What minimum concentration of k2co3 is required to cause the precipitation of the cation that precipitates first?

The concentration is ion dependent

Explanation:

The concentration is dependent on the amount of the ions in the solution. This is the rate-determination factor. For a reaction to precipitate, there should be enough ions in the solution. In addition, the Ksp plays an important factor in the reaction. This happens when the amount of ions formed is derived from a strong ionic solution. This then drives the reaction forward.