Oxygen Gas Testing

Share  | 

The purity of the oxygen product and the oxygen content of the crude nitrogen gas is measured sample of gas and a highly activated form of copper contained in a saturated solution of Ammonium chloride in Ammonium Hydroxide.
 

Oxygen Gas Apparatus

• Sample gas can be hosed from the gas entry at the right extreme.

• A 3 way stop cock to permit the gas to be bubbled.

• The bubbling goes through the glass tube.

• The glass tube is inserted in a purging vessel.

• A graduated burette in the center.

• The burette is connected on one side with the purging vessel and on the other with the reaction chamber.

• The chamber passes through another 3 way stop cock.

• Burette is connected with a levelling bottle by rubber pipe.

• Reaction chamber is enclosed with a reservoir.

• Rubber cork is fitted in the bottom of the reservoir.

Oxygen Test Procedure

• Mix one volume of Sp. Gr.0.90 ammonium hydroxide with two volume of distilled water.

• Then add ammonium chloride until solid crystals are formed and settle at the bottom.

• Invert the reaction chamber set and fill it with copper wire in spiral form.

• Bring the copper wire in an upright position and connect with the burette.

• Fill the reservoir and reaction chamber with test solution.

• Draw the test solution from the reservoir in the reaction chamber by turning the burette stop cock .

• Squeeze the rubber pipe to expel all the air and then close the stop cock, so that reaction chamber and the inter-connecting rubber pipe are completely filled with test solution.

• The purging vessel is half filled with water and the sample gas to be tested is allowed to bubble through water to atmosphere.

• Then controlling the flow of oxygen slowly open the stop cock and allow the oxygen to pass into the burette.

• When burette is filled below the bottom mark, close the stop cock.

• Adjust the level of the gas in the burette to the 100 cc mark by holding the leveling bottom at the level of the liquid in the burette.

• Then carefully open both the cocks and allow the gas to bubble through the purging vessel to atmosphere.

• Pass the sample gas between burette and chambe rseveral times.

• The oxygen in the sample reacts with the copper to form an oxide which dissolves in the solution.

• The unabsorbed impurities do not react with copper and are transferred from the chamber to the buretter by lowering the leveling bottle.

• Observe all the unabsorbed materials giving out the percentage of impurities in the sample.

• This finally gives the percentage of oxygen in the sample indicating purity test of oxygen.