Solubility Rules

Question 0

Ammonium

Answer 0

NH+4

Soluble

Question 1

Alkali metals

Answer 1

Soluble
Group 1A
Li+, Na+, K+, Rb+, Cs+

Question 2

Nitrates, Bicarbonates, Chlorates, Sulfates

Answer 2

Compounds that contain NO3-, HCO3-, ClO3-, SO4-2

Soluble

Question 3

Halides

Answer 3

Compounds that contain halogens
Soluble
Halogens are: F-, Cl-, Br-, I-
Group 7A
Except halides of Ag+, Hg2+2, Pb+2 are insoluble

Question 4

Ba+2

Answer 4

Weird one.

• Ba(OH)2 is soluble; hydroxides (OH-) of Ba are soluble;
• BaSO4 is insoluble; sulfates (SO4-2) of Ba are insoluble.

Question 5

OH-

Answer 5

Compounds with hydroxide are insoluble…

Except if they contain Ba+2 or alkali metals

Question 7

Carbonates, Phosphates, Chromates, Sulfides

Answer 7

Compounds that contain CO3-2, PO4-3, CrO4-2, S-2
Insoluble
Except if they contain NH4+ or alkali metals

Question 8

Nitrates

Answer 8

NO3-

Soluble

Question 9

Bicarbonates

Answer 9

HCO3-

Soluble

Question 10

Chlorates

Answer 10

ClO3-

Soluble

Question 11

Sulfates

Answer 11

SO4-2
Soluble
Except sulfates of Ag+, Ca+2, Sr+2, Ba+2, Hg2+2, Pb+2

Question 12

Carbonates

Answer 12

CO3-2
Insoluble
Except if they contain NH4+ or alkali metals

Question 13

Phosphates

Answer 13

PO4-3
Insoluble
Except if they contain NH4+ or alkali metals

Question 14

Chromates

Answer 14

CrO4-2
Insoluble
Except if they contain NH4+ or alkali metals

Question 15

Sulfides

Answer 15

S-2
Insoluble
Except if they contain NH4+ or alkali metals