1. Using Tables F & G

2. Table F problems Solubility guidelines for substances in water
solubility ranges from very low solubility (basically insoluble) to very soluble
table F used to predict if given compound is soluble or insoluble

3. To use Table F Separate ionic compound into positive & negative ions
Scan for both in Table F
Left side of Table F shows soluble compounds with exceptions
Right side of Table F shows insoluble compounds with exceptions

4. Predict solubility of LiCl NH4F Ca(HCO3)2 BaSO4 K2CO3 CaCO3 Mg3(PO4)2
Ca(OH)2
Soluble – cmpd with a Group 1 ion
Soluble – cmpd with NH4+
Soluble – cmpd with HCO3-
Insoluble – sulfates with Ba+
Soluble – cmpd with a Group 1 ion
Insoluble - most carbonates
Insoluble – most phosphates
Soluble – hydroxide with Ca+2

5. Why do we need to predict solubility?
To determine solubility of precipitates formed in DR rxns

6. Predicting Products
AgNO3(aq) + KCl(aq)  ?
AgCl(s) + KNO3(aq)

7. Table G problems
Shows amount of solute or solvent required for given amount of each
Involves setting up a proportion
Precipitation problems

8. Problem:
How much KCl will dissolve in 300 grams of water at 50C?
Use the graph to set up a proportion
42 g KCl = X g KCl
100 g H2O g H2O
X = 126g KCl

9. How much H2O is required to just dissolve 200 g NaNO3 at 20C?
88 g NaNO3 = 100 g H2O
200 g NaNO3
X g of H2O
X = g H2O

10. Precipitation problems
A saturated solution of KNO3 is prepared in 100 g of water at 50C and then cooled down to 10C. How much KNO3 will precipitate?

11. 88 g KNO3 in 100 g H2O at 50C
20 g KNO3 in 100 g H2O at 10C
88 g – 20 g = 68 g KNO3 precipitates