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[Chemical Knowledge]：How to prepare 0.05mol l sodium hydroxide

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0.05mol/L of sodium hydroxide with

sodium hydroxide is a very strong base, it can be used as the preparation of other compounds, and acidic solution. When we need to use 0.05mol/L sodium hydroxide, we need to prepare. In this article, we will introduce in detail the preparation method and precautions of 0.05mol/L sodium hydroxide.

First, understand the definition of 0.05mol/L sodium hydroxide. Mol is the unit of stoichiometry, which indicates the number of moles of a substance. It is related to the mass of the substance and is equal to the mass of a substance divided by its molar mass. Taking sodium hydroxide as an example, the molar mass of sodium hydroxide is 40.0g/mol, so that 0.05mol of sodium hydroxide has a mass of 2.0 grams.

The method of preparing 0.05mol/L sodium hydroxide is as follows:

1. Raw material preparation

sodium hydroxide solid: We need 2.0 grams of sodium hydroxide solid. Note that when storing sodium hydroxide solid, it should be sealed to prevent it from absorbing moisture in the air and becoming sodium hydroxide, because sodium hydroxide is not a suitable neutralizing agent.

purified water: We need enough purified water to prepare 0.05mol/L sodium hydroxide. Choose good quality distilled water or pure water to avoid exposure to the air, especially in an environment with high air humidity.

2. configure sodium hydroxide solution

sodium hydroxide solid dissolved in pure water, make it completely dissolved. It is best to use a volumetric flask to prepare the solution. After adding an appropriate amount of purified water, gently shake the agar bottle hook to fully dissolve the sodium hydroxide and wait for the solution temperature to drop to room temperature.

When preparing 0.05mol/L sodium hydroxide, it is necessary to accurately calculate the required solution volume, which may require parameters such as molecular mass, material density, and required concentration. In general, one liter of 0.05mol/L sodium hydroxide solution can be prepared, using 2.0g of sodium hydroxide solid, adding about 900 ml of purified water, stirring to dissolve, and then adding the solution to 1 liter. The 0.05mol/L sodium hydroxide solution prepared by

should be kept in a dry, cool and ventilated place to avoid concentration change or sodium hydroxide solid formation due to water evaporation or absorption of moisture in the air.

In addition, you need to pay attention to the following points:

1. During the preparation process, you must wear gloves, goggles and other protective equipment to avoid accidents.

2. The prepared sodium hydroxide solution is a strong alkaline substance and must be stored in a suitable container and labeled for subsequent use.

3. Be careful when using sodium hydroxide, do not directly contact the skin to avoid chemical burns.