# 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

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#### 50 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

• Anyido Stephen

How ethene is prepared in lab

• Gilbert Ayieko

I need more notes delivererd to my email.

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.

• Brian Ochieng

oxygen is used by sea divers,mountain climbers,combation

3. anna kinabo

can you send for me the preparation of oxygen in gmail

• paul jhn

why Hydrogen peroxide mostly used for the preparation of oxygen gas than potassium chlorate?

4. christopher

what are the uses of oxygen

• Edwin

Uses of oxygen
1:to burn thingy
2:to breath

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

• Iggah mukhusin

3KCLO2 mno2-KCL+3O2

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

• biko

uses of oxygen and hydrogen

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

• Iggah mukhusin

-Used for making metal especially in car industries

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.

• Edwin

1:to break down organic

• Andy

Used in manufacturing of phosphate fertilizer

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

• Palak

It’s ok

17. Osolo

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

18. Gabriel

how do you prepare it under hydrogen peroxide in presence of manganese

19. James Anthonio

it’s ok

20. Kwagala

Write the equation for the reaction that takes place in the preparation of dry samples of oxygen gas that are prepared in the lab from hydrogen peroxide

21. Andy

Sulphuric acid is used in manufacturing of phosphate fertilizer

22. Andy

what is the function of sulphuric acid when preparing oxygen?

• Joshua

Is to be a catalyst in hydrogen

23. Soumili Sengupta

24. Iggah mukhusin

Yap but what is hydrated iron III oxide

25. rango

what is upward delivery and downward delivery. please tell me if you know.

26. Sofia

Laboratory preparation of oxygen how it is made

27. PETER

WHAT IS THE ROLE OF MnO2 AND KMnO4 IN THE PREPARATION OF CHLORINE

28. Bonface Mwaide

Need more notes

29. Chogor Paul Israel

What acid is used for preparation of oxygen using iron(iii) chloride

30. higenyi

Name the method used to collect dry oxygen in the lab giving the reason for the answer