Laboratory Preparation of Oxygen

Oxygen is prepared in lab generally in two ways either by the application of heat or no application of heat.

Using heat:
Oxygen in lab is prepared by heating the mixture of powdered potassium chlorate and manganese dioxide in the ratio 4:1 in a hard glass test tube. The oxygen gas is observed in a gas jar through the downward displacement of water. The reaction involved is given below:
$$\ce{2KClO3->[{200-300^{\circ}C}][\ce{MnO2}]2KCl + 3O2 ^ }$$

Preparation of oxygen on application of heat

Without heat:
The dry sodium peroxide is taken in a conical flask 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. Water is poured slowly from the thistle funnel. Here sodium peroxide reacts with water at ordinary temperature to give hydrogen gas. The hydrogen gas thus formed is collected in a gas jar through delivery tube by the downward displacement of water. The reaction takes place as below:
$$\ce{2Na2O2 + 2H2O->4NaOH + O2 ^ }$$

Note: This reaction is very quick and hydrogen gas is collected in a gas jar within a fraction of seconds.

Preparation of oxygen without the application of heat

Do you like this article ? If yes then like otherwise dislike : 37

25 Responses to “Laboratory Preparation of Oxygen”

  1. od mansh

    carbon and it’s compound

    • shitu

      Carbon is a non metal under d names chacoal, soot and diamond. It’s occurs naturally as diamond and graphite

  2. peter

    what are some of commercial uses of oxygen

    • Nancy

      Its used in welding , used as fuel in rockets, steel making and breathing aid in hospitals .

    • Monicah

      You heat hdrogyen to decompose into water and oxygen. Sulphuric acid is used to clean metal. Oxygen is used to by plants to make food ,in hospital for patients.commercial uses of oxygen by divers in swimming pool ,by patients in hospitals.

  3. anna kinabo

    can you send for me the preparation of oxygen in gmail

  4. christopher

    what are the uses of oxygen

  5. victor

    what is the function of copper sulphate granules in the preparation of hydrogen gas?

  6. victor

    Enter your thoughts,comments,questions etc..what is the function of copper sulphate granules in the preparation of hydrogen gas?

  7. WAKO

    Write the chemical equation of preparation of Oxygen by decomposition of potassium chlorate/permanganate

  8. victor

    What about the preparation of oxygen frm hydrogen

    • Monicah

      You heat hdrogyen to decompose into water and oxygen.

  9. Michael

    what is the drying agent and the substance used to remove impurity

  10. Anubhav

    It is good to be a Chimest

  11. Anubhav

    It is good to be a Chimest
    I am from class 11 and
    I like chemistry

    • Anubhav

      Both are me

    • Osolo

      N2 is unreactive gas. How does it react with H2 gas to form NH3 gas?Help me pliz

  12. isaac newton

    what is the industrial preparation of oxygen gas

  13. isaac newton

    what is the commercial uses of sulphuric acid

    • Monicah

      You heat hdrogyen to decompose into water and oxygen. Sulphuric acid is used to clean metal.

  14. Monicah

    You heat hdrogyen to form water and oxgyen

  15. Malyashree Chatterjee

    It’s Ok!!

  16. Malyashree Chatterjee

    How do we prepare O2 from Na2O2 ???

    • CHERUIYOT KETER

      Na2O2+H2O->NaOH+O2

  17. Osolo

    What are some of the uses of products obtained from preparation of oxygen?