Naming Compounds: How to Write (NH4)+ Al3+ SO4 2-

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SUMMARY

The correct naming of the compound Ammonium Aluminium Sulfate is represented as (NH4)3Al(SO4)2. This formula indicates that three ammonium ions (NH4)+ combine with one aluminium ion (Al3+) and two sulfate ions (SO4)2-. While there are no strict rules for determining hydration waters in mixed salts, the general guideline is to use the formula NH4Me(SO4)2 for salts containing ammonium and trivalent metals. Experimental determination is often necessary to ascertain the amount of water in the crystal structure.

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How do you name compounds such as Ammonium Aluminium Sulfate?

It should first be (NH4)+ then Al 3+ and SO4 2-, but how do you put then together? How do you know it is [latex]NH_4 AL (SO_4)_2[/latex] instead of, say, [latex] (NH_4)_3 Al (SO_4)_3 [/latex]?

Thanks!
 
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I am afraid it is one of the things you have to remember. That is, you don't have to remember every possible salt separately, most mixed salts containing ammonium and Me3+ have NH4Me(SO4)2 formula. But when it comes to hydration waters there are no rules (or more precisely, the rule is "whatever crystal form has the lowest energy" - but calculating crystal energy is so difficult, it is easier to prepare the salt and determine amount of water experimentally).
 

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