Ammonium hydrofluoride Ammonium difluoride Ammonium hydrogendifluoride == Structure == Ammonium bifluoride, as its name indicates, contains a bifluoride, or hydrogen(difluoride) anion: HF2−. This centrosymmetric triatomic anion features the strongest known hydrogen bond, with a F−H length of 114 pm. and a bond energy greater than 155 kJ mol−...
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http://en.wikipedia.org/wiki/Ammonium_bifluoride
a white, crystalline, water-soluble, poisonous solid, NHHF, used chiefly for cleaning and sterilizing brewing and dairy equipment.
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https://www.infoplease.com/dictionary/ammonium-bifluoride
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