Write the net ionic equation for the precipitation of cobalt(ii) carbonate from aqueous solution

Precipitation reactions occurs when cations and anions in aqueous solution combine to form an insoluble ionic solid called a precipitate. A precipitate normally forms if the product of the reaction of the ions is insoluble in water. 
In this case the net ionic reaction for the precipitation of Cobalt (ii) carbonate will be;
  Co^2+ (aq) + CO3^2-(aq) = CoCO3(s)

The net ionic reaction for the precipitation of Cobalt (ii) carbonate will be:
  Co²+ (aq) + CO3²-(aq) = CoCO3(s)
Precipitation in a chemical reaction occurs when chemical products are insoluble in a solution, or when the solution cannot hold the total volume of solutes present. precipitation in the water cycle occurs when water vapor condenses from the air and falls as water or ice.