molal

简明释义

英[ˈməʊləl]美[ˈmoʊləl]

adj. （重量）克分子的

英英释义

单词用法

同义词

反义词

例句

1.The molal concentration of a solute, usually expressed as the number of moles of solute per, 000 grams of solvent.

一种溶质的摩尔浓度，通常被表示作每，000克溶剂的摩尔数。

2.The molal concentration of a solute, usually expressed as the number of moles of solute per, 000 grams of solvent.

一种溶质的摩尔浓度，通常被表示作每，000克溶剂的摩尔数。

3.The molal concentration affects the boiling point elevation of the solvent.

溶剂的摩尔浓度影响其沸点升高。

4.The solution was prepared with a concentration of 1.5 molal in sodium chloride.

该溶液的氯化钠浓度为1.5摩尔浓度。

5.To calculate the freezing point depression, we need to know the molal concentration of the solute.

为了计算冰点降低，我们需要知道溶质的摩尔浓度。

6.In this experiment, we used a 2 molal solution of potassium nitrate.

在这个实验中，我们使用了2摩尔浓度的硝酸钾溶液。

7.We need to dilute the acid to achieve a molal solution for the titration.

我们需要稀释酸以获得用于滴定的摩尔浓度溶液。

作文

In the realm of chemistry, understanding various concepts is crucial for students and professionals alike. One such concept that often comes up in discussions about solutions is "molal". The term "molal" refers to a way of expressing the concentration of a solution. Specifically, it indicates the number of moles of solute per kilogram of solvent. This measurement is particularly useful when dealing with colligative properties, which depend on the number of particles in a solution rather than the identity of the solute itself.To illustrate the significance of "molal", consider a scenario where a chemist is preparing a saltwater solution. If the chemist wants to create a solution with a specific concentration, they might measure out a certain number of moles of salt and then dissolve it in a precise amount of water. The concentration can be expressed in molarity, but using "molal" provides a different perspective that can be more applicable in certain situations, especially when temperature changes occur.One key advantage of using "molal" is that it remains constant regardless of temperature fluctuations. This is because the mass of the solvent (in kilograms) does not change with temperature, while the volume of the solution can vary. Therefore, when conducting experiments that involve temperature variations, chemists often prefer to use "molal" to ensure that their calculations remain accurate.Moreover, the concept of "molal" is essential in understanding phenomena such as boiling point elevation and freezing point depression. These colligative properties are directly related to the number of solute particles in a given mass of solvent. For example, adding a solute to a solvent increases its boiling point and decreases its freezing point. By calculating the "molal" concentration of the solution, chemists can predict how much the boiling or freezing points will change.In practical applications, the importance of "molal" can be seen in various fields, including pharmaceuticals, food science, and environmental studies. In pharmaceuticals, for instance, the effectiveness of a drug can depend on its concentration in a solution. Knowing the "molal" concentration helps pharmacists prepare accurate dosages. Similarly, in food science, understanding the concentration of ingredients in a solution can affect flavor and preservation.In conclusion, the term "molal" is a fundamental concept in chemistry that represents the concentration of a solution in terms of moles of solute per kilogram of solvent. It is particularly valuable in scenarios involving temperature changes and colligative properties. By mastering the concept of "molal", students and professionals can enhance their understanding of chemical solutions and their behaviors, leading to more accurate and effective applications in various scientific fields.

在化学领域，理解各种概念对学生和专业人士来说至关重要。其中一个经常出现在溶液讨论中的概念是“molal”。术语“molal”指的是表达溶液浓度的一种方式。具体而言，它表示每千克溶剂中溶质的摩尔数。当处理与溶液中粒子数量相关的性质时，这种测量尤其有用，而不是溶质本身的身份。为了说明“molal”的重要性，考虑一个化学家准备盐水溶液的场景。如果化学家想要创建具有特定浓度的溶液，他们可能会称出一定数量的盐的摩尔数，然后将其溶解在精确量的水中。浓度可以用摩尔浓度表示，但使用“molal”提供了不同的视角，在某些情况下更为适用，特别是在温度变化发生时。使用“molal”的一个关键优势是，它在温度波动下保持不变。这是因为溶剂的质量（以千克计）不会随着温度变化而变化，而溶液的体积可能会变化。因此，在进行涉及温度变化的实验时，化学家通常更喜欢使用“molal”，以确保他们的计算保持准确。此外，“molal”的概念对于理解沸点升高和冰点降低等现象至关重要。这些与溶液中溶质粒子数量直接相关的性质。例如，向溶剂中添加溶质会提高其沸点并降低其冰点。通过计算溶液的“molal”浓度，化学家可以预测沸点或冰点将变化多少。在实际应用中，“molal”的重要性在制药、食品科学和环境研究等各个领域都能看到。例如，在制药行业，药物的有效性可能取决于其在溶液中的浓度。了解“molal”浓度有助于药剂师准备准确的剂量。同样，在食品科学中，理解溶液中成分的浓度会影响风味和保存。总之，术语“molal”是化学中的一个基本概念，表示以每千克溶剂中溶质的摩尔数表示的溶液浓度。它在涉及温度变化和与粒子数量相关的性质的场景中特别有价值。通过掌握“molal”的概念，学生和专业人士可以增强对化学溶液及其行为的理解，从而在各个科学领域实现更准确和有效的应用。