In addition to being the acid present in your own stomach, Hydrochloric acid (HCl) has many other uses.
HCl is commonly used to adjust the pH (level of acidity) of solutions. For example, HCl is added to swimming pools when the pool pH is too high (too basic).
HCl is a powerful cleaner. Cement, ceramic and metal items can be cleaned with hydrochloric acid. Although the HCl is normally diluted in water first. The final concentration depends on the material being cleaned.
HCl is also used extensively in the food industry. Sometimes it is used to simply adjust the pH of certain foods. But HCl can also be used to process food ingredients, such as acid-hydrolyzed protein (protein broken down into the individual amino acids - a component of infant formula and bouillon).
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