What is the difference between NH3 and NH4?

Question

callisto · Answer

NH4 is an positive ion while NH3 is a molecule with no net charge...

anonymous · Answer

NH3 is ammonia and NH4 is ammonium. And NH3 is a base? NH4 is an acid? am i right?

anonymous · Answer

NH3 is ammonia and NH4 is ammonium, but I am not sure of the nature of these substances.

callisto · Answer

NH3 is ammonia and NH4 is ammonium. <- yes
NH3 is a base? <- yes
NH4 is an acid? <- no

callisto · Answer

NH4 is only an ion
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For an acid, there must be an ionizable H^+ ion in one acid molecule, but there're no such ions, so it's not an acid

anonymous · Answer

When you draw the structure of NH4- frm that structure hw do u know whether a substance have any ionisable H^+ ion?

callisto · Answer

Sorry, probably i made a mistake.. From google it says it is an acid (weak acid) http://answers.yahoo.com/question/index?qid=20071209163509AAh7vF4 I have to check it again... Sorry!!!! :(

anonymous · Answer

Its alright. Thank you very much. Very very informative.  :]