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Naming Multivalent Compounds

Naming Multivalent Compounds. What are multivalent ions?. Some transition metals can form more than one ion In other words some have more than 1 ion form. For Example: Copper has 2 ion forms Can be a 1+ or 2+ ion. Copper I Chloride. Copper II Chloride. Writing Multivalent Compounds.

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Naming Multivalent Compounds

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  1. Naming Multivalent Compounds

  2. What are multivalent ions? • Some transition metals can form more than one ion • In other words some have more than 1 ion form For Example: Copper has 2 ion forms Can be a 1+ or 2+ ion Copper I Chloride Copper II Chloride

  3. Writing Multivalent Compounds Use roman numeral to show which ion form is present Metal Ion charge Roman Numeral 1+ I 2+ II 3+ III 4+ IV 5+ V 6+ VI 7+ VII Ni2+ or Nickel II, is called Nickel two Fe3+ or Ion III, is called Iron three

  4. Steps for writing formulas for multivalent compounds • 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

  5. Example: Copper II Chloride Cu2+ and Cl- ions Total charge to balance +2 = -1-1 ratio 1 : 2 formula CuCl2

  6. Example: Manganese IV Oxide Mn4+ and O-2 ions Total charge to balance +4 = -2-2 ratio 1 : 2 formula MnO2

  7. Steps for naming compounds that contain a multivalent metal • Step 1: Identify the multivalent metal (first ion written in formula • Step 2: verify that it has more than one ion form • Step 3: determine the ratio of ions in the formula • Step 4: what is the charge on the negative ion? • Step 5: what must be the charge on the positive metal ion if it is to balance the negative ion • Step 6: write the name of the compound

  8. Example: Au3N Au ID the metal Au+ and Au3+ Can it be in more than 1 ion form? Au3N 3 Au ions for every 1 N ion Determine the ratio of ions in the formula Charge on the negative ion N3- If there are 3 Au ions then the charge on Au must be 1+ to balance out N3- What does the charge on the metal have to be to balance the negative ion? The Name is: Gold(I)Nitride

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