Question

How to prepare a hydrogen gas in laboratory?

Answer 1

Hydrogen gas is prepared in laboratory by the action of dilute HCl upon granulated zinc.

Zn+dil⋅H2SO4⟶ZnSO4(aq)+H2↑

Note: This is a redox reaction since Zn is oxidized and H+ ions is reduced here.

Procedure:

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↑
Hope it helps! ^^

Answer 2

hi

here is your answer

H2 production relies on a process called steam reforming.

This involves heating steam to 800 degrees C and combining with methane (CH4) over a catalytic material. The reactions release the Hydrogen from the methane and water molecules. The freed-up Oxygen and Carbon atoms combine to form CO2. Here’s what the reaction formula looks like:

CH4 + 2H20 + heat → CO2 + 4H2

As one might guess, this produces a lot of CO2. The molecular weight of CO2 is 44, while that of the four H2 molecules is only 8. So, not counting the source of energy to heat the steam, this means that the mass ratio of CO2 is 5.5 times greater that of the H2. If we consider the energy required to heat the steam also comes from combustion of hydrocarbons, the ratio ends up somewhere in the range of about 12:1.

One of the primary uses of hydrogen is the production of ammonia, which is used for fertilizer of most of the food that humans consume. There is, (forgive the pun), much to think about when food crops such as corn are grown to produce ethanol fuel, because the total carbon footprint also must consider the fertilizer and how it was made.

hope it helps

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