Question

A beaker contains a dilute sodium chloride solution at 1 atmosphere. What happens to the number of solute particles in the solution and the boiling point of the solution, as more sodium chloride is dissolved?

Answer 1

Answer:

As more sodium chloride is dissolved, higher is the boiling point of the solution

Explanation:

The boiling point- the temperature at which the solution boils- will increase as more solute is added. That is a colligative property called boiling point elevation. Colligative propeties are those that depend on the number of particles of solute in a solution. As more solute is added (sodium chloride or NaCl), more particles of solute will be present in the solution and the boiling point of the solution will be higher. The mathematical expression for the boiling point elevation (ΔTb) is the following:

ΔTb= Kb x m

Where Kb is a molal constant and m is the molality of the solution. That expression shows that the elevation of boiling point depends on the concentration of the solute expressed in terms of moles per mass of solution.