back titration

简明释义

回滴定

英英释义

例句

1.The researcher chose back titration 回滴定 to accurately measure the amount of unreacted reagent in the solution.

研究人员选择回滴定来准确测量溶液中未反应试剂的量。

2.To analyze the amount of calcium carbonate in a sample, we performed a back titration 回滴定 after adding an excess of hydrochloric acid.

为了分析样品中碳酸钙的含量，我们在加入过量盐酸后进行了回滴定。

3.In our chemistry class, we learned how to perform a back titration 回滴定 to find the concentration of acetic acid in vinegar.

在我们的化学课上，我们学习了如何进行回滴定以找出醋中醋酸的浓度。

4.In the laboratory, we often use back titration 回滴定 to determine the concentration of a substance that is difficult to measure directly.

在实验室中，我们经常使用回滴定来确定难以直接测量的物质浓度。

5.The back titration 回滴定 method is particularly useful when the endpoint of a direct titration is hard to identify.

当直接滴定的终点难以识别时，回滴定方法特别有用。

作文

Back titration is a valuable analytical technique used in chemistry to determine the concentration of a substance in a solution. This method is particularly useful when direct titration is not feasible due to the instability of the reactants or products involved. In a typical back titration process, an excess of a standard reagent is added to the analyte, which reacts with it completely. After this reaction, the unreacted excess reagent is titrated with another solution to find out how much of the reagent was left unreacted. This allows chemists to calculate the amount of the original substance present in the sample. Back titration (反滴定) is often preferred in situations where the endpoint of a direct titration is difficult to observe or when the reaction between the analyte and titrant is slow. For example, in the analysis of calcium carbonate in a sample, a common approach is to add hydrochloric acid to the sample to ensure complete reaction with the calcium carbonate. Once the reaction is complete, the excess hydrochloric acid is then titrated with sodium hydroxide to determine how much acid was not reacted. This indirect method provides accurate results and is widely used in various fields such as environmental science, pharmaceuticals, and food safety. The precision of back titration (反滴定) lies in its ability to circumvent some of the limitations faced in direct titration methods. One of the key advantages is that it can be applied to samples that may produce interfering substances during a direct titration, thus ensuring clearer results. Moreover, back titration (反滴定) can also be beneficial when working with solid samples, as it allows for the determination of the analyte without needing to dissolve it completely beforehand. Overall, mastering the technique of back titration (反滴定) is essential for any chemist who aims to conduct thorough and reliable quantitative analyses. By understanding the principles behind this method and practicing its application, chemists can enhance their analytical skills and contribute to more accurate scientific research.