Sodium chloride standard solution

The standard sodium chloride solution is prepared by adding 0.165 grams of sodium chloride to a 1000 ml volumetric flask and shaking it well to use as the stock solution. The preparation method of sodium chloride standard solution is also relatively simple. It mainly includes direct preparation method and indirect preparation method. In addition, attention should be paid to the usual storage method. Operators must undergo strict training and strictly abide by the corresponding operating procedures. Let us learn about this aspect below.

Sodium chloride standard solution

Standard sodium chloride solution (10ug CL/ml): Weigh 0.165g of sodium chloride burned at 500℃-600℃, place in a 1000ml volumetric flask, add appropriate amount of water to dissolve and dilute to the scale, shake well, and use as the stock solution.

Before use, accurately measure 10 ml of the stock solution, place it in a 100 ml volumetric flask, add water to dilute to the scale, shake well, and you are done.

How to prepare sodium chloride standard solution

It is relatively simple to directly prepare with sodium chloride standard reagent. The sample weight is calculated according to the following formula: C*V=m/M

Where: C - concentration of sodium chloride standard solution, mol/L;

V——the volume of the prepared sodium chloride standard solution, L;

m——Weigh the mass of sodium chloride standard reagent, g;

M – molar mass of sodium chloride, 58.442 g/mol.

For example: prepare 1L of 0.1000mol/L sodium chloride standard solution. 0.1000*1=m/58.442 m=5.8442g

Preparation method: Weigh 5.8442g of sodium chloride standard reagent that has been burned to a constant amount at 500-600 degrees Celsius, add appropriate amount of distilled water to dissolve, transfer to a 1000ml volumetric flask, dilute to the scale and shake well.

【1】Direct preparation method: Determine the volume and concentration of the standard solution; calculate and weigh the standard sodium chloride reagent, dissolve the sample in distilled water, and transfer it to a volumetric flask to make up the volume.

【2】Indirect preparation method: First use analytical grade sodium chloride to prepare a solution of a certain concentration, then calibrate it with standard silver nitrate solution to calculate its exact concentration.

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Notes for operation: Operate in a closed environment with enhanced ventilation. Operators must undergo special training and strictly abide by operating procedures. It is recommended that operators wear self-priming filter dust masks, chemical safety glasses, anti-toxic penetration work clothes, and rubber gloves. Avoid generating dust. Avoid contact with oxidizing agents. Be careful when loading and unloading to prevent damage to the packaging and containers. Equipped with leakage emergency treatment equipment. Empty containers may contain hazardous residues.

Storage precautions: Store in a cool, ventilated warehouse. Keep away from fire and heat sources. It should be stored separately from oxidants and should not be mixed. The storage area should be equipped with suitable materials to contain leaks.