decomposes, and forms methanol.

Copyright © 2001 Division of Chemical Education, Inc., American Chemical Society. All rights reserved.