Question- A water with a calcium concentration of (Ca2+) = 80mg/L is in contact with the mineral fluorite (CaF2). Calculate the solubility of fluorite at a temperature T=25°C. pKs of fluorite is 10.96 at 25°C.
I get the basics of solubility calculation however I am unsure how to incorporate the 80mg/L. Any help is greatly appreciated