Chapter 5.8 & Naming & Formula Writing for Ionic Compounds

Naming Binary Ionic Compounds Binary Ionic Compounds: contain 2 different elements: metal + non-metal Binary Ionic Compounds: contain 2 different elements: metal + non-metal Name the metal first, then the nonmetal as -ide. Name the metal first, then the nonmetal as -ide.Examples: NaClsodium chloride ZnI 2 zinc iodide Al 2 O 3 aluminum oxide

Naming Binary Ionic Compounds Binary Ionic Compounds: contain 2 different elements: metal + non-metal Binary Ionic Compounds: contain 2 different elements: metal + non-metal Name the metal first, then the nonmetal as -ide. Name the metal first, then the nonmetal as -ide.Examples: NaClsodium chloride ZnI 2 zinc iodide Al 2 O 3 aluminum oxide

Learning Check Name the following binary compounds: 1. Na 3 N________________ 2. KBr________________ 3. Al 2 O 3 ________________ 4. MgS________________

Solution Complete the names of the following binary compounds: Na 3 Nsodium nitride KBrpotassium bromide Al 2 O 3 aluminum oxide MgSmagnesium sulfide

Naming Ionic Compounds Containing Multi-Valent Ions Use a roman numeral after the name of a metal that is multi-valent (i.e. that has more than one possible charge) Use a roman numeral after the name of a metal that is multi-valent (i.e. that has more than one possible charge) Examples: Examples: FeCl 3 (Fe 3+ ) iron (III) chloride CuCl (Cu + ) copper (I) chloride SnF 4 (Sn 4+ ) tin (IV) fluoride PbCl 2 (Pb 2+ )lead (II) chloride Fe 2 S 3 (Fe 3+ )iron (III) sulfide Fe 2 S 3 (Fe 3+ )iron (III) sulfide

Learning Check Complete the names of the following binary compounds with multi-valent metal ions: FeBr 2 iron (_____) bromide Cu 2 Ocopper (_____) oxide SnCl 4 ______(_____ )________ Fe 2 O 3 _______(_____)________ Fe 2 O 3 _______(_____)________ CuS_______(_____)________

Solution Complete the names of the following binary compounds with variable metal ions: FeBr 2 iron (II) bromide Cu 2 Ocopper (I) oxide SnCl 4 tin (IV) chloride Fe 2 O 3 iron (III) oxide Fe 2 O 3 iron (III) oxide CuScopper (II) sulfide

Learning Check Name the following compounds: A. CaO 1) calcium oxide 2) calcium(I) oxide 3) calcium (II) oxide B. SnCl 4 1) tin tetrachloride 2) tin(II) chloride 3) tin(IV) chloride C. Co 2 O 3 1) cobalt oxide 2) cobalt (III) oxide 3) cobalt trioxide

Solution Name the following compounds: A. CaO1) calcium oxide B. SnCl 4 3) tin(IV) chloride C.Co 2 O 3 2) cobalt (III) oxide

Naming Ternary Ionic Compounds Contain at least 3 elements Contain at least 3 elements Name the nonmetals as a polyatomic ion Name the nonmetals as a polyatomic ion Examples: Examples: NaNO 3 Sodium nitrate K 2 SO 4 Potassium sulfate Al(HCO 3 ) 3 Aluminum bicarbonate orAluminum hydrogen carbonate orAluminum hydrogen carbonate

Learning Check Match each set with the correct name: A. Na 2 CO 3 1) magnesium sulfite MgSO 3 2) magnesium sulfate MgSO 4 3) sodium carbonate B.Ca(HCO 3 ) 2 1) calcium carbonate CaCO 3 2) calcium phosphate CaCO 3 2) calcium phosphate Ca 3 (PO 4 ) 2 3) calcium bicarbonate Ca 3 (PO 4 ) 2 3) calcium bicarbonate

Solution A. Na 2 CO 3 3) sodium carbonate MgSO 3 1) magnesium sulfite MgSO 4 2) magnesium sulfate B.Ca(HCO 3 ) 2 3) calcium bicarbonate CaCO 3 1) calcium carbonate CaCO 3 1) calcium carbonate Ca 3 (PO 4 ) 2 2) calcium phosphate Ca 3 (PO 4 ) 2 2) calcium phosphate

Learning Check A. aluminum nitrate 1) AlNO 3 2) Al(NO) 3 3) Al(NO 3 ) 3 1) AlNO 3 2) Al(NO) 3 3) Al(NO 3 ) 3 B. copper(II) nitrate 1) CuNO 3 2) Cu(NO 3 ) 2 3) Cu 2 (NO 3 ) 1) CuNO 3 2) Cu(NO 3 ) 2 3) Cu 2 (NO 3 ) C. Iron (III) hydroxide 1) FeOH2) Fe 3 OH3) Fe(OH) 3 1) FeOH2) Fe 3 OH3) Fe(OH) 3 D. Tin(IV) hydroxide 1) Sn(OH) 4 2) Sn(OH) 2 3) Sn 4 (OH) 1) Sn(OH) 4 2) Sn(OH) 2 3) Sn 4 (OH)

Solution A. aluminum nitrate 3) Al(NO 3 ) 3 3) Al(NO 3 ) 3 B. copper(II) nitrate 2) Cu(NO 3 ) 2 2) Cu(NO 3 ) 2 C. Iron (III) hydroxide 3) Fe(OH) 3 3) Fe(OH) 3 D. Tin(IV) hydroxide 1) Sn(OH) 4 1) Sn(OH) 4

Formula Writing For Ionic Compounds (using magnesium chloride as an example) Step 1: Write the symbol with the ionic charge for the metal ion followed by the non-metal ion. Step 1: Write the symbol with the ionic charge for the metal ion followed by the non-metal ion. Mg 2+ Cl 1- Mg 2+ Cl 1- Step 2: Use the “criss-cross” rule to place subscripts beside opposing ions – this will ensure an overall charge of zero in the ionic formula. Step 2: Use the “criss-cross” rule to place subscripts beside opposing ions – this will ensure an overall charge of zero in the ionic formula. Mg 1 Cl 2 Mg 1 Cl 2 Step 3: Simplfy (if possible) Step 3: Simplfy (if possible) Mg Cl 2 (subscripts of 1 are not shown) Mg Cl 2 (subscripts of 1 are not shown)

Formula Writing For Ionic Compounds E.g. 2 Write the chemical formula for aluminum nitrate. E.g. 2 Write the chemical formula for aluminum nitrate. Step 1: Al 3+ NO 3 1- Step 1: Al 3+ NO 3 1- Step 2: Al 1 Cl 3 Step 2: Al 1 Cl 3 Step 3: Al Cl 3 Step 3: Al Cl 3 E.g. 3 Write the chemical formula for calcium oxide. E.g. 3 Write the chemical formula for calcium oxide. Step 1: Ca 2+ O 2- Step 1: Ca 2+ O 2- Step 2: Ca 2 O 2 * both subscripts divisible by two Step 2: Ca 2 O 2 * both subscripts divisible by two Step 3: Ca O Step 3: Ca O

Formula Writing For Ionic Compounds E.g. 4 Write the chemical formula for iron (III) oxide. E.g. 4 Write the chemical formula for iron (III) oxide. Step 1: Fe 3+ O 2- Step 1: Fe 3+ O 2- Step 2: Fe 2 O 3 Step 2: Fe 2 O 3 Step 3: Fe 2 O 3 Step 3: Fe 2 O 3 E.g. 5 Write the chemical formula for calcium sulfate E.g. 5 Write the chemical formula for calcium sulfate Step 1: Ca 2+ SO 4 2- Step 1: Ca 2+ SO 4 2- Step 2: Ca 2 (SO 4 ) 2 Step 2: Ca 2 (SO 4 ) 2 Step 3: CaSO 4 Step 3: CaSO 4

Formula Writing For Ionic Compounds E.g. 6 Write the chemical formula for barium phosphate. E.g. 6 Write the chemical formula for barium phosphate. Step 1: Ba 2+ PO 4 3- Step 1: Ba 2+ PO 4 3- Step 2: Ba 3 (PO 4 ) 2 Step 2: Ba 3 (PO 4 ) 2 Step 3: Ba 3 (PO 4 ) 2 Step 3: Ba 3 (PO 4 ) 2 E.g. 7 Write the chemical formula for aluminum tripolyphosphate. E.g. 7 Write the chemical formula for aluminum tripolyphosphate. Step 1: Al 3+ P 3 O Step 1: Al 3+ P 3 O Step 2: Al 5 (P 3 O 10 ) 3 Step 2: Al 5 (P 3 O 10 ) 3 Step 3: Al 5 (P 3 O 10 ) 3 Step 3: Al 5 (P 3 O 10 ) 3

Homework: Q.1-9 p.195. Q.1-9 p.195. Q.1-7 p.198. Q.1-7 p.198.