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

Explanation:

A true solution has particle size < 10-9 m. It is a homogeneous mixture which is clear and transparent. It passes through the filter paper easily and is stable.

Colloid has particle size 10-9 m- 10-6 m. heterogeneous and opaque.

Answer 2

$\sf\underline\green{Aim:-}$

To prepare a colloidal solution of starch in water and egg albumin/milk in water and distinguish between these on the basis of:

1.Transparency

2.Filtration criterion

3.Stability

$\sf\underline\green{Procedure:-}$

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

1. 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.

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

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

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

5. In beaker H, add egg albumin and stir vigorously.

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

$\sf\underline\green{Results:-}$

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

⇒Beaker B – Sugar forms a form a true solution in water.

⇒Beaker C – Alum forms a form a true solution in water.

⇒Beaker D – Soil forms a form a suspension in water.

⇒Beaker E – Chalk Powder forms a form a suspension in water.

⇒Beaker F – Fine sand forms a form a suspension in water.

⇒Beaker G – Starch forms a form a colloidal solution in water.

⇒Beaker H – Egg albumin forms a form a colloidal solution in water.

$\sf\underline\green{Precautions:-}$

• 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.

Observation table and diagrams are in those attachments:

Explanation:

hope its helpful to you