Acids

Writing names and Formulas

Acids

Compounds that give off hydrogen ions when dissolved in water. Labeled aqueous, will have (aq) after formula Ex. HCl (aq)

Must have H+ in them. will always be some H with an anion

(non-metal). The anion determines the name.

Naming Binary acids

If the anion attached to hydrogen is monatomic the anion ends in –ide to name it as an acid put the prefix hydro-

and change -ide to -ic acid Examples:

HCl - hydrogen ion and chloride ion hydrochloric acid

H2S hydrogen ion and sulfide ion hydrosulfuric acid

Naming Ternary Acids

If the anion has oxygen in it (a polyatomic) it ends in -ate or -ite

change the suffix -ate to -ic and add acid Example HNO3 Hydrogen and nitrate ions

Nitric acid

change the suffix -ite to -ous acid HNO2 Hydrogen and nitrite ions

Nitrous acid

Rule: ic ate ite ous

Name these

HF H3P

H2SO4

H2SO3

HCN H2CrO4

Writing Acid Formulas

Hydrogen will always be first (H+) The name will tell you the anion

Use subscripts to make the charges cancel out.

Binary Acids: start with hydro (hydrogen)- no oxygen, ic acid from the - ide anion

Ternary Acid: - start with hydrogen ic acid from – ate anion, ous acid from -ite anion

Write formulas for these

hydroiodic acid sulfuric acid carbonic acid phosphorous acid hydrobromic acid