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Ionic Nomenclature

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  1. Ionic Nomenclature Multi-valent metals

  2. Some transition metals are multivalent • This means they have more than one ion form • Look at the periodic table and locate some multivalent transition metals What does multivalent mean?

  3. What are multivalent ions? For Example: Copper has 2 ion forms Can be a 1+ or 2+ ion Copper I Chloride Copper II Chloride

  4. We need to distinguish between the two or three different ion forms • Use roman numerals from I – VII which corresponds to 1+ - 7+ ion charges Metal Ion charge Roman Numeral 1+ I 2+ II 3+ III 4+ IV 5+ V 6+ VI 7+ VII Writing names for multivalent ions

  5. For example: • Nickel can have two ion forms, Ni2+ and Ni3+ • These are named nickel (II) and Nickel (III) • There will only be 1 multivalent metal in a compound • It is the metal so it is first in the name (same as ionic compounds) • The roman numeral will indicate which ion form is in the compound Writing formulas for compounds containing a multivalent metal

  6. Step 1: Identify each ion and its charge • Step 2: Determine the total charges needed to balance positive and negative • Step 3: Note the ratio of positive ions to negative ions • Step 4: Use subscripts to write the formula, 1’s are not shown in subscript Steps for writing formulas for multivalent compounds

  7. Ti4+ and F1- ions Total charge to balance +4 = -1-1-1-1 ratio 1 : 4 Try the formula for titanium (IV) fluoride formula TiF4 189-191

  8. Manganese (III) Sulfide The 3 on the Mn ion becomes the # of S ions Mn3+ and S2- ions Total charge to balance +3+3 = -2-2-2 ratio 2 : 3 Criss-cross rule: A useful trick formula Mn2S3

  9. Key Points: • The metal is always first • The metal is always the positive ion • The metal could be a multivalent metal • Go to the periodic table and check Writing formulas for compounds that contain a multivalent metal

  10. Iron (II) oxide • Iron (III) oxide • Copper (II) nitride • Lead (IV) sulfide • FeO • Fe2O3 • Cu3N2 • PbS2 Now try these:

  11. Step 1: Identify a multivalentmetal • Step 2: identify its different ion forms • Step 3: determine the ratio of ions in the formula • Step 4: what is the charge on the negative ion? • Step 5: Balance the positive and negative charges • Step 6: Write the name using roman numerals in brackets, following the positive ion to indicate which ion was used Steps for Writing formulas for compounds that contain a multivalent metal

  12. Is there a multivalent metal? • Yes, Fe, Iron • What are its different ion forms? • 3+ and 2+ • What is the ratio of ions • 1 Fe : 2 I • What is the charge on the negative ion • I, Iodine, ion charge is 1- • but there are 2 so the total negative charge is 2- • Balance the positive and negative charges • Iron must have a 2+ charge to balance the two 1- charges from Iodine • Write the name using a roman numeral to say which ion form of Iron is present • The negative ion must drop its ending and add –ide (same as ionic compounds) • Iron (II) Iodide Example: FeI2

  13. Pb • 2+ and 4+ • Pb 1: 4 F • F’s ion charge 1- • Balance the charges • 4+ charges to balance the 4 1- charges of F • Therefore Pb must be the 4+ ion • Lead (IV) Fluoride Try another example: PbF4

  14. Try it with copper: CuCl2 CuSO4 Cu2O CuO • Copper (II) chloride • Copper (II) sulphate • Copper (I) oxide • Copper (II) oxide Names with Multivalent Ions