The simplest acids are composed of just two elements. Such acids are called binary acids. When naming a binary acid, the prefix hydro-is used. The ending of the second element (the nonmetal) is changed to -icand the word “acid” is added. For example, the chemical formula for hydrochloric acid is HCl. HCl is made up of two elements— hydrogen and chlorine (a nonmetal). The H stands for the element hydrogen and the Cl stands for the element chlorine. To name this acid, add the prefix hydro-and change the ending of chlorine to -icand then add the word “acid.” The result is hydrochloric acid. Another example, hydrobromic acid, which has the chemical formula HBr, gets its name because it is made up of the elements hydrogen and bromine. Hydroiodic acid (HI) is an acid containing the elements hydrogen and iodine
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