Naming Compounds Naming Compounds Having Polyatomic IonsHaving Polyatomic Ions

Objective: Objective: To learn the names of To learn the names of common polyatomic ions and how common polyatomic ions and how

to use them in naming to use them in naming compounds.compounds.

Define polyatomic ion Define polyatomic ion

• A group of atoms with a chargeA group of atoms with a charge

• Some ExamplesSome Examples

• SOSO442-2- CNCN-- C C22HH33OO22

--

• sulfatesulfate cyanidecyanide acetate acetate

• OHOH-- NONO33-- NO NO22

--

• Hydroxide nitrateHydroxide nitrate nitritenitrite

Polyatomic vs. Monatomic Polyatomic vs. Monatomic

• How are the ions SHow are the ions S2-2- and SO and SO442-2- different? different?

• SOSO442-2- is five atoms combined to make is five atoms combined to make

one ion.one ion.

• SOSO443-3- is a polyatomic ion is a polyatomic ion

Turn to page 100Turn to page 100

• Note the table listing the most Note the table listing the most common polyatomic ions. common polyatomic ions.

• This table will be supplied to you This table will be supplied to you when you take the test.when you take the test.

• Let’s look at it.Let’s look at it.

What do you notice about the What do you notice about the names of most polyatomic names of most polyatomic ions? ions? • Most end with either –ite or –ate.Most end with either –ite or –ate.

• Notice there are some that end in -ide. Notice there are some that end in -ide.

• Perchlorate ClOPerchlorate ClO44--

• chlorate ClOchlorate ClO33--

• chlorite ClOchlorite ClO22--

• hypochlorite ClOhypochlorite ClO--

• ChlorideChloride ClCl--

Naming Compounds that Naming Compounds that Contain Polyatomic IonsContain Polyatomic Ions

• Say the name of the positive ionSay the name of the positive ion

• Say the name of the negative ionSay the name of the negative ion

• NaNa22SOSO33 K K22SOSO44

• sodium sulfite sodium sulfite potassium potassium sulfatesulfate

• KCKC22HH33OO2 2

• Potassium acetatePotassium acetate

This will be easier if you This will be easier if you remember this:remember this:

• Compounds only have two namesCompounds only have two names

• CuCOCuCO3 3

• Copper(II) carbonateCopper(II) carbonate

Compounds Containing SOCompounds Containing SO442-2-

• The name of the polyatomic ion is sulfateThe name of the polyatomic ion is sulfate

• BaSOBaSO44 AlAl22(SO(SO44))33

• barium sulfate barium sulfate aluminum sulfatealuminum sulfate

• CaSOCaSO44 NaNa22SOSO44

• calcium sulfatecalcium sulfate sodium sulfatesodium sulfate

Compounds Containing OHCompounds Containing OH--

• The name of the polyatomic ion is The name of the polyatomic ion is hydroxidehydroxide

• NaOHNaOH Cu(OH)Cu(OH)22

• sodium hydroxidesodium hydroxide copper(II) copper(II) hydroxidehydroxide

• Al(OH)Al(OH)33 Fe(OH)Fe(OH)22

• aluminum hydroxidealuminum hydroxide Iron(II) hydroxideIron(II) hydroxide

Compounds Containing Compounds Containing CC22HH33OO22

--

• Ba(CBa(C22HH33OO22))22 Cu(CCu(C22HH33OO22))22

• Barium acetate Barium acetate copper(II) copper(II) acetateacetate

• MgMg (C(C22HH33OO22))22 HgHg22(C(C22HH33OO22))22

• Magnesium acetateMagnesium acetate mercury(I) mercury(I) acetateacetate

Compounds Containing HCompounds Containing H22POPO44--

The name of the polyatomic The name of the polyatomic ion is dihydrogen phosphate.ion is dihydrogen phosphate.• NaHNaH22POPO4 4

• Remember: Say the name of the Remember: Say the name of the positive ion and then the name of the positive ion and then the name of the negative ion.negative ion.

• Sodium dihydrogen phosphateSodium dihydrogen phosphate

Writing Formulas of Writing Formulas of Compounds that Contain Compounds that Contain Polyatomic Ions Polyatomic Ions • Sodium phosphate Sodium phosphate

Write the Formula for Write the Formula for Barium NitrateBarium Nitrate

• Barium Barium NitrateNitrate

Write the Formula for Write the Formula for Calcium HydroxideCalcium Hydroxide

• CalciumCalcium HydroxideHydroxide

Write the Formula for Write the Formula for Calcium chlorideCalcium chloride

• Only put parentheses around Only put parentheses around polyatomic ionspolyatomic ions

Write the formula for Write the formula for ammonium carbonateammonium carbonate

• ammonium carbonateammonium carbonate