Test for calcium in milk:

Milk contain a high concentration of calcium. Test for calcium 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 calcium in milk follow the below procedure.

Chemical required:

• 2% potassium oxalate
• Filtrate

Procedure:

• Take 1 ml of filtrate in a test tube.
• Add 3 drops of 2%  potassium oxalate solution in it.
• Mix well.

Observation:

A white precipitate of calcium oxalate forms, which confirm the presence of calcium in milk.

Precautions:

Follow the below steps for proper result.

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