ionic compounds: naming
DESCRIPTION
Ionic Compounds: Naming. Naming Binary Ionic Compounds. Always name metal [(+) cation] first 2. Write stem of non-metal [(-) anion] 3. Add ending “ ide ” to non-metal. Stems of nonmetals. The First Step in Naming. Find metal on PT - PowerPoint PPT PresentationTRANSCRIPT
Ionic Compounds: Naming
Naming Binary Ionic Compounds
1. Always name metal [(+) cation] first
2. Write stemstem of non-metal [(-) anion]
3. Add ending “ide” to non-metal
Stems of nonmetalselement stem
nitrogen nitr
phosphorus phosph
arsenic arsen
selenium selen
oxygen ox
bromine brom
iodine iod
flourine fluor
chlorine chlor
The First Step in NamingThe First Step in Naming
• Find metal on PT
• If metal has only one oxidation state it’s easy
• If metal has more than one oxidation state, there’s an extra step
Metals with one oxidation state(name metal, stem non-metal, add “ide”)
• CaO• BaS• AlN• LiCl• Al2Se3
• Na2O• K3N• MgF2
calcium oxcalcium oxideide
barium sulfbarium sulfideide
aluminum nitraluminum nitrideide
lithium chlorlithium chlorideide
aluminum selenaluminum selenideide
sodium qxsodium qxideidepotassium nitrpotassium nitrideide
magnesium fluormagnesium fluorideide
Metals with more than 1 oxidation state
• figure out which oxidation # for metal ionfigure out which oxidation # for metal ion– Ex: Fe can be Fe+2 oror Fe+3
• FeO and Fe2O3 – two differenttwo different compounds
– cannot name both iron oxide – every formula has 1 name only
FeO and Fe2O3
• Compounds are electrically neutral
• Oxygen is -2
FeOFeO
Name: Name: iron (II) oxideiron (II) oxide(roman numeral II represents +2 charge on Fe)(roman numeral II represents +2 charge on Fe)
1 O which is -21 O which is -2
so Fe must be +2so Fe must be +2
FeO and Fe2O3
• Compounds are electrically neutral
• Oxygen is -2
FeFe22OO33
each O is -2each O is -2
3 O3 O’’s 3(-2) = -6s 3(-2) = -6total negative chargetotal negative charge
total positive charge total positive charge must be +6must be +6
each Fe is +3each Fe is +3iron (III) oxideiron (III) oxide
Name the following
• TiCl3• Mn2O4
• Co2O3
• PdBr2
• AuCl3• MoN• MnO• TiO
titanium (III) chloridetitanium (III) chloride
manganese (IV) oxidemanganese (IV) oxide
cobalt (III) oxidecobalt (III) oxide
palladium (II) bromidepalladium (II) bromide
gold (III) chloridegold (III) chloride
molybdenum (III) nitridemolybdenum (III) nitride
manganese (II) oxidemanganese (II) oxide
titanium (II) oxidetitanium (II) oxide
POLYATOMIC IONSPOLYATOMIC IONS
• Table E: groups of covalently bonded atoms that have a charge (+) or (–)
• polyatomic ions have “names”
• (-) polyatomic ions can form ionic bonds with (+) metal ions
SOSO442-2- CO CO33
2-2- PO PO443-3- OH OH1-1-
Ternary Compounds
• contain 3 or more elements • usually contain a polyatomic ion
– if polyatomic is (+) it’s bonded to a non-metal– if polyatomic is (–) it’s bonded to a metal– sometimes 2 polyatomics are bonded
together
Formulas with polyatomicsFormulas with polyatomics
• What’s the formula for the compound formed from Al+3 and SCN-1?
• The charges must add up to zero, so write the symbols, positive first!
Al(SCN)Al(SCN)33
Try a few more:
• Na+1 and OH-1
• K +1 and HCO3-1
• Mg+2 and CO3-2
• Li +1 and NO3-1
• Ca+2 and SO4-2
NaOHNaOH
KHCOKHCO33
MgCOMgCO33
LiNOLiNO33
CaSOCaSO44
These are more challenging:
• Mg+2 and (PO4)-3
• Al+3 and (NO3)-1
• Fe+2 and OH-1
• Hg2+2 and SCN-1
• Mg+2 and HCO3-
• Al+3 and C2O42-
MgMg33(PO(PO44))22
Al(NOAl(NO33))33
Fe(OH)Fe(OH)22
HgHg22(SCN)(SCN)22
Mg(HCOMg(HCO33))22
AlAl22(C(C22OO44))33
More challenging
• zinc + nitrate ion• magnesium + hydroxide ion• lithium + carbonate ion• potassium + sulfate ion• calcium + phosphate ion• beryllium + chlorate ion
Zn(NOZn(NO33))22
Mg(OH)Mg(OH)22
LiLi22COCO33
KK22SOSO44
CaCa33(PO(PO44))22
Be (ClOBe (ClO33))22
Naming compounds with polyatomics
• polyatomic ions have names (Table E)
• Naming similar to binary naming
• Rules:– positive always written first– if (+)’ve ion is a metal, check to see how many
oxidation states it has • if more than 1, need roman numeral
– if (–)’ve ion is polyatomic - 2nd part of name is name of polyatomic (don’t modify ending)
Name the following
• NaOHNaOH• KHCOKHCO33
• LiNOLiNO33
• CaSOCaSO44
• Al(NOAl(NO33))33
• Fe(OH)Fe(OH)22
• CuSOCuSO44
• CuSCNCuSCN
sodium hydroxidesodium hydroxide
potassium hydrogen carbonatepotassium hydrogen carbonate
lithium nitratelithium nitrate
calcium sulfatecalcium sulfate
aluminum nitratealuminum nitrate
iron (II) hydroxideiron (II) hydroxide
copper (II) sulfatecopper (II) sulfate
copper (I) thiocyanatecopper (I) thiocyanate
Summary for Binary Ionic Summary for Binary Ionic CompoundsCompounds
• Compounds are electrically neutral
• Formula: positive ion goes first
• If metal has more than 1 oxidation state, name has roman numeral
• Name = metal + stem of nonmetal + ide