Using Tables F & G

Table F problems solubility guidelines for substances in water solubility ranges from very low solubility (basically insoluble) to very soluble table F: use to predict if compound is soluble or insoluble left side shows soluble cmpds & exceptions right side shows insoluble cmpds & exceptions

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+1 soluble – cmpd with HCO3-1 insoluble – sulfates with Ba+2 soluble – cmpd with a Group 1 ion insoluble - most carbonates insoluble – most phosphates soluble – hydroxide with Ca+2

Use Table F to determine solubility of products formed in DR rxns

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

Table G problems shows amount solute required for given amount of solvent Or shows amount solvent required for given amount of solute involves setting up a proportion

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 300 g H2O X = 126g KCl

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 = 227.3 g H2O

Ex: precipitation word problem 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?

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