Question

write activity to show diffusion of:
a.gas&gas
b. liquid & liquid
c. solid & liquid

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Answer 1

a)You can smell perfume because it diffuses into the air and makes its way into your nose.

Answer 2

Experiment # 1

Experiment # 1Diffusion of Solid in Liquid:

Experiment:

A beaker is almost filled with water. Some crystals of CuSO4 or KMnO4 are dropped carefully without disturbing water and is left as such for some time.

Observation:

The water is uniformly coloured, blue in case of CuSO4 and pink in case of KMnO4.

Inference:

The molecules of the chemicals diffuse gradually from higher concentration to lower concentration and are uniformly distributed after some time. Here, CuSO4 or KMnO4 diffuses independently of water and at the same time water diffuses independently of the chemicals.

Experiment # 2

Experiment # 2Diffusion of Liquid in Liquid:

Experiment:

Two test tubes are taken. To one 30 rim depth of chloroform and to the other 4 mm depth of water are added. Now to the first test tube 4 mm depth of water and to the other 30 mm depth of ether are added (both chloroform and ether form the upper layer).

Ether must be added carefully to avoid disturbance of water. The tubes are stoppered tightly with corks. The position of liquid layers in each test tube is marked and their thickness measured.

The tubes are set aside for some time and the thickness of the liquids in each test tube is recorded at different intervals.

Observation:

The rate of diffusion of ether is faster than that of chloroform into water as indicated by their respective volumes.

Inference:

The rate of diffusion is inversely proportional (approxi­mately) to the square root of density of the substance. Substances having higher molecular weights show slower diffusion rates than those having lower molecular weights.

In the present experiment ether (C2H5-O-G2H5, J mol. wt. 74) diffuses faster into water than chloroform (CHCI3, mol. wt. 119.5). This ratio (74: 119-5) is known as diffusively or coefficient of diffusion.

Experiment # 3

Experiment # 3Diffusion of Gas in Gas:

Experiment:

One gas jar is filled with CO2 (either by laboratory method: CaCO3 + HCL, or by allowing living plant tissue to respire in a closed jar). Another jar is similarly filled with O2 (either by laboratory method: MnO2 + KClO2, or by allowing green plant tissue to photosynthesize in a dosed jar). The gases may be tested with glowing match stick.

The oxygen jar is then inverted over the mouth of the carbon dioxide jar and made air-tight with grease. It is then allowed to remain for some time. The jars are carefully removed and tested with glowing match stick.

Observation:

The glowing match sticks flared up in both the jars.

Inference:

The diffusion of CO2 and O2 takes place in both the jars until finally the concentrations are same in both of them making a mixture of CO2 and O2. Hence the glowing match sticks flared up in both the jars.

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