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Naming Binary Acids
General Chemistry • Chemical Compounds
Frequently Asked Questions
How do you name a binary acid like HCl in water?
For aqueous solutions, use hydro + root of the nonmetal + ic acid. HCl(aq) is named hydrochloric acid.
Why is HCl(g) called hydrogen chloride but HCl(aq) is hydrochloric acid?
The acid name is used only when the compound is dissolved in water (aqueous), where it behaves as an acid. In the gas phase it is named as a binary molecular compound: hydrogen + chloride.
What counts as a binary acid in this calculator?
A binary acid contains hydrogen and a single nonmetal only. Typical examples are halogen acids (HX) and chalcogen acids (H2X).
Why do some binary acids have the form HX and others H2X?
Halogens commonly form hydrogen halides with a 1:1 ratio (HX), while chalcogens commonly form hydrides with a 2:1 ratio (H2X). The formula ratio changes the subscripts but not the core acid naming pattern.