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1. stoichiometry - (chemistry) the relation between the quantities of substances that take part in a reaction or form a compound (typically a ratio of whole integers).
The equivalence point, or stoichiometric point, of a chemical reaction is the point at which chemically equivalent quantities of bases and acids have been mixed. In other words, the moles of acid are equivalent to the moles of base, according to the equation. It can be found by means of an indicator, for example phenolphthalein or methyl orange. The endpoint refers to the point at which the indicator changes colour in a colourimetric titration.