Question

laboratory preparation of hydrogen with aim procedure principle and observation

Answer 1

PREPARATION OF HYDROGEN GAS IN LABORATORY

Before collecting hydrogen gas great care must be taken to ensure that all the air has been displaced from the apparatus since a mixture of hydrogen with air is highly explosive.



PREPARATION OF HYDROGEN GAS IN LABORATORY

Hydrogen is prepared in the lab by the action of acids on metal’s dilute.
Zn+H2SO4——> ZnSO4+H2
Zn+ 2HCl—–>ZnCl2+H2
Sulphuric acid is added to granulated zinc. Zinc sulphate or zinc chloride is formed in solution and the hydrogen that is evolved is collected over water in a trough.

PROPERTIES OF HYDROGEN GAS:
1. It is a colorless, odorless gas.
2. Sparingly soluble in water and the solubility is not much affected by change of temperature.
USES OF HYDROGEN GAS:
1. It is used as a fuel in oxy-hydrogen blow pipes.
2. It is used to fill balloons and airships.
3. It is used for hardening of vegetable and animal oils.

Answer 2

The granulated zinc pieces are taken in a Woulfe’s bottle and the apparatus is fitted as shown in figure. The two necks of woulfe’s bottle is tighten up with cork so that no air enters from outside. It is connected with the delivery tube to a water trough containing water. Dilute sulphuric acid is poured slowly from the thistle funnel. Some crystals of copper sulphate are added to increase the rate of reaction. The hydrogen gas thus formed is collected in a gas jar through delivery tube by the downward displacement of water.



Laboratory preparation of Hydogen gas

Purification: The hydrogen gas thus obtained may contain different impurities like H2S, NO2, CO2, moisture etc. So, these impurities are removed by using suitable process to get pure hydrogen.

Very pure hydrogen gas can be prepared in lab by the following reaction. This is a short and sweet method.

Mg+dil⋅H2SO4⟶MgSO4+H2↑

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