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[Chemical Knowledge]：Do you really understand the difference between anhydrous grade and analytical grade?

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Anhydrous grade and analytical purity are two kinds of reagents commonly used in chemical experiments, and they are very different in purity and use. Anhydrous reagent refers to the purity level of the compound containing almost no water, and is usually used in experiments requiring strict control of the moisture content. Analytically pure reagents, on the other hand, are high purity reagents used in analytical chemistry experiments in order to avoid the influence of other impurities on the experimental results.

anhydrous reagents are widely used in water-sensitive experiments because of their low water content. For example, in certain organic syntheses, even a trace amount of moisture may affect the progress of the reaction and the yield of the product. At this time, the choice of anhydrous grade reagent can ensure the purity of the reaction and the stability of the yield.

In contrast, analytically pure reagents require higher purity. They are rigorously prepared and tested to provide high-purity chemicals for use in a variety of analytical experiments. Analytical reagents usually do not contain any impurities that interfere with experimental results and can provide reliable data. In analytical chemistry, commonly used analytical pure reagents include analytical pure acid, analytical soda ash, analytical pure solution, etc.

In addition, there is a gap between the price of anhydrous reagents and analytical reagents. The cost of analytically pure reagents is usually higher due to their different preparation processes and purification methods. Therefore, when selecting reagents, decisions need to be made according to the specific requirements of the experiment and the budget.

To sum up, there are obvious differences in purity and use between anhydrous reagents and analytical reagents. Anhydrous reagents are suitable for water-sensitive experiments, while analytically pure reagents are suitable for analytical experiments that require high purity and reliable data. Understanding these differences can help chemical laboratory personnel to better choose suitable reagents, improve the accuracy and reliability of the experimental results.

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