How is the solution typically prepared in a laboratory?
This article outlines the common methods for preparing solutions in laboratory settings. HUMGINE is a leading manufacturer of laboratory equipment, including test chambers, high and low temperature test chambers, constant temperature and humidity chambers, drying ovens, vacuum boxes, moisture-proof cabinets, incubators, and more.
Water is the most widely used solvent in chemical experiments, with distilled water or deionized water being the standard choices. When a solution does not specify a solvent, it is generally assumed to be an aqueous solution. In the experiments described in this book, distilled water or deionized water treated through electrodialysis is typically used.
When preparing a solution, the first step is to select the appropriate grade of reagents based on the experimental requirements. Then, calculate the required amount of the reagent and dissolve it in the appropriate volume of water. After preparation, label the container with the solution’s name, concentration, and date of preparation to ensure clarity and traceability.
1. General Solution Preparation
(1) Preparing from Solid Reagents
Weigh the required amount of solid reagent using a balance, then dissolve it in the appropriate type of water. For salts that tend to hydrolyze, add a small amount of acid to prevent this. If necessary, gently heat the solution to aid dissolution. Once fully dissolved and cooled, transfer the solution to a labeled reagent bottle, dilute to the desired volume, and shake well before storing.
For saturated solutions, use slightly more reagent than calculated. Dissolve by heating, allow to cool, and let crystals form before use.
(2) Preparing from Liquid Reagents
Measure the required volume of liquid reagent using a graduated cylinder, then slowly add it to water while stirring. If the reaction is exothermic, allow the mixture to cool to room temperature before proceeding. Transfer the solution to a reagent bottle, dilute to the correct volume, shake thoroughly, and set aside for use.
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