This is done by using the the table of ions.
Take the charge of the ions and drop and swap the numbers.
copper hydroxide: = Cu2+ OH 1-
= Cu1 OH2
= Cu(OH)2
When do I use brackets??
Brackets are used when a number bigger than 1 is placed behind an ion that has two capital letters in its formula. eg OH-.
copper hydroxide = Cu(OH)2 not CuOH2
calcium nitrate = Ca(NO3)2 not CaNO32.
Aluminium sulfate = Al2(SO4)3
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