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Acids can be classified into two groups. Acids which always contain the
element carbon are called organic acids and they often come from growing things, like fruit. Citric acid, which is found in lemons and oranges and other citrus fruits, andacetic acid, which is found in vinegar, are organic acids. Acids which do not contain the element carbon are known as inorganic acids. They are usually prepared from non-living matter. Inorganic acids consist only of hydrogen and an acid radical. Hydrochloric acid consists of hydrogen and the chloride radical, and sulphuric acid consists of hydrogen and the sulphate radical. They are inorganic acids.