Question

When and why is molality preferred over molarity in chemistry?

Answer 1

Molality (m) and molarity (M) both express the concentration of a chemical solution. Molality is the number of moles of solute per kilogram of solvent. Molarity is the number of moles of solute per liter of solution. If the solvent is of water and the concentration of solute is fairly low (i.e., dilute solution), molality and molarity are approximately the same. However, the approximation fails as a solution becomes more concentrated, involves a solvent other than water, or if it undergoes temperature changes that could change the density of the solvent.

Answer 2

Answer:

Explanation:

Molatity is preferred in studies that involves changes in temperature as in some of the colligative properties of solutions. This is because molality depends on masses of solvent which do not change with temperature.