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[Chemical Knowledge]：Correct steps and precautions for the preparation of zinc standard solution

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Zinc standard solution is an important reagent commonly used in laboratories and is used in many chemical experiments. The correct preparation of zinc standard solution is not only related to the accuracy of experimental results, but also related to the safety of laboratory personnel. Therefore, in the preparation of zinc standard solution need to pay attention to some important matters, the following we will introduce in detail.

ensures that the zinc metal powder used is of high purity and free of impurities.

need to pay attention to the safety regulations of the laboratory during the preparation process, wear protective glasses and gloves to avoid damage to the skin and eyes. Next, an appropriate zinc salt and solvent are selected according to the concentration to be used, and zinc chloride, zinc nitrate and the like are commonly used. When preparing the solution, it is necessary to dissolve the zinc salt in the solvent in strict accordance with the ratio, and stir until it is completely dissolved. Subsequently, use the analytical scale to weigh the appropriate amount of zinc salt solution, transfer to a constant volume bottle, and add deionized water to the constant volume to the scale line under the accuracy requirements of the final volume. Note that in the preparation process to record each step of the operation and the use of pharmaceutical specifications and quantity, for subsequent inspection.

seal the constant volume flask, shake well and then calibrate it. If dilution is required, it should be carried out in strict accordance with the specified procedures.

zinc standard solution needs to be calibrated before use to ensure its accuracy. The above is the preparation of zinc standard solution matters needing attention, hoping to be helpful to everyone.

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