The figure shows two identical volumetric flasks containing the same solution at two temperatures. (b) Does the molality of the solution change with the change in temperature? [Section 13.4]

검증된 단계별 안내

Understand the concept of molality: Molality (m) is defined as the number of moles of solute per kilogram of solvent. It is expressed as \( m = \frac{\text{moles of solute}}{\text{kilograms of solvent}} \).

Recognize that molality is independent of temperature: Unlike molarity, which depends on the volume of the solution and can change with temperature, molality is based on the mass of the solvent, which does not change with temperature.

Consider the effect of temperature on the solution: When temperature changes, the volume of the solution may expand or contract, but the mass of the solvent remains constant.

Conclude that since molality is based on the mass of the solvent and not the volume of the solution, it does not change with temperature.

Therefore, the molality of the solution remains constant despite changes in temperature.

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Molality

Molality is a measure of the concentration of a solute in a solution, defined as the number of moles of solute per kilogram of solvent. Unlike molarity, which is affected by changes in volume due to temperature, molality remains constant because it is based on the mass of the solvent, which does not change with temperature.

Effect of Temperature on Solutions

Temperature can influence the physical properties of a solution, such as density and viscosity, but it does not affect the molality. As temperature increases, the kinetic energy of the molecules increases, which may lead to changes in solubility, but the mass of the solvent remains unchanged, keeping the molality constant.

Identical Volumetric Flasks

Using identical volumetric flasks ensures that the volume of the solution remains constant regardless of temperature changes. This consistency is crucial for comparing the properties of the solutions at different temperatures, as it eliminates volume as a variable, allowing for a clear focus on how temperature affects other properties like molality.