Hydrochloric acid diluted to a 10% solution cannot be purchased in most communities. The best place to purchase commercially prepared solutions is from a laboratory supply company. Purchasing it ready-for-use is the recommended way to obtain it. Don’t try to prepare your own solution if you don’t know exactly what you are doing and have an equipped laboratory. Your chemistry department might be able to assist you with ordering acid. Some generous chemists will prepare a 10% solution for you.