Briefly describe an experiment you would perform to demonstrate diffusion in gases
Answers
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.
Answer:
Apparatus to use: two gas jars of the same size and brown bromine gas.
procedures: The gas jar containing air molecules is inverted on another one containing brown bromine gas and the experiment left to stand for sometime.
observation: after sometime bromine gas spreads out to gas jar containing air molecules and a uniform color is observed in both jars.
Explanation: bromine gas diffuses from a region of high concentration to one of less concentration.