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Confused HCl: Hydrogen Chloride or Hydrochloric Acid?

Authors

  • Dr. Sathyanarayana Reddy Perumalla,

    1. Department of Pharmaceutics, College of Pharmacy, University of Minnesota, 9-127B Weaver-Densford Hall, 308 Harvard Street S.E. Minneapolis, MN 55455 (USA), Fax: (+1) 612-626-2125
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  • Dr. Changquan Calvin Sun

    Corresponding author
    1. Department of Pharmaceutics, College of Pharmacy, University of Minnesota, 9-127B Weaver-Densford Hall, 308 Harvard Street S.E. Minneapolis, MN 55455 (USA), Fax: (+1) 612-626-2125
    • Department of Pharmaceutics, College of Pharmacy, University of Minnesota, 9-127B Weaver-Densford Hall, 308 Harvard Street S.E. Minneapolis, MN 55455 (USA), Fax: (+1) 612-626-2125
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Abstract

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Hydrogen chloride can exist in various forms. Indiscriminative uses of the abbreviation “HCl” for its different forms has led to considerable confusion in the literature. The discovery of hidden solid forms of widely studied molecules by using different forms of hydrogen chloride highlights the need of clarifying the terminology surrounding hydrogen chloride in chemical research (see figure).

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