How do you properly dispose of chemicals not needed in the experiment?
Correct answer: D. Dispose of chemicals in proper places and follow posted procedures without returning them to their original containers.
- A. The rule is to add concentrated acid to water slowly.
- B. The rule is to add water to the concentrated acid slowly.
- C. Carefully replace unused or excess chemicals into their properly labeled containers from which they came.
- D. Dispose of chemicals in proper places and follow posted procedures without returning them to their original containers.
Explanation
Dispose of chemicals in proper places and follow posted procedures without returning them to their original containers. Unused or excess chemicals should not be returned to stock bottles to avoid contamination. They must be disposed of according to lab safety guidelines in designated waste containers. This ensures safety and prevents chemical reactions or accidents.
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About Experimental Techniques in Chemistry
Separation methods are selected according to differences in solubility, particle size, volatility and sublimation behaviour. Filtration and crystallisation separate insoluble or dissolved solids, sublimation isolates suitable volatile solids, distillation separates liquids by boiling point, and solvent extraction transfers a substance between immiscible solvents.
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