info.improove@gmail.com
+91 81788 23424

Experiment 30: Testing impurities in milk

Experiment 30: Testing impurities in milk

Objective

To check the milk for impurities

Materials required:

  • 20mL milk
  • 1% iodine solution
  • test tube
  • soybean/ arhar powder
  • red litmus paper
  • dil. sulphuric acid

Procedure - Test for Starch

  • Add a few drops of tincture of Iodine or Iodine solution.
  • Formation of blue colour indicates the presence of starch.

Procedure - Test for Urea

  • Take a teaspoon of milk in a test tube.
  • Add ½ teaspoon of soybean or arhar powder.
  • Mix up the contents thoroughly by shaking the test tube.
  • After 5 minutes, dip a red litmus paper in it.
  • Remove the paper after ½ a minute.
  • A change in colour from red to blue indicates the presence of urea in the milk.

Procedure - Test for Formalin

  • Take 10 ml of milk in a tests tube and add 5 ml of conc. sulphuric acid from the sides of the wall without shaking.
  • If a violet or blue ring appears at the intersection of two layers then it shows presence of formalin.

Observations and Findings:

  • After the solvent has risen about 15 cm you will notice two different spots of blue and red colors on the filter paper. The pattern is called chromatograph.

Conclusions:

  • Over time, we see a pattern composed of various colors / components of the ink

Theory:

  • Household milk generally contains starch an impurity. In some cases, it might have urea or formalin (added to increase shelf life of milk).

Experiment-based learning kits

img
Chemistry Lab in A Box (Upto Class 10)

Comprehensive chemistry kit for Class 6 to 10

  • All reagents and lab equipment needed to do over 33 experiments as per Board syllabus

  • High quality and safe lab reagents

  • Videos of all the experiments Detailed instruction booklet with theory, concepts and procedures

MRPRs 4,499/-
AmazonRs 2,349/-
Buy on Amazon
FlipkartRs 2,399/-
Buy on Flipkart
HereRs 1,999/-
Buy Now
img
Refill for home experiment kits

Set of chemicals and reagents for home experiments

  • Support for all major science activity kits like Kutuhal, Einstein Box, Genius Minds, etc.

  • High quality and safe lab reagents

  • Strict quality testing procedures to ensure safety while doing experiments

MRPRs 2,499/-
AmazonRs 1,149/-
Buy on Amazon
FlipkartRs 1,199/-
Buy on Flipkart
HereRs 999/-
Buy Now!!
img
Basic chemistry equipment (starter kit)

Basic equipment to generate excitement towards science

  • Basic set of equipment like test tubes, holder, cleaner, filter papers, pipettes, litmus papers, etc.

  • High quality and safe lab equipment

  • Good starting point for children (suitable for children aged 7-10 years)

MRPRs 1,499/-
AmazonRs 499/-
Buy on Amazon
FlipkartRs 499/-
Buy on Flipkart
HereRs 449/-
Buy Now!!
img
Crystallography @ home

Make bright-colored crystals of different shapes and sizes

  • All reagents and equipment needed to make bright crystals - from multiple compounds

  • Instruction booklet and videos

  • Learn about crystallography - crystal shapes, solubility, effect of temperature, etc.

MRPRs 1,499/-
AmazonRs 1,149/-
Buy on Amazon
FlipkartRs 1,149/-
Buy on Flipkart
HereRs 999/-
Buy Now!!