Test for Chlorides in milk – Its principle and procedure

Milk contain a high concentration of chloride ions. Test for chlorides in milk is performed on the filtrate obtain from the milk. First, learn how to get filtrate from milk. To do this first take 20 ml of milk in a beaker and add 18 ml of 1% acetic acid in it. The precipitate is formed due to calcium acetate. Filter the solution to obtain precipitate and filtrate.

Now to detect chlorides in milk follow the below procedure.

Chemical required:

• Concentrated nitric acid
• 2% silver nitrate
• Filtrate

Procedure:

• Take 1 ml of filtrate in a test tube.
• Add 2 drops of concentrated nitric acid in it.
• Then after mixing add 1 ml of 2% silver nitrate.
• Shake well.

Observation:

A white precipitate (silver chloride) forms, indicating the presence of chlorides in the milk filtrate.

Precautions:

Follow the below steps for proper result.

• Wash the apparatus before and after the experiment.
• Carefully handle all the chemicals in the lab.

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