Dehydration of Sugar (Black Foam)
- Page ID
- 128803
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Required Training |
Required PPE |
|---|---|
|
UC Lab Safety Fundamentals |
Lab coat, safety glasses/goggles, nitrile gloves |
|
Equipment |
Chemicals |
|
150 mL beaker |
80 g sucrose |
|
Large catch pan |
20 mL conc. sulfuric acid |
Procedure:
- Pour 20 mL concentrated sulfuric acid on the sucrose in the tall beaker in a catch pan.
- The sucrose will dehydrate and form a large black column of black carbon-carbon dioxide foam.
Discussion:
This demonstration shows the dehydration of the organic molecule, sucrose. It follows the reactions below:
C12H22O11 → 12 C + 11 H2O -919 kJ/mol
C + O2 → CO2 -394 kJ/mol
C12H22O11+ 12 O2 → 12 CO2 + 11H2O -5641 kJ/mol
Hazards:
Concentrated sulfuric acid is corrosive and may sputter out of the reaction vessel—always wear PPE and teat any spills with sodium bicarbonate or another suitable chemical before cleaning the area with water
SOP:
Corrosive – Sulfuric Acid
Disposal (by Storeroom)
Return the beaker, catch pan, and any auxiliary waste created to the storeroom for proper neutralization and disposal.