【Daily Question】Chemical Engineering Principles 335: Using Stored Standard Solutions (March 7)
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1. The container should be labeled with the name of the solution, its concentration, and the date of preparation. 2. Solutions that are prone to deterioration or changes in concentration due to light should be stored in brown bottles to protect them from light. 3. Those whose concentration is prone to change upon contact with air must be calibrated regularly. 4. Standard solutions that have passed their expiration date or have undergone changes in appearance shall not be used continuously.
What should be noted when using and storing standard solutions? Answer: 1. The container should be labeled with the name of the solution, its concentration, and the date of preparation. 2. Solutions that are prone to deterioration or changes in concentration due to light should be stored in brown bottles to protect them from light. 3. Those whose concentration changes easily upon contact with air should be calibrated regularly. 4. Standard solutions that have passed their expiration date or have undergone changes in appearance must not be used continuously.
Make sure the bottle is tightly sealed and avoid direct sunlight
The following points should be noted when using and storing test solutions: (1) Alkaline test solutions and concentrated salt solutions should not be stored in ground-glass bottles, as this can prevent the stopper from being removed easily once it adheres to the bottle mouth. (2) The name of the reagent, its concentration, the date of preparation, the person who prepared it, the expiration date, and other relevant information should be indicated on the label of the prepared solution. (3) Some standard solutions may deteriorate due to chemical reactions or microbial action; proper storage and regular calibration are necessary. Some test solutions are prone to deterioration when exposed to sunlight, and such solutions should be stored in brown bottles. (4) Reagent bottles containing test solutions should be placed in a solution cabinet or on a shelf that is protected from direct sunlight, with glass doors in place to prevent dust from accumulating on the bottle mouths and causing contamination. (5) Heat-generating devices should not be placed near the test solution bottles, as this could cause the solutions to deteriorate. (6) Water droplets often form on the inner wall of the bottle above the liquid level; the bottle should be shaken before use to mix these droplets with the solution. (7) Pipettes used to draw up test solutions should be cleaned and dried beforehand. When used multiple times or continuously, they should be stored properly after each use to avoid contamination; they must not be left lying on the table or poured back into the bottle. (8) When several test solutions stored in the same container are needed at the same time, especially when multiple people are working on the same surface, care must be taken to ensure that the stoppers are not placed incorrectly, thereby preventing cross-contamination. (9) When testing the same batch of samples and comparing the analysis results, reagents of the same batch number should be used. Toxic solutions must be managed carefully according to regulations; they must not be discarded carelessly down the drain
1. The container should be labeled with the name of the solution, its concentration, and the date of preparation. 2. Solutions that are prone to deterioration or changes in concentration due to light should be stored in brown bottles to protect them from light. 3. Those whose concentration changes easily upon contact with air need to be calibrated regularly. 4. Standard solutions that have passed their expiration date or have undergone changes in appearance must not be used continuously.
1. The container should be labeled with the name of the solution, its concentration, and the date of preparation. 2. Solutions that are prone to deterioration or changes in concentration due to light should be stored in brown bottles to protect them from light. 3. Those whose concentration changes easily upon contact with air should be calibrated regularly. 4. Standard solutions that have passed their expiration date or have undergone changes in appearance must not be used continuously.
What should be noted when using and storing standard solutions? Answer: 1. The container should be labeled with the name of the solution, its concentration, and the date of preparation. 2. Solutions that are prone to deterioration or changes in concentration due to light should be stored in brown bottles to protect them from light. 3. Those whose concentration changes easily upon contact with air should be calibrated regularly. 4. Standard solutions that have passed their expiration date or have undergone changes in appearance must not be used continuously.
What should be noted when using and storing standard solutions? Answer: 1. The container should be labeled with the name of the solution, its concentration, and the date of preparation. 2. Solutions that are prone to deterioration or changes in concentration due to exposure to light should be stored in brown bottles to protect them from light. 3. Solutions whose concentration can change upon contact with air need to be calibrated regularly. 4. Standard solutions that have passed their expiration date or have undergone changes in appearance should not be used continuously