To determine the amount of chloride (in the form of Cl–) present in the given water sample by Mohr’s method.
If water containing chlorides is titrated with silver nitrate solution, chlorides are precipitated as white silver chloride.
Potassium chromate is used as indicator, which supplies chromate ions. As the concentration of chloride ions
approaches extinction, silver ion concentration increases to a level at which reddish brown precipitate of silver
chromate is formed indicating the end point.
- Erlenmeyer flasks
- Measuring cylinder
Reagents (» click to check the preparation of reagents)
- Chloride free distilled water.
- Standard silver nitrate solution (0.0141N)
- Potassium chromate indicator.
- Acid or alkali for adjusting pH.