potentiometric titration

简明释义

酚酞滴定

英英释义

例句

1.In the laboratory, we performed a potentiometric titration (电位滴定) to determine the concentration of acetic acid in vinegar.

在实验室，我们进行了一个potentiometric titration（电位滴定）来测定醋中醋酸的浓度。

2.The potentiometric titration (电位滴定) method is preferred for its accuracy in measuring pH changes.

由于其在测量pH变化方面的准确性，potentiometric titration（电位滴定）方法更受欢迎。

3.We used a glass electrode during the potentiometric titration (电位滴定) of sulfuric acid with sodium hydroxide.

在用氢氧化钠对硫酸进行potentiometric titration（电位滴定）时，我们使用了玻璃电极。

4.During the potentiometric titration (电位滴定), we observed a sharp change in voltage at the equivalence point.

在potentiometric titration（电位滴定）过程中，我们观察到在当量点处电压发生了急剧变化。

5.The results from the potentiometric titration (电位滴定) were plotted on a graph to visualize the endpoint.

从potentiometric titration（电位滴定）获得的结果被绘制在图表上以可视化终点。

作文

In the field of analytical chemistry, various techniques are employed to determine the concentration of an unknown solution. One such method is called potentiometric titration, which is a highly effective and precise technique for analyzing the properties of acids and bases. This method involves measuring the potential difference between two electrodes immersed in a solution as a titrant is added. The point at which the solution reaches neutrality or the desired pH level can be accurately determined by monitoring these changes in potential. The basic principle of potentiometric titration relies on the Nernst equation, which relates the concentration of ions in solution to the electric potential measured by the electrodes. During the titration process, a known concentration of titrant is gradually added to the analyte solution, and the resulting voltage change is recorded. This voltage change indicates how the concentration of the reactants changes until the equivalence point is reached. One of the significant advantages of potentiometric titration over traditional visual indicators is its ability to provide precise measurements without the subjective interpretation of color changes. This makes it particularly useful in situations where the endpoint of the titration may be difficult to discern visually, such as in solutions that are colored or turbid. Furthermore, because the method relies on electronic measurements, it allows for greater accuracy and repeatability in results. In practice, a typical potentiometric titration setup includes a reference electrode and an indicator electrode. The reference electrode maintains a constant potential, while the indicator electrode responds to changes in the solution's potential as the titrant is added. These electrodes are connected to a potentiometer or a similar device that records the potential changes. The data collected can then be plotted on a graph, with the volume of titrant added on the x-axis and the measured potential on the y-axis. This graph typically shows a distinct curve, with a sharp change in slope indicating the equivalence point. Applications of potentiometric titration are widespread in various fields, including environmental testing, food quality control, and pharmaceutical analysis. For instance, in the pharmaceutical industry, it is crucial to ensure that medications contain the correct concentrations of active ingredients. Potentiometric titration provides a reliable means to confirm these concentrations, ensuring both safety and efficacy for consumers. Similarly, in environmental studies, this technique can be used to assess the acidity of water samples, which is vital for understanding ecological health. In conclusion, potentiometric titration is an invaluable tool in analytical chemistry, offering precision and reliability in determining the concentration of unknown solutions. Its ability to eliminate the subjective nature of visual indicators makes it a preferred choice in many applications. As technology continues to advance, the methods and instruments used for potentiometric titration are likely to evolve, further enhancing the accuracy and efficiency of this important analytical technique.

在分析化学领域，采用各种技术来确定未知溶液的浓度。其中一种方法称为电位滴定，这是一种高效且精确的分析酸和碱性质的技术。该方法涉及在加入滴定剂时测量浸入溶液中的两个电极之间的电位差。通过监测这些电位变化，可以准确确定溶液达到中性或所需pH水平的点。

电位滴定的基本原理依赖于Nernst方程，该方程将溶液中离子的浓度与电极测量的电势相关联。在滴定过程中，逐渐向分析溶液中添加已知浓度的滴定剂，并记录随之而来的电压变化。此电压变化表明反应物的浓度如何变化，直到达到等效点。

相比传统的视觉指示剂，电位滴定的一个重要优势是能够提供精确的测量，而无需主观地解释颜色变化。这使得它在难以通过肉眼分辨滴定终点的情况下尤为有用，例如在有色或浑浊的溶液中。此外，由于该方法依赖于电子测量，它允许结果具有更高的准确性和重复性。

在实践中，典型的电位滴定设置包括参考电极和指示电极。参考电极保持恒定电位，而指示电极对随着滴定剂添加而变化的溶液电位作出反应。这些电极连接到一个电位计或类似设备，记录电位变化。收集的数据可以绘制成图，滴定剂的体积在x轴上，测得的电位在y轴上。该图通常显示出明显的曲线，斜率的急剧变化指示等效点。

电位滴定的应用广泛，涵盖环境测试、食品质量控制和药品分析等多个领域。例如，在制药行业，确保药物含有正确浓度的活性成分至关重要。电位滴定提供了一种可靠的方法来确认这些浓度，从而确保消费者的安全和有效性。同样，在环境研究中，这项技术可用于评估水样的酸度，这对理解生态健康至关重要。

总之，电位滴定是在分析化学中一项宝贵的工具，提供了确定未知溶液浓度的精确性和可靠性。它消除了视觉指示剂的主观性，使其在许多应用中成为首选。随着技术的不断进步，用于电位滴定的方法和仪器可能会不断演变，进一步提高这一重要分析技术的准确性和效率。