Ionic Compounds with Ionic Compounds with Polyatomic IonsPolyatomic Ions

Polyatomic IonsPolyatomic Ions

A group of atoms with an overall charge.A group of atoms with an overall charge.

NHNH44++ ammoniumammonium OHOH-- hydroxide hydroxide

NONO33-- nitrnitrateate NONO22

-- nitr nitriteite

COCO332-2- CarbonateCarbonate

HCOHCO33-- hydrogen carbonate (bicarbonate)hydrogen carbonate (bicarbonate)

More Polyatomic IonsMore Polyatomic Ionsite means one less oxygen is present, charge remains the ite means one less oxygen is present, charge remains the

samesame

SOSO442-2- sulfsulfateate

SOSO332-2- sulfsulfiteite

Hydrogen or Bi means you add a Hydrogen and reduce the Hydrogen or Bi means you add a Hydrogen and reduce the

charge by onecharge by one

HHSOSO44-- hydrogenhydrogen sulf sulfateate

HHSOSO33-- hydrogenhydrogen sulf sulfiteite

PhosphPhosphateate POPO443-3-

phosphphosphiteite POPO333- 3-

HPOHPO442-2- HydrogenHydrogen Phosphate Phosphate

HH22POPO44-- dihydrogendihydrogen phosphate phosphate

Naming Ionic Compounds with Naming Ionic Compounds with Polyatomic Ions or Ternary Polyatomic Ions or Ternary CompoundsCompounds

Contain at least 3 elementsContain at least 3 elementsName the nonmetals as a Name the nonmetals as a polyatomic ionpolyatomic ionExamples:Examples:

NaNaNONO33 Sodium Sodium nitratenitrate

KK22SOSO44 Potassium Potassium sulfatesulfate

AlAl(HCO(HCO33))33 AluminumAluminum bicarbonatebicarbonate

or or

AluminumAluminum hydrogen carbonatehydrogen carbonate

Learning Check Learning Check

Match each set with the correct name:Match each set with the correct name:

A.A. NaNa22COCO33 1) magnesium sulfite 1) magnesium sulfite

MgSOMgSO33 2) magnesium sulfate2) magnesium sulfate

MgSOMgSO44 3) sodium carbonate 3) sodium carbonate

B.B. Ca(HCOCa(HCO33))22 1) calcium carbonate1) calcium carbonate

CaCOCaCO33 2) calcium phosphate2) calcium phosphate

CaCa33(PO(PO44))2 2 3) calcium 3) calcium bicarbonatebicarbonate

Solution Solution

A.A. NaNa22COCO33 3) sodium carbonate 3) sodium carbonate

MgSOMgSO33 1) magnesium sulfite 1) magnesium sulfite

MgSOMgSO44 2) magnesium sulfate2) magnesium sulfate

B.B. Ca(HCOCa(HCO33))22 3) calcium bicarbonate3) calcium bicarbonate

CaCOCaCO33 1) calcium carbonate1) calcium carbonate

CaCa33(PO(PO44))2 2 2) calcium phosphate2) calcium phosphate

Learning Check Learning Check

A. aluminum nitrate A. aluminum nitrate

1) AlNO1) AlNO3 3 2) Al(NO)2) Al(NO)33 3) Al(NO3) Al(NO33))33

B. copper(II) nitrateB. copper(II) nitrate

1) CuNO1) CuNO33 2) Cu(NO2) Cu(NO33))22 3) Cu3) Cu22(NO(NO33))

C. Iron (III) hydroxideC. Iron (III) hydroxide

1) FeOH1) FeOH 2) Fe2) Fe33OHOH 3) 3)

Fe(OH)Fe(OH)33

D. Tin(IV) hydroxideD. Tin(IV) hydroxide

1) Sn(OH)1) Sn(OH)44 2) Sn(OH) 2) Sn(OH)22 3) Sn 3) Sn44(OH)(OH)

Solution Solution

A. aluminum nitrate A. aluminum nitrate

3) Al(NO3) Al(NO33))33

B. copper(II) nitrateB. copper(II) nitrate

2) Cu(NO2) Cu(NO33))22

C. Iron (III) hydroxideC. Iron (III) hydroxide

3) Fe(OH)3) Fe(OH)33

D. Tin(IV) hydroxideD. Tin(IV) hydroxide

1) Sn(OH)1) Sn(OH)44

NoticeNotice

• When formulas are formed, the When formulas are formed, the number of Oxygens are NOT changed.number of Oxygens are NOT changed.

• Sulfate has 4 Oxygens and is written Sulfate has 4 Oxygens and is written SOSO44 if there is one, two or five present. if there is one, two or five present.

• Number of SONumber of SO44 ‘s present is shown by ‘s present is shown by placing the Polyatomic in parenthesis placing the Polyatomic in parenthesis and the amount is placed outsideand the amount is placed outside

• 2 Sulfates would be written as (SO2 Sulfates would be written as (SO44))22