Available Answers

1. 1.

   Name a 'pure form' and an 'impure form' of water in the natural state.

2. 2.

   State what is potable water. Give its qualities or characteristics which make it fit for human consumption.

3. 3.

   Give a reason why water is called a 'universe solvent' but, an alkali is not.

4. 4.

   Name the solute, solvent & solution in the statement - 'sodium chloride dissolves in water to give sodium chloride solution'. Define each of the terms in italics.

5. 5.

   Explain how each of the following factors affects the formation of a solution -

   1. Proportion of the solute & the solvent
   2. Particle size of the solute
   3. Temperature of the solvent
6. 6.

   Define the term 'solubility' of a solute in water. If 10 g. of a solute is added to 100 g. of water at 50°C and stirred, it is seen that the total solute dissolves at that temperature giving an unsaturated solution. Is 10 g. the solubility of the solute in water. Give reasons.