Predicting solubility. Using the table of solubilities we can now predict which of the products of a double replacement reaction will be insoluble ( form solids or precipitates : have low solubilities) and which will remain soluble. Pb(NO 3 ) 2 (aq) + 2 KI(aq) PbI 2 (s) + 2KNO 3 (aq).
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Pb2+(aq) + 2 NO3- (aq) + 2 K- (aq) + 2 I- (aq) PbI2 (s) + 2 K+ (aq) + 2 NO3- (aq)
Pb2+ (aq) + 2 I- (aq) PbI2 (s)
Stays as a solid
AgNO3 (aq)+KI (aq) → AgI (?)+KNO3 (?)
AgNO3 (aq)+KI (aq)→AgI (s)+KNO3 (aq)
Ba2+ and Cu2+
PbCl2 ppt outs
CuS ppt out
Ba3 (PO4)2 ppt out
1. Ionic Substances ( containing a metal or NH describes how to separate the following ions, if they are dissolved together in a solution. The last ion may remain in solution.4- ion )
2. Acids (containing nonmetals with hydrogen written first in the formula)
3. Molecular (contain only nonmetals) in the formula)