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Tetramethylammonium hydroxide (TMAH or TMAOH) is a quaternary ammonium salt with the molecular formula N(CH3)4+ OH−. It is commonly encountered as concentrated solutions in water or methanol.
T 1460a (OTTO) Tetramethylammonium hydroxide, pentahydrate, 98% Cas 10424-65-4 - used in analytical chemistry as an ion pairing agent and a polarographic reagent.