To write the correct formula for something, you need to know
a) how is it bonded?
b) what are the charges on each component?
c) what is the chemical symbol for each component?
Here's how we do it:-
Here's a compound ammonium hydroxide
Now, how is it bonded? Ionic
The way we write ammonium is NH4 and it has a single positive charge.
Similarly, hydroxide is written OH and has a single negative charge.
All we need is for there to be equal positive and negative charges in the compund. There is one on ammonium and one on hydroxide, so we are balanced. Therefore, the formula is NH4OH.
At GCSE, it is best to know these elements off by heart:-
Silver (Ag+), Ammonium (NH4+), Zinc (Zn2+), Hydrogen (H+), Hydroxide (OH-), Nitrate (NH3-), Sulphate (SO42-) and Carbonate (CO32-)
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