12
Estimation of Chloride and Salt in Given Water Samples
Aim
To estimate the amount of chloride and salt content in the given water samples A and B.
Reagents
0.005N silver nitrate solution and 10% potassium chromate.
Principle
When potassium chromate is added as an indicator to the water sample, it dissolves in water and the chromate ions give yellow colour to the sample. Sodium chloride is present in the dissolved state in the given sample of water. When this is titrated against silver nitrate, the silver ions react first with the chloride ions present in the sample and form silver chloride precipitate and sodium nitrate.
AgNO3 + NaCl → AgCl↓ + NaNO3
When all the chloride ions in the sample are precipitated, the excess silver nitrate present ...
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