Quantitative Determination of Water in Salt HydratesThe protons of the water molecules in many metal-, ammonium-, and hydrazonium salt hydrates can be determined quickly and under mild conditions with the help of triethylborane that has been activated by small amounts of pivalic acid .This standard method is suitable for neutral salts of the main group metals such as the alkali and alkaline earth metal halides, sulfides, sulfates, carbonates, and chromates as well as for chlorides, bromides, and sulfates of several transition metals such as iron, cobalt, and nickel. -Interfering reactions such as complex salt formation and redox reactions and possible ways of avoiding them are discussed. The acidic hydrogens of acidic and basic metal salts, of the hydroxy groups in alkali and alkaline earth hydroxides and a few NHdQ salts may be quantitatively determined using modified procedures with e. g. pure diethylboryl pivalate or with a mixture of triethylborane/chlorodipropylborane. -The storability of metal salt hydrates e. g. of sodium sulfate, sodium carbonate, and of various alums as well as the stepwise dehydration of salts can be easily assessed using this method. -The preparative dehydration of certain metal salt hydrates is illustrated by examples. *) Korrespondenz bitte an diesen Autor richten.