Being able to predict the products of a chemical reaction is very useful to chemists and other professionals. For example, water quality engineers can test water samples for the presence of different ions. If they know the product of a chemical reaction,then they can determine the presence of certain ions.
The following table can be used to predict the solubility of a salt.
A higher guideline number always takes precedence over a lower guideline number.
Example1: Silver Nitrate AgNO3
Cation: Ag+ Anion: NO3-
Nitrate guideline=1 and soluble
Silver ion guide line is 2 and insoluble
Since nitrate ion guide line is higher than silver ion guide line the salt is soluble in water.
Example 2: AgCl
Ag+ ion guideline: 2 and insoluble
Cl- ion guideine is 3 and soluble
The salt is insoluble.
Example 3: Calcium Hydroxide, Ca(OH)2
Ca+ ion guide line is 4 and is insoluble
OH- ion is 2 ans insoluble
so Ca(OH)2 is an insoluble salt.
Example 4: Lead Sulphate PbSO4
Pb: guide line 2: Insoluble
SO4: guideline 5-soluble
PbSO4 is insoluble
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