A colloidal solution of starch in water and egg albumin/milk in water and
distinguish between these on the basis of transparency filtration criterion
stability write AIM
Answers
Explanation:
colloidal solution of starch in water: Step 1: 1% of dry corn starch is mixed with 3 ml of distilled water in beaker. Step 2: 97 ml of boiling distilled water is added to it and stirred well. Step 3: It is been heated for 2 minutes and stored in test tube labelled A after cooling.
Answer:
To prepare colloidal solutions of starch and egg albumin in water.
Colloidal solution of starch in water:
Take about 1 g of starch in a china dish, pour 10 mL of distilled water in the dish and stir the mixture. Now take 90 mL of hot, boiling water.
(Heat the water in beaker using Bunsen burner)
Stir the contents of the china dish continuously and pour the contents in the boiling water. Allow the contents to cool. Record your observation.
(The starch + water solution is colloidal in nature.)
Colloidal solution of egg albumin in water:
Take 10 ml of water in a beaker. Break an egg and discard the egg shells. Separate the white portion of egg from the yellow part. Add a very small quantity of egg albumin to it. Stir the contents thoroughly with the help of a glass rod. Then add 90 mL of distilled water with continuous stirring and few drops of dil. acid (dil. HCL, dil.H2S04). Record your observation.
(Egg albumin + water solution is colloidal in nature.)
To distinguish the above formed solutions on the basis of transparency, filtration criterion and stability:
Take one true solution —> salt + water
Take one suspension —> chalk + water
Take one colloidal solution —>egg albumin + water
Transparency:
Take 3 test tubes with a colloid, suspension and true solution in each respectively. Paste a white paper with tick mark on one side of each test tube. Look at the tick mark through the contents of the three test tubes from the other side. Check for the transparency of tick mark.
Record your observations.
Filtration Criterion:
Take 3 tripod stands, place a funnel over each stand. Fix the filter paper in the funnel and check for the filtration criterion.Record your observations.
Stability Criterion:
Take 3 test tubes with a colloid, suspension and true solution in each respectively. Shake all the test tubes and keep them in the test tube stand, allow it to stand for 5 minutes.
Record your observations.