gravimetric titration

简明释义

重量滴定

英英释义

例句

1.The results from the gravimetric titration 重量滴定 were consistent with those obtained from volumetric methods.

来自重量滴定 gravimetric titration的结果与体积法获得的结果一致。

2.We used gravimetric titration 重量滴定 to analyze the purity of the chemical compound.

我们使用重量滴定 gravimetric titration分析化合物的纯度。

3.In a chemistry lab, we performed a gravimetric titration 重量滴定 to determine the concentration of an unknown solution.

在化学实验室，我们进行了一个重量滴定 gravimetric titration以确定未知溶液的浓度。

4.During the gravimetric titration 重量滴定, we carefully weighed the precipitate to calculate the analyte concentration.

在重量滴定 gravimetric titration过程中，我们仔细称量沉淀以计算分析物浓度。

5.The gravimetric titration 重量滴定 method is highly accurate for measuring the amount of precipitate formed.

该重量滴定 gravimetric titration方法对于测量形成的沉淀量非常准确。

作文

Gravimetric titration is a quantitative analytical technique used to determine the concentration of a particular substance in a solution by measuring the mass of a solid precipitate that forms during the reaction. This method is widely employed in chemistry due to its accuracy and reliability. In essence, gravimetric titration (重量滴定) involves the gradual addition of a titrant to a sample until the reaction reaches completion, indicated by the formation of a stable precipitate. The mass of this precipitate can then be measured to calculate the concentration of the analyte in the original solution.The process begins with the preparation of the solution containing the analyte. It is crucial to ensure that the sample is free from impurities that could affect the results. Once the sample is prepared, a titrant is selected based on the chemical reaction involved. For example, if we are analyzing chloride ions in a solution, we might use silver nitrate as the titrant, which reacts with the chloride ions to form silver chloride, a solid precipitate.During the gravimetric titration (重量滴定), the titrant is slowly added to the analyte solution while continuously stirring. It is important to monitor the progress of the reaction closely, often using indicators or pH meters to determine when the endpoint is reached. The endpoint signifies that all the analyte has reacted with the titrant, resulting in the formation of the precipitate.Once the endpoint is reached, the mixture is filtered to separate the precipitate from the solution. The precipitate is then washed to remove any impurities or excess reactants, and it is dried to obtain a constant mass. The mass of the dried precipitate is measured accurately using an analytical balance. This measurement is critical, as it directly influences the calculation of the analyte's concentration.To calculate the concentration of the analyte, one must apply stoichiometric principles, considering the balanced chemical equation for the reaction. By knowing the molar mass of the precipitate and the amount of titrant used, one can determine the number of moles of the analyte present in the original solution. This information allows chemists to derive the concentration of the analyte in terms of molarity or other units.One of the key advantages of gravimetric titration (重量滴定) is its high level of precision. Unlike volumetric titrations, which rely on measuring liquid volumes, gravimetric methods minimize errors associated with liquid measurements. Additionally, the formation of a solid precipitate provides a clear visual indicator of the reaction's completion, making it easier to identify the endpoint.However, there are limitations to consider when using gravimetric titration (重量滴定). Not all reactions produce a suitable precipitate, and some precipitates may be difficult to filter or may dissolve in the washing process. Moreover, the technique can be time-consuming, requiring careful handling and multiple steps to ensure accurate results.In conclusion, gravimetric titration (重量滴定) is a fundamental method in analytical chemistry that offers precision and reliability for determining the concentration of substances in solution. By understanding the principles and procedures involved, chemists can effectively utilize this technique to achieve accurate analytical results in various applications, from environmental testing to pharmaceuticals and beyond.