Properties of Carbohydrates

DATA COLLECTION

a) Dehydration

GLUCOSE

m = 0.5 g

OBSERVATION Change of state Color Viscosity Smell

Start Solid state. White color. No. No smell.

Action of heat Liquid state. Amber color. Yes. Smell of caramel.

Sulphuric acid Liquid state. White color. Yes. No smell.

Sulphuric acid + heat Liquid state. Black color. Yes. Smell of rotten eggs.

Sulphuric acid + strongly heated Solid state. Black color.

(Because of the gases volumen raises – we get charcoal.) No. Like setting on fire, because of SO2.

Table 1: Data collection from glucose in reaction known as dehydration

SUCROSE

m = 0.5 g

OBSERVATION Change of state Color Viscosity Smell

Start Solid state. White color. No. No smell.

Action of heat Liquid state. Amber color. Yes. Smell of caramel.

Sulphuric acid Liquid state. White color. Yes. No smell.

Sulphuric acid + heat Liquid state. Black color. Yes. Smell of rotten eggs.

Sulphuric acid + strongly heated Solid state. Black color. (Because of the gases volumen raises – we get charcoal.) No. Like setting on fire, because of SO2.

Table 2: Data collection from sucrose in reaction known as dehydration

In this part of experiment we should make also tests for CO, CO2, SO2. We did not do it but we told how we can do them:

- CO2 test: we put the mixture in lime-pit and blow inside. After that we should see white precipitation if CO2 is inside.

- CO and SO2 test we make so that we conduct them in water and then measure pH.

b) Oxidation

Carbohydrate Fehling