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Description. Cobalt(II) chloride (CoCl 2) is the most common cobalt compound found in laboratories. The dramatic color change of blue-purple Cobalt(II) chloride to a rose color when hydrated makes CoCl 2 an excellent indicator for water in dessicants.
The most famous compound is H2O, which is combination of two molecules of hydrogen and one molecule of oxygen; commonly known as water. Another most commonly household compound table salt is identified by the formula of NaCl, which is combination of one molecule of sodium and one molecule of chlorine.