What do the solid in the diagram represent? What phase changes occur in going fr

Question

What do the solid in the diagram represent? What phase changes occur in going from point A to point B? Is the triple point for water, above atm pressure? According to the phase diagram above, starting at point A, what phase change occur if the pressure is increased and the temperature remains constant? If NaCl is added to water, the vapor pressure of the resulting solution is reduced relative to that of pure water. Draw the vapor pressure curve of the solution on the phase diagram and show the effect on the boiling point and the freezing point. What is a non - volatile solute? Why is the pressure of a solution containing a non - volatile solute lower than the pure solvent? If the solution consists of a solvent and a volatile solute, would anything be different in the drawing? Discuss any differences.

Explanation / Answer

5. When a non volatile solute is added to a volatile solvent a fraction of the surface sites are occupied by non volatile solute molecules which reduces number of vapour per unit surface area and hence vapour pressure decrease.

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