Solubility rules

Question 1

Force of attraction between oppositely charged ions

Answer 1

This force tends to keep the ions in the solid state. When it is a major factor, then water solubility may be very low.

Question 2

NO3-

Answer 2

All nitrates are soluble

Question 3

Cl-

Answer 3

all chlorides are soluble except AgCl, Hg2Cl2, and PbCl2

Question 4

SO4^2-

Answer 4

Most sulfates are soluble. Exceptions include BaSO4, PbSO4, and SrSO4

Question 5

CO3^2-

Answer 5

All carbonates are insoluble except NH4^+ and those of the Group 1 elements.

Question 6

OH-

Answer 6

All hydroxides are insoluble except those of the Group 1 elements, Ba(OH)2, Sr(OH)2. Ca(OH)2 is slightly soluble.,

Question 7

S^2-

Answer 7

All sulfides are insoluble except those of the Group 1 and Group 2 elements and NH4+

Question 8

Forces of attraction between H2O molecules and the ions of the solid

Answer 8

This force tends to bring ions into solution. If this is the predominant factor, then the compound may be highly soluble in water.