This paper introduces the commonly used solution preparation methods in the laboratory. HUMGINE is a professional manufacturer of laboratory instruments including test chambers, high and low temperature test chambers, constant temperature and humidity test chambers, drying ovens, vacuum boxes, moisture-proof boxes, ovens, incubators, etc. .
Water is the most commonly used solvent in chemical experiments. The water generally used is distilled water or deionized water. A solution which usually does not specify a solvent is an aqueous solution. The water used in the experiments in this book is distilled water or deionized water treated by electrodialysis.
When preparing the solution, firstly, according to the experimental requirements, different grades of reagents are selected; according to the concentration and quantity of the two solutions, the amount of the reagent is calculated and dissolved by adding water. The outer wall of the prepared solution container should be labeled with the name, concentration and date of preparation.
1. General solution preparation
(1) Prepared with solid reagent
Weigh the appropriate amount of solid reagent with a platform scale and dissolve it in the most suitable water (for easy hydrolysis of the salt, the shell U needs to add an appropriate amount of acid to inhibit hydrolysis), if necessary, with a small fire to help dissolve. After dissolving and cooling, transfer to a reagent bottle, dilute to the required volume, and shake to stand.
When preparing a saturated solution, the amount of reagent used should be slightly more than the calculated amount, dissolved and cooled by heating, and used after crystallization.
(2) Prepared with liquid reagent
The appropriate amount of liquid reagent is taken in the measuring cylinder, and slowly added to the appropriate amount of water, (oven manufacturer) to stir, if it is exothermic, it needs to be cooled to room temperature. Transfer to the reagent bottle, dilute to the required volume, shake and set aside.
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