Chemicals should always be stored in separate areas that are well ventilated and well away from any major source of heat, because some chemicals react to heat and may explode.
Always make sure chemicals are labelled clearly, and follow the instructions for storage.
Be very careful when transferring chemicals into other containers and always make sure the new container is labelled.
Chemicals should never be stored near food or beverages. They should not even be stored near paper products. Paper can absorb chemicals and dry. If the paper is then used for service of food and drink, this can be dangerous for all concerned.
Chemicals should never be mixed as this may cause an explosion and injury.