Question

each of the identical volumetric flasks contains the same solution at two different temperatures. what changes for the solution with temperature? molarity molality both molarity and molality neither molarity or molality

Explanation:

Step1: Recall molarity formula

Molarity ($M$) = $\frac{n}{V}$, where $n$ is the number of moles of solute and $V$ is the volume of the solution in liters. Volume of a liquid changes with temperature due to thermal - expansion or contraction.

Step2: Recall molality formula

Molality ($m$) = $\frac{n}{m_{solvent}}$, where $n$ is the number of moles of solute and $m_{solvent}$ is the mass of the solvent in kilograms. Mass is not affected by temperature.

Step3: Analyze the effect of temperature

Since volume ($V$) in the molarity formula changes with temperature, molarity changes. Since mass of solvent ($m_{solvent}$) in the molality formula is not affected by temperature, molality does not change.

Answer:

A. molarity