Question

Suppose you take a solution and add more solvent, so that the original mass of solvent is doubled. You take this new solution and add more solute, so that the original mass of the solute is doubled. What happens to the molality of the final solution, compared to the original molality?

A) It will increase or decrease depending on the molar mass of the solute
B) There is no way to tell without knowing the molar mass of the solute
C) It is doubled.
D) It is unchanged

Answer 1

When additional solvent or solute is added to a solution, the molality of the final solution remains unchanged.

Step-by-step explanation:

When additional solvent is added to a solution, the molality of the final solution remains unchanged. This is because the number of moles of solute does not change, while the mass of solvent increases. Similarly, when additional solute is added to the solution, the molality of the final solution also remains unchanged. This is because the mass of solvent and the number of moles of solute both increase proportionally.