What is the formula of the compound formed between the ammonium ion and the carbonate ion? Hint: Carbonate (CO3) can be treated as a single unit with a 2- charge, whereas Ammonium (NH4) also can be treated as a single unit with a 1+ charge.
a) NH4CO3
b) NH4(CO3)2
c) (NH4)2CO3
d) (NH4)3CO3