chemical indicator

简明释义

化学指示剂

英英释义

例句

1.Some chemical indicators 化学指示剂 can be used to detect the presence of heavy metals in water.

一些化学指示剂 化学指示剂可用于检测水中重金属的存在。

2.In titration experiments, phenolphthalein acts as a chemical indicator 化学指示剂 to show when the solution reaches neutral.

在滴定实验中，酚酞作为化学指示剂 化学指示剂，显示溶液何时达到中性。

3.The color change in the litmus paper serves as a chemical indicator 化学指示剂 for the presence of acids or bases.

石蕊纸的颜色变化作为化学指示剂 化学指示剂，表明酸或碱的存在。

4.The pH test strips are a common type of chemical indicator 化学指示剂 used to measure acidity.

pH试纸是一种常见的化学指示剂 化学指示剂，用于测量酸度。

5.A colorimetric assay often employs a chemical indicator 化学指示剂 to quantify the concentration of a substance.

比色法通常使用化学指示剂 化学指示剂来量化物质的浓度。

作文

In the world of science, particularly in chemistry, understanding various concepts and tools is essential for conducting experiments and analyzing results. One such important concept is the chemical indicator, which plays a crucial role in determining the presence or concentration of specific substances in a solution. A chemical indicator is a substance that undergoes a distinct change in color or physical state when it reacts with certain chemicals. This property makes it invaluable in various applications, including titrations, pH measurements, and even in everyday products like pH test strips used in swimming pools or aquariums.To illustrate the importance of chemical indicators, consider the classic experiment involving the acid-base titration. In this process, a strong acid is gradually added to a base until the reaction reaches its endpoint. The endpoint is often indicated by a sudden change in color, which is made possible by the use of a chemical indicator. For example, phenolphthalein is a common chemical indicator used in titrations. It remains colorless in acidic solutions but turns pink in basic solutions. When the titration reaches the endpoint, the solution changes from pink to colorless, signaling that the acid has neutralized the base. This visual cue allows chemists to determine the exact point at which the reaction occurs.Another significant application of chemical indicators is in measuring pH levels. pH is a scale that measures how acidic or basic a solution is, and it is vital in many fields, including biology, environmental science, and medicine. Various chemical indicators can be used to measure pH, each with its own specific range. For instance, litmus paper is a well-known chemical indicator that turns red in acidic solutions and blue in alkaline solutions. This simple yet effective method allows individuals to quickly assess the acidity or alkalinity of a solution without needing sophisticated equipment.Moreover, chemical indicators are not limited to laboratory settings. They are widely used in various industries and daily life. For instance, in food safety, certain chemical indicators can indicate whether food has been stored at safe temperatures. These indicators change color when exposed to temperatures that could promote bacterial growth, thus ensuring consumer safety. Similarly, in healthcare, chemical indicators are used in sterilization processes to confirm that surgical instruments have been adequately sterilized, preventing infections during medical procedures.In conclusion, chemical indicators are essential tools in both scientific research and practical applications. Their ability to provide immediate visual feedback on chemical reactions or conditions makes them indispensable in various fields. Whether in a chemistry lab, a food production facility, or a healthcare setting, the role of chemical indicators cannot be overstated. Understanding how to utilize these indicators effectively can lead to more accurate results and safer practices, highlighting the significance of this fascinating aspect of chemistry.

在科学界，特别是在化学中，理解各种概念和工具对于进行实验和分析结果至关重要。其中一个重要的概念是化学指示剂，它在确定溶液中特定物质的存在或浓度方面发挥着至关重要的作用。化学指示剂是一种在与某些化学物质反应时会发生明显颜色或物理状态变化的物质。这一特性使其在多种应用中变得不可或缺，包括滴定、pH测量，甚至在日常产品中，如用于游泳池或水族馆的pH试纸。为了说明化学指示剂的重要性，可以考虑经典的酸碱滴定实验。在这个过程中，将强酸逐渐加入到碱中，直到反应达到终点。终点通常通过颜色的突然变化来指示，这得益于使用了化学指示剂。例如，酚酞是一种常用的化学指示剂，在酸性溶液中保持无色，但在碱性溶液中变为粉红色。当滴定达到终点时，溶液从粉红色变为无色，表明酸已中和碱。这种视觉提示使化学家能够确定反应发生的确切时刻。化学指示剂的另一个重要应用是在测量pH值方面。pH是衡量溶液酸性或碱性的一个尺度，在生物学、环境科学和医学等许多领域都至关重要。可以使用各种化学指示剂来测量pH，每种指示剂都有其特定的范围。例如，石蕊试纸是一种著名的化学指示剂，在酸性溶液中变红，在碱性溶液中变蓝。这种简单而有效的方法使个人能够快速评估溶液的酸性或碱性，而无需复杂的设备。此外，化学指示剂并不限于实验室环境。它们在各个行业和日常生活中被广泛使用。例如，在食品安全中，某些化学指示剂可以指示食品是否在安全温度下存放。这些指示剂在暴露于可能促进细菌生长的温度时会改变颜色，从而确保消费者的安全。同样，在医疗保健中，化学指示剂用于灭菌过程，以确认外科器械是否已充分灭菌，从而防止手术过程中的感染。总之，化学指示剂是科学研究和实际应用中不可或缺的工具。它们提供对化学反应或条件的即时视觉反馈，使其在各个领域中不可或缺。无论是在化学实验室、食品生产设施还是医疗保健环境中，化学指示剂的作用都不容小觑。有效利用这些指示剂的能力可以导致更准确的结果和更安全的实践，突显了这一化学迷人方面的重要性。