Answer to Question #238828 in General Chemistry for Shaji

Question

Iam doing descaling for my chiller to remove CaCO3 scale, by circulating mild acid solution through the scaled pipes continuously. Over period of time, the Ca concentration in solution increase due to dissolution of scale in solution.

My question is, whats the maximum ppm of Ca can dissolve in that certain solution (its circulating continuously for may hours- But acid powder will add off and on to maintain pH below 3 aprox, but no water change ). I guess after a certain ppm of Ca, any more Ca scale wont dissove - Please correct me if I am wrong- and what will be the max ppm of Ca that solution can afford ?

Answer 1

The maximum ppm of Ca that can dissolve for that case is 14 mg/L