Final answer:
Quality-control tests are performed daily in laboratories to ensure the safety of chemicals and prevent accidents. These tests help verify the purity, concentration, stability, and compatibility of chemicals.
Step-by-step explanation:
The main reason quality-control tests are performed daily in laboratories is to ensure the safety of chemicals. By regularly testing the quality of chemicals used in experiments, labs can minimize the risk of accidents and ensure accurate results. These tests also help identify any faulty or contaminated chemicals that could affect the outcome of experiments.
Examples of quality-control tests include checking the purity of chemicals, measuring their concentration, and verifying their stability and compatibility with other substances. These tests contribute to maintaining a safe and controlled laboratory environment, protecting both the researchers and the experiments being conducted.