So you know the charge of the cation. For example, because Iron isn't in group 1 (charge 1+) or group 2 (charge 2+), its charge is undetermined until you give it one with roman numerals. Iron (I) Carbonate - Fe2CO3 Iron (II) Carbonate - FeCO3 Iron (III) Carbonate - Fe2(CO3)3 Iron (IV) Carbonate - Fe(CO3)2 Although the above compounds are made using the same elements, the roman numerals make them different.
Sodium Carbonate is the disodium salt of the carbonate anion. Sodium is a +1 cation while carbonate is a -2 anion. It is a basic salt when dissolved in water. Sodium carbonate doesn't have a equation itself, but when dissolved in water (deionization), it looks like this: Na2CO3(s) <------> 2 Na+(aq) + (CO3)2-(aq) In words: solid sodium carbonate is in equilibrium with two aqueous sodium ions of +1 charge and one aqueous carbonate ion of…
What is the balanced equation for calcium phosphate reacts with sodium carbonate in a double replacement?
Ca(HCO3)2 Calcium cations are doubly charged (2+) Hydrogen carbonate (bicarbonate) are singly charged anions (1-) You'll need 2 bicarbonates to neutralize the 2+ charge of the Calcium in the compound. I like to remember: CO3 has a 2- charge HCO3 has a 1- charge (Look! the hydrogen neutralizes one of the previously existing charges)
Carbonate ions have a negative charge, and they therefore repel other carbonate ions (like charges repel, as described by Coulomb's Law). You can only have a group of carbonate ions in a material if that material also contains positively charged ions which will attract the negatively charged carbonate ions. Calcium carbonate is an example of such a material.