WRITING NAMES &
FORMULAS FOR ACIDS,
BASES, & GASES
Textbook Pages: 68 - 69
Acids
• Acids are ionic compounds where hydrogen is the
positive ion.
• They ionize (come apart) in water (aqueous – aq) and
release a hydrogen ion (H+).
• They can bond with non-metals to make binary acids.
• They can bond with polyatomics to make oxy acids
(MORE ON THIS LATER).
Naming Binary Acids
• Binary acids involve bonding hydrogen ionically with a
non-metal.
• They are named using a pattern.
Hydro
ic acid
(name of non-metal)
• Examples:
• HCl (aq) – Hydrochloric acid
• H2S (aq) –
• HCl (g) –
Writing Formulas for Binary Acids
• Criss-cross the valences because acids are ionic.
• Hydrogen always has a charge of 1+.
• Refer to the Periodic Table for the negative ion charge.
• Examples:
• Hydroiodic acid
• Hydrofluoric acid
H1+ I1-
HI (aq)
Bases
• Bases are ionic compounds where hydroxide is the
negative ion.
• They ionize (come apart) in water (aqueous – aq) and
release a hydroxide ion (OH−).
• They bond with metals.
• They can bond with positively charged polyatomic ions
(MORE ON THIS LATER).
Naming Bases
• Bases involve bonding metal ion ionically with a
hydroxide ion.
• They are named using a pattern.
Metal Name
+
• Examples:
• Ca(OH)2 (aq) – Calcium Hydroxide
• NaOH (aq) –
• Fe(OH)2 (aq) –
Hydroxide
Writing Formulas for Bases
• Criss-cross the valences because bases are ionic.
• Hydroxide always has a charge of 1-.
• Refer to the Periodic Table for the positive ion charge.
• Examples:
• Lithium Hydroxide Li1+ OH1−
• Copper (II) Hydroxide
LiOH (aq)
Naming & Writing Formulas for Gases
• There are two types of gases:
• 1. Monoatomic (one atom) – Noble Gases
• Examples:
• He (g) – Helium gas
• Argon gas – Ar (g)
• 2. Diatomic (two atoms) – MEMORIZE!!!
•
•
•
•
•
•
•
I2 (g) – iodine gas
Br2 (g) – bromine gas
Cl2 (g) – chlorine gas
F2 (g) – fluorine gas
O2 (g) – oxygen gas
N2 (g) – nitrogen gas
H2 (g) – hydrogen gas
I Bring Clay For Our New House
OR
H Br O N Cl I F
Let’s Play Some Jeopardy!!!