Q6 What is meant by an aqueous and non-aqueous solutions? Give one example of each.
Q7 What is Tyndall effect? Explain two examples to show that Tyndall effect can be observed.
Q8 Explain the following terms- a. Electrophoresis b. Coagulation.
Q9 Calculate the mass of sodium sulphate required to prepare its 20% (mass per cent) solution in 100 g of water.
Q10 List five characteristics by which compounds can be distinguished from mixtures.
Answers
Your Solution:
6. Aqueous solution – When a solute is dissolved in water the solution is called an aqueous solution. Eg, salt in water, sugar in water and copper sulfate in water.
• Non-aqueous solution – When a solute is dissolved in a solvent other than water, it is called a non-aqueous solution. Eg, iodine in carbon tetrachloride, sulphur in carbon disulfide, phosphorus in ethyl alcohol.
7. If a light beam travels through a colloid, the Tyndall effect is the scattering of light. The particles of the individual suspension disperse and absorb light, making the beam visible. The scattering quantity depends on the light frequency and the particle density. Colloids illustrate the Tyndall effect.
Examples of the Tyndall Effect
• Milk is a colloid that contains globules of fat and protein. When a beam of light is directed at a glass of milk, the light is scattered. This is a great example of the Tyndall effect.
• When a torch is switched on in a foggy environment, the path of the light becomes visible. In this scenario, the water droplets in the fog are responsible for the light scattering.
8. Electrophoresis is a technique used to separate macromolecules in a fluid or gel based on their charge, binding affinity, and size under an electric field. Electrophoresis has a wide application in separating and analysing biomolecules such as proteins, plasmids, RNA, DNA, nucleic acids.
• Well, according to the general definition, coagulation is one of the various properties exhibited by colloidal solutions. This process of accumulation and settling down of particles is further known as coagulation or precipitation.
9. Let the mass of Sodium Sulphate be "x" g.
The mass of solution =(x + 100)g
xg of solute in (x + 100) g of solution
20% = x/(x + 100) × 100
» 20x + 2000 = 100x
» 80x = 2000
» x = 25g
∴ The Mass of Sodium Sulphate is 25g.
10. (In Picture)
I hope you got it.
Keep Learning & Keep Growing
Happy Learning :)
