acid-base indicator

简明释义

酸碱指示剂;

英英释义

例句

1.The litmus paper is a common acid-base indicator 酸碱指示剂 that turns red in acidic solutions and blue in basic solutions.

石蕊纸是一种常见的酸碱指示剂 酸碱指示剂，在酸性溶液中变为红色，在碱性溶液中变为蓝色。

2.We added a few drops of acid-base indicator 酸碱指示剂 to the solution to observe the color change.

我们向溶液中加入几滴酸碱指示剂 酸碱指示剂以观察颜色变化。

3.Phenolphthalein is often used as an acid-base indicator 酸碱指示剂 because it changes color at a pH around 8.2.

酚酞通常作为酸碱指示剂 酸碱指示剂使用，因为它在pH值约为8.2时会变色。

4.When titrating, it's essential to choose the right acid-base indicator 酸碱指示剂 for accurate results.

在滴定时，选择正确的酸碱指示剂 酸碱指示剂以获得准确结果是至关重要的。

5.In a chemistry lab, we used a universal acid-base indicator 酸碱指示剂 to determine the pH of various solutions.

在化学实验室，我们使用了通用的酸碱指示剂 酸碱指示剂来确定各种溶液的pH值。

作文

In the world of chemistry, understanding the properties of substances is crucial for various applications. One important concept that plays a significant role in this field is the use of an acid-base indicator. An acid-base indicator is a substance that changes color in response to changes in pH levels, allowing scientists and students alike to determine whether a solution is acidic or basic. This property makes acid-base indicators invaluable tools in laboratories, educational settings, and even in everyday life. The function of an acid-base indicator is based on its chemical structure. Most indicators are weak acids or bases themselves, which partially dissociate in solution. The dissociation leads to a change in the ratio of the protonated to deprotonated form of the indicator, causing a visible color change. For instance, litmus paper, one of the most common acid-base indicators, turns red in acidic solutions (pH less than 7) and blue in basic solutions (pH greater than 7). There are several types of acid-base indicators available, each with its unique range of pH sensitivity. Some indicators, like phenolphthalein, are colorless in acidic solutions but turn pink in basic solutions, making them useful for titrations where a clear endpoint is desired. Other indicators, such as bromothymol blue, transition from yellow in acidic conditions to blue in alkaline conditions, providing a visual representation of pH changes. The choice of an acid-base indicator depends on the specific pH range that needs to be measured. For example, if a chemist is performing a titration that reaches a pH of around 8-10, phenolphthalein would be an appropriate choice due to its transition range. Conversely, if the reaction occurs in a more acidic environment, methyl orange, which changes from red to yellow between pH 3.1 and 4.4, might be more suitable. In addition to their laboratory applications, acid-base indicators also have practical uses in everyday life. For example, gardeners often use soil pH test kits that include acid-base indicators to determine the acidity or alkalinity of their soil. This information helps them choose the right plants for their garden and amend the soil accordingly to create a more favorable growing environment. Furthermore, some food products, such as pickles and fermented items, rely on the principles of acidity and basicity, where acid-base indicators can help monitor the fermentation process. In conclusion, acid-base indicators are essential tools in both scientific research and everyday applications. By changing color in response to pH variations, these indicators provide a simple yet effective means of determining the acidity or basicity of a solution. Their versatility allows them to be used in various fields, from chemistry to agriculture, demonstrating their importance in understanding and managing chemical properties. As we continue to explore the intricate world of chemistry, the role of acid-base indicators will undoubtedly remain significant, aiding in our quest for knowledge and practical solutions in diverse areas of life.

在化学的世界中，理解物质的性质对于各种应用至关重要。一个在这个领域中发挥重要作用的概念是使用酸碱指示剂。酸碱指示剂是一种在pH值变化时会改变颜色的物质，使科学家和学生能够确定溶液是酸性还是碱性。这一特性使得酸碱指示剂成为实验室、教育环境甚至日常生活中不可或缺的工具。酸碱指示剂的功能基于其化学结构。大多数指示剂本身是弱酸或弱碱，在溶液中部分解离。解离导致指示剂的质子化和去质子化形式的比例发生变化，从而引起可见的颜色变化。例如，石蕊试纸是最常见的酸碱指示剂之一，在酸性溶液中变为红色（pH小于7），在碱性溶液中变为蓝色（pH大于7）。有几种类型的酸碱指示剂可供选择，每种都有其独特的pH敏感范围。一些指示剂，如酚酞，在酸性溶液中无色，而在碱性溶液中变为粉红色，使其在需要明确终点的滴定中非常有用。其他指示剂，如溴酚蓝，在酸性条件下呈黄色，在碱性条件下呈蓝色，提供了pH变化的可视化表示。选择酸碱指示剂取决于需要测量的特定pH范围。例如，如果化学家进行的滴定达到约8-10的pH，酚酞将是合适的选择，因为它的转变范围。相反，如果反应发生在更酸性的环境中，甲基橙（在pH 3.1到4.4之间从红色变为黄色）可能更合适。除了实验室应用外，酸碱指示剂在日常生活中也有实际用途。例如，园丁常使用包含酸碱指示剂的土壤pH测试套件来确定土壤的酸碱性。这些信息帮助他们选择适合自己花园的植物，并相应地改良土壤，以创造更有利的生长环境。此外，一些食品产品，如腌菜和发酵食品，依赖于酸性和碱性的原理，其中酸碱指示剂可以帮助监测发酵过程。总之，酸碱指示剂是科学研究和日常应用中不可或缺的工具。通过对pH变化的颜色变化，这些指示剂提供了一种简单而有效的方法来确定溶液的酸性或碱性。它们的多功能性使它们可以在化学到农业等多个领域中使用，展示了它们在理解和管理化学性质方面的重要性。随着我们继续探索复杂的化学世界，酸碱指示剂的角色无疑将保持重要性，帮助我们在生活的各个领域寻求知识和实用解决方案。