back titration

简明释义

回滴定

英英释义

例句

1.The back titration method is particularly useful when the endpoint of a direct titration is difficult to observe.

当直接滴定的终点难以观察时，反滴定方法特别有用。

2.Using back titration, we were able to determine the purity of the sample more effectively.

通过使用反滴定，我们能够更有效地确定样品的纯度。

3.During the experiment, the students learned how to apply back titration for complexometric analysis.

在实验过程中，学生们学习了如何将反滴定应用于络合物分析。

4.In the laboratory, we used back titration to determine the concentration of an unknown acid solution.

在实验室中，我们使用反滴定来确定未知酸溶液的浓度。

5.We performed a back titration to accurately measure the amount of calcium carbonate in the sample.

我们进行了反滴定以准确测量样品中碳酸钙的含量。

作文

Back titration is a valuable analytical technique used in chemistry to determine the concentration of a substance in a solution. It involves adding a known amount of reagent to react with the analyte, and then titrating the excess reagent with another solution. This method is particularly useful when the analyte is not easily titrated directly or when it is present in a complex mixture. The process begins by carefully measuring a sample containing the analyte of interest, which could be an acid or a base. A known excess of a standard reagent is added, which reacts completely with the analyte. After the reaction has gone to completion, the remaining unreacted reagent is then titrated with a second solution of known concentration. By calculating the amount of reagent that reacted with the analyte, chemists can determine the concentration of the analyte in the original sample.One of the primary advantages of back titration (反滴定) is its ability to provide accurate results even when the direct titration is challenging. For instance, some substances may not have a clear endpoint during titration, making it difficult to ascertain when the reaction is complete. In such cases, back titration (反滴定) offers a reliable alternative. Additionally, this technique can be applied in various fields, including environmental analysis, pharmaceuticals, and food chemistry, where precise measurements are crucial.In practice, performing a back titration (反滴定) requires careful planning and execution. The choice of reagents is critical; they must react selectively with the analyte to avoid interference from other components in the mixture. Furthermore, the stoichiometry of the reactions involved must be well understood to accurately calculate the concentration of the analyte. The first step involves adding a known excess of the titrant to the sample, which ensures that all of the analyte reacts. Once the reaction is complete, the excess titrant is measured through a second titration with a standard solution.Another important aspect of back titration (反滴定) is the calculation of results. The initial amount of titrant added, along with the volume of the titrant used in the second titration, allows for the determination of how much of the analyte was present in the original sample. This information is crucial in various applications, such as determining the purity of a substance or assessing the concentration of pollutants in environmental samples.In summary, back titration (反滴定) is an essential technique in analytical chemistry that provides a practical solution for determining the concentration of difficult-to-titrate substances. Its versatility and accuracy make it a preferred choice in many laboratory settings. By understanding the principles and applications of back titration (反滴定), chemists can enhance their analytical skills and contribute to advancements in various scientific fields. The technique not only underscores the importance of methodological rigor in chemistry but also highlights the creativity required to solve complex analytical problems.