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Nomenclature II. Naming complex compounds. Oxidation Number. A method of naming compounds by determining apparent charge The apparent charge on the nonmetal never changes; add up the total negative charges- the number of total positive charges must balance the formula. Examples.
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Nomenclature II Naming complex compounds
Oxidation Number • A method of naming compounds by determining apparent charge • The apparent charge on the nonmetal never changes; add up the total negative charges- the number of total positive charges must balance the formula.
Examples • MnBr4 What is the name of this compound? • What is the charge on bromide? • 1 How many total negative charges? • 4 • If only one Mn is present, what is the apparent charge • 4 Name of the compound? • Manganese (IV) bromide. Traditional name? • Manganic bromide
Example II • P2S5 What is the name of this compound? • What is the charge on sulfide? –2 Total negative charges? • -10 • There are 2 phosphorus present. What is the apparent charge on each one to neutralize the compound? • +5 • Name of the compound? Use Stock name. • Phosphorus (V) sulfide Traditional name? • Phosphorous sulfide Note the change in spelling • Prefix name? • Diphosphorus pentasulfide
Oxygenated Polyatomic ions • Many polyatomic ions are related • The only difference is the number of oxygen atoms present in the polyatomic unit • So2-2 hyposulfite Latin prefix meaning below • SO3-2 sulfite • SO4-2 sulfate • SO5-2 persulfate