Purity Test of Purified Water (For School & College level lab practical)
Purity Test of Purified Water
Requirement :
Test tube, test tube holder, test tube rack, labeling materials (pen, paper, scissors, gum).
Reagent :
Litmus paper (red and blue),
BaCl2,
AgNO3,
Ammonium Oxalate,
NH4OH,
Nessler's Reagent,
Sodium Sulfide,
Ingredients:
Supplied purified water.
Procedure:
Experiment 1:
Some amount of purified water is taken in a test tube.
Observation :
Clean, colorless, odorless.
Inference :
May be pure.
Experiment 2:
Litmus Test:
Some amount of purified water is taken in a clean test tube.
(a) A blue litmus paper is dipped into the solution.
(b) A red litmus paper is dipped into the solution.
Observation :
(a) The colour of blue litmus paper is not changed.
(b) The colour of red litmus paper is not changed.
Inference :
(a) Absence of Acid.
(b) Absence of alkali.
Experiment 3:
Some amount of purified water is taken in a test tube. Few drops of BaCl2 solution is poured into that test tube.
Observation :
No white precipitation is produced.
Inference :
Absence of Sulphate (SO42-) .
Experiment 4:
Some amount of purified water is taken in a test tube. Few drops of AgNO3 solution is poured into it.
Observation :
No white precipitation is found.
Inference :
Absence of Chloride.
Experiment 5:
Some amount of purified water is taken in a test tube. Few drops of Ammonium Oxalate solution is poured into that test tube.
Observation :
No white precipitation is formed.
Inference :
Absence of Ca (Calcium).
Experiment 6:
Some amount of purified water is taken in a test tube. Few drops of NH4OH solution is poured into that test tube.
Observation :
No white precipitation is formed.
Inference :
Absence of Mg (Magnesium).
Experiment 7:
Some amount of purified water is taken in a test tube. Few drops of Nessler's Reagent is added with that.
Observation :
No brown precipitation is formed.
Inference :
Absence of NH3.
Experiment 8:
Some amount of purified water is taken in a test tube. Few drops of Sodium Sulfide solution is poured into that test tube.
Observation :
No brown, black or brownish black colour is produce.
Inference :
Absence of Pb (lead), Fe (Iron) and Cu (Copper).
Conclusion :
Supplied purified water is pure.
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