Acid Names & Formulas

Binary acids

based on ion ending with -ide

Oxyacids

based on polyatomic ions ending in -ate or -ite

Binary Acids Rule:

if the anion ends in -ide, the acid name is hydro + stem + ic acid

hydrofluoric acid

HF

Hydrochloric acid

HCl

Hydrobromic acid

HBr

hydroiodic acid

HI h

hydrosulfuric acid

H₂S

hydroselenic acid

H₂Se

What is the polyatomic ion that ends in -ide that follows the binary acid naming rule?

HCN - Hydrocyanic acid (or cyanide)

Oxyacids contains a polyatomic ion with….

oxygen

The polyatomic ion will usually end in

-ate → -ic acid
-ite → -ous acid

Acetic Acid

CH₃CO₂H or HC₂H₃O₂

Nitric acid

HNO₃

Oxalic acid

H₂C₂O₄

Sulfuric acid

H₂SO₄

Phosphoric acid

H₃PO₄

Nitrous acid

HNO₂

phosphoric acid

H₃PO₄

sulfurous acid

H₂SO₃