Homework Help Forum: chemistry

Posted by mike on Sunday, October 25, 2009 at 6:56pm.

how do you know what/which roman numeral to place between the cation and the anion of metal-nonmetal substances?

• chemistry - tammy, Sunday, October 25, 2009 at 6:59pm

  if the sountance is hard that is roman numeral.

  
  

• chemistry - DrBob222, Sunday, October 25, 2009 at 8:24pm

  Tammy is incorrect with that answer. The correct answer is that the Roman numeral is the oxidation state of the cation. For example, in CuSO4 it is copper(II) sulfate. The old name was cupric sulfate. Another example. Cu2O is copper(I) oxide. CuO is copper(II) oxide. FeSO4 is iron(II) sulfate. Fe2(SO4)3 is iron(III) sulfate.

  
  

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