Base (chemistry)

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In chemistry, a base is a substance that, in aqueous solution, is slippery tae the touch, tastes bitter, chynges the colour o indicators (e.g., turns reid litmus paper blue), reacts wi acids tae furm sauts, an promotes certain chemical reactions (base catalysis). Examples o bases are the hydroxides of the alkali an alkaline yird metals (NaOH, Ca(OH)2, etc). Such substances produce hydroxide ions (OH-) in aqueous solutions, an are thus classified as Arrhenius bases.