The instructions below are only good for concentrated Hydrochloric from
35-38% solution with a specific gravity of 1.18 and a molar mass of 36.46 g/mol.
The concentration of Hydrochloric acid decreases over a long period of time; as the gas diffuses into the atmosphere. It is advisable to keep stocks in secured glass containers and should be kept properly inside the laboratory. It is best to store them in an outside stock room if there is any in your school.
Do not attempt diluting Hydrochloric acid if it is your first. Ask a colleague or from a more experienced laboratory staff to help you. Do not allow students to dilute concentrated solutions, but you can demonstrate this in the science laboratory in order for them to understand the procedure correctly. However, you may ask them to dilute further diluted solution from 1M and lower.
