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Methods used to dry oxygen gas in the laboratory

Answer Text:
Drying of oxygen gas.
- The resultant oxygen is usually moist due to the fact that it is collected over water;
- If required dry the gas ca be died using either of the two methods:
(i). Using sulphuric (VI) acid.
- Bubbling the gas through a wash bottle containing concentrated sulphuric (VI) acid;
- The concentrated sulphuric (VI) acid absorbs moisture from the gas leaving it dry;
- The dry gas is then draw into collection syringe;
(ii). Using anhydrous calcium chloride.
- From the flask the gas is passed through a U-tube containing anhydrous calcium chloride;
- The anhydrous calcium chloride also absorbs moisture from the gas leaving it dry;
- The dry gas is then drawn into a collection syringe;