Explain why on addition of 0 mol of NaCI to 1 litre of water, the boiling point of water increases, while addition of 1 mol of methyl alcohol to one litre of water decreases its boiling point.

2

(a)

Concentration terms such as mass percentage, ppm, mole fraction and molality are independent of temperature, however molarity is a function of temperature. Explain.

2

(a)

What is the significance of Henry's Law constant K_H?

2

(a)

Why are aquatic species more comfortable in cold water in comparison to warm water ?

2

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(a) Explain the following phenomena with the help of Henry's law.
(i) Painful condition known as bends.
(ii) Feeling of weakness and discomfort in breathing at high altitude.
(iii) Why soda water bottle kept at room temperature fizzes on opening ?

2

(a)