Question

preparation of colloids solutions of starch in water and egg albumin/milk in water and distinguish between on the basis of filtration criterion
with diagrams
&
with aim, material required, observations, conclusions, precautions.​

Answer 1

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Take a beaker of volume 250 mL and prepare 100 mL NaCl solution of 5% (w/v). Pipette out the albumin and pour it in the beaker containing sodium chloride solution with constant stirring. Stir it for 15-20 minutes to ensure that the sol is prepared well.

Answer 2

Answer:

Experiment

AIM

To prepare

A true solution of common salt, sugar and alum.

A suspension of soil, chalk powder and fine sand in water.

A colloidal solution of starch in water and egg albumin in water and distinguish between these on the basis of

transparency

filtration

stability.

MATERIALS REQUIRED

Test tubes, beakers, water, common salt, sugar, alum, soil, chalk powder, fine sand, egg albumin, starch, funnel, glass rod, filter paper.

PROCEDURE

Preparation of solutions/mixtures

Take 8 beakers and label them as A, B, C, D, E, F, G and H and add 50 ml of water to each of these beakers.

Add samples of salt, sugar and alum to beakers A, B and C. Stir to make clear solution.

Add soil, chalk powder and fine sand to beaker D, E and F. Stir for sometime.

Add a small amount of starch to the water and boil the content in beaker G.

In beaker H, add egg albumin and stir vigorously.

Observe the mixture and record them in the table given below.

OBSERVATION TABLE

Explanation:

RESULTS

Beaker A – Common salt forms a true solution in water.

Beaker B – Sugar forms a……………. in water.

Beaker C – Alum forms a …………….in water.

Beaker D – Soil forms a……………. in water.

Beaker E – Chalk Powder forms a……………. in water.

Beaker F – Fine sand forms a……………. in water.

Beaker G – Starch forms a……………. in water.

Beaker H – Egg albumin forms a …………….in water.

PRECAUTIONS

Distilled water should be used.

The components should be mixed in small amounts.

Fold the filter paper properly and moisten it before use.

Glass rod should be clean.

Wash your hands properly with soap after experiment.