Chapter 9Chapter 9

Naming ACIDSNaming ACIDS

Sodium chloride

Hydrogen

peroxide

Magnesium sulphate

Nitrogen dioxide

Hydrochloric acid

Calciu

m fl

uorid

e

Carbon monoxide

Naming AcidsNaming Acids

An An ACIDACID is a substance that when put into is a substance that when put into water, gives away a hydrogen ion (Hwater, gives away a hydrogen ion (H+1+1) to ) to another substance in the water solution.another substance in the water solution.

HCl + HHCl + H22O O HClHCl(aq)(aq)

There are two types of acids:There are two types of acids:1. Binary acids-HCl1. Binary acids-HCl(aq)(aq)

2. Ternary acids-H2. Ternary acids-H22SOSO44(aq)(aq)

-polyatomic ions (ending in -polyatomic ions (ending in ateate))

-polyatomic ions (ending in -polyatomic ions (ending in iteite))

Naming Binary AcidsNaming Binary Acids

EX: HClEX: HCl(aq)(aq)

1. Use the prefix 1. Use the prefix hydrohydro for hydrogenfor hydrogen

2. Anion ending changes from ide to 2. Anion ending changes from ide to icic

3. Add the word acid at the end.3. Add the word acid at the end.

hydrochloric acidhydrochloric acid

Naming Ternary AcidsNaming Ternary AcidsPolyatomic ions ending in Polyatomic ions ending in ateate

EX: HEX: H22SOSO44

1. NO hydro prefix!!!1. NO hydro prefix!!!2. Anion ending changes from 2. Anion ending changes from ATE ATE toto

ICIC --SulfSulfateate change to Sulfur change to Sulfuricic “ “ICIC II ATEATE thatthat””

3. Add the word acid at the end3. Add the word acid at the end

Sulfuric acidSulfuric acid

Naming Ternary AcidsNaming Ternary AcidsPolyatomic ions ending in Polyatomic ions ending in iteite

EX: HEX: H22SOSO33

1. NO hydro prefix!!!1. NO hydro prefix!!!

2. Anion ending changes from 2. Anion ending changes from ITE ITE toto OUSOUS

-Sulf-Sulfiteite change to Sulfur change to Sulfurousous

““RRITEOUSITEOUS””

3. Add the word acid at the end3. Add the word acid at the end

Sulfurous acidSulfurous acid

Practice Naming AcidsPractice Naming Acids

1.1. HH33POPO44

--POPO4 4 = phosphate= phosphate

-Use saying -Use saying ““ICIC II ATEATE thatthat””

Answer= Answer= Phosphoric acidPhosphoric acid

2. HNO2. HNO22

-NO-NO2 2 = nitrite= nitrite

-Use saying -Use saying ““RRITEOUSITEOUS””

Answer= Answer= Nitrous acidNitrous acid

Writing AcidsWriting Acids

How to Write a Formula for an How to Write a Formula for an Acid:Acid:

BINARY ACIDSBINARY ACIDS

Ex: hydrosulfuric acidEx: hydrosulfuric acid

1. Write down symbols (H and S)1. Write down symbols (H and S)

2. Determine Charges (H2. Determine Charges (H+1 +1 SS-2-2))

3. Cancel charges or use criss-cross 3. Cancel charges or use criss-cross method method

to form subscripts to cancel out to form subscripts to cancel out chargescharges

4. H4. H22SS

Ternary ACIDSTernary ACIDSEx: sulfuric acidEx: sulfuric acid1. No hydro prefix so we have a polyatomic 1. No hydro prefix so we have a polyatomic

ion:ion: In this case “In this case “ICIC II ATEATE thatthat””

sulfuric = sulfate (SOsulfuric = sulfate (SO44))-2-2

Can also be Can also be ““RRITEOUSITEOUS”” sulfurous = sulfite sulfurous = sulfite

2. Write down symbols (H and SO2. Write down symbols (H and SO44))

3. Determine Charges (H3. Determine Charges (H+1 +1 SOSO44 -2-2))

4. Cancel charges or use criss-cross method 4. Cancel charges or use criss-cross method to form subscripts to cancel out chargesto form subscripts to cancel out charges

5. H5. H22SOSO44