Preparation of Oxygen

Topic Content:

Laboratory Preparation of Oxygen:

1) From Potassium Trioxochlorate(V), KClO_3(s) :

On heating above its melting pointThe temperature at which a solid changes its state to liquid at atmospheric pressure is called the melting point of that liquid. The melting point is usually defined as the point... More (368°C), KClO₃ decomposes slowly to liberate oxygen gas, in the presence of manganese(IV) oxide which acts as a catalyst. The presence of the catalyst makes the reaction occur at a lower temperature and at a much faster rate.

\(\scriptsize 2KClO_{3(s)} \overset{MnO_2}{\underset{heat}{\large \rightarrow}} 2KCl_{(s)} + 3O_{2(g)} \)

If the gas is required dry, it is passed through concentrated anhydrous calcium chloride or tetraoxosulphate(VI) acid and then collected over mercury.

Oxygen is given off as a colourless odourless gas on heating. Oxygen cannot be collected by the displacement of air because its densityDensity is the measurement of how tightly a material is packed together i.e. how closely the particles are packed in the material. The tighter the material is packed the more its... More is nearly the same