Laboratory preparation of Hydrogen Gas

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

$$\ce{Zn + dil. H2SO4->ZnSO4 (aq) + H2 ^ }$$

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


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.
$$\ce{Mg + dil. H2SO4->MgSO4 + H2 ^ }$$

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16 Responses to “Laboratory preparation of Hydrogen Gas”

  1. Rajnish

    why sometimes a little amount of sulphuric acid is added during laboratory preparation of hydrogen?

    • temahlubi dlamini

      so that the reaction could happen at a speeder rate hha yewena

  2. Thabang mats'oele

    How to prepair hydrogen and oxygen

  3. trilok chandra adhikari

    lab preparation of hydrogen gas and study its properties.

  4. Johary

    why is it more favorable to use hydrogen peroxide instead of potassium chlorate in the preparation of oxygen in the laboratory?

  5. anna kinabo

    can you send stapes

  6. temahlubi dlamini

    they are sure good and helped me with my research

    • sizolwethu kunene

      ekse yekela kusichaphata

  7. sizolwethu kunene

    what is sulphuric reaction or redox reaction?

    • temahlubi dlamini

      manje ke unani


    how to prepare sulphur in a labolatory

  9. Janeth Mihali

    Enter your thoughts,comments,questions etc..why we are using granulete zink and not pure zink

  10. Nishit

    It is to write a project or notes

  11. Sagar Chowdhury

    How can we remove those impurities?


    observation made when hydrogen gas passed over copper 2oxide in the combustion tube

  13. biko

    what is uses of oxygen and hydrogen