Question

In the general phase diagram of Ferric chloride – water system, what causes reduction in water content in ferric chloride at each step?

(a) Reduction in moisture content

(b) Reduction in concentration

(c) Reduction in equilibrium shift

(d) Increase in temperature

I have been asked this question during an interview.

Question is from Uses and Limitations of Phase Rule in section Phase Rule of Engineering Chemistry I

Answer 1

The correct option is (a) Reduction in moisture content

Easiest explanation: Since for each transition from one phase to another for a component, the moisture content decreases due to increase in temperature. Hence the water concentration in ferric chloride decreases as the temperature increases.