Question

find +ion and -ion in CaCO3​

Answer 1

Calcium Carbonate (CaCO3) contains 40% calcium , 12% carbon and 48 % oxygen by mass . Knowing that the law of constant proportions holds good , calculate the mass of the constituent elements in 2g of calcium carbonate

Answer 2

I do not know the appropriate answer but i think that

positive ion is Ca+ (calcium cation)

and negative ion is CO3- (carbonate anion)