posted by Jessica on .
Addition of which of the following substances will increase the solubility of CuCO3 (s) in water ?
CuCO3 ---- Cu^2+ (aq) +2 CO3^2- (aq)
1. Aqueous hydrochloric acid
2. Aqueous sodium carbonate
3. Solid copper (II) carbonate
a) 1 only
b) 2 only
c) 3 only
d) 1 and 3 only
e) 1,2 and 3 only
You haven't written the correct equation. It should be
CuCO3(s) ==> Cu^2+(aq) + CO3^2-(aq)
I'll give you a couple of hints.
Adding HCl will react with CO3^2- to form H2O and CO2, thus decreasing CO3^2-. Remember Le Chatelier's Principle--decreasing CO3^2- will drive the reaction which way?
Adding Na2CO3 will increase (CO3^2-). Which way will that drive the reaction.
Adding solid CuCO3. You already have solid CuCO3 present; adding more will have no effect.