Predict the name of the salt formed when copper oxide reacts with nitric acid.
The salt formed is copper nitrate.
|Charge on ion||Examples|
|+1||K+, Na+, Li+|
|+2||Mg2+, Ca2+, Cu2+, Fe2+|
|-1||Cl-, Br-, I-, NO3-|
Notice that ions of group 1 elements have a charge of +1, and ions of group 2 elements have a charge of +2. The group 7 element ions have a charge of -1, and the group 6 element ions have a charge of -2.
What is the formula of aluminium sulfate?
The formulae of the ions are Al3+ and SO42-.
The sum of the charges on the ions in the neutral salt must be zero. Two Al3+ ions have a total charge of +6 and three SO42- ions have a total charge of -6.
So the formula is Al2(SO4)3.
What is the formula of magnesium chloride?