Solubility Rules

Question 1

Li⁺, Na⁺, K⁺, NH₄⁺

Answer 1

SOLUBLE

NO EXCEPTIONS

Question 2

NO₃^-, C₂H₃O₂^-, ClO₄^-

Answer 2

SOLUBLE

NO EXCEPTIONS

Question 3

Cl^-, Br^-, I^-

Answer 3

SOLUBLE

except when any of these ions pairs with

Cu⁺, Ag⁺, Hg₂²⁺, or Pb²⁺

then the compound is insoluble.

Question 4

F^-

Answer 4

SOLUBLE

except when paired with

Pb²⁺ and fluorides of Group 2A(2)

then it is insoluble.

Question 5

SO₄^2-

Answer 5

SOLUBLE

except when it is paired with

Ag⁺, Sr²⁺, Ba²⁺, Pb²⁺, or Ca²⁺

then the compound it insoluble.

Question 6

OH^-, S^2-

Answer 6

INSOLUBLE

exception:

both are soluble when paired with Li⁺, Na⁺, K⁺, or NH₄⁺.

S^2- is soluble when paired with Ca²⁺, Sr²⁺, or Ba²⁺.

OH^- is slightly soluble (considered insoluble) when paired with Ca²⁺, Sr²⁺, or Ba²⁺.

Question 7

CO₃^2-, PO₄^3-

Answer 7

INSOLUBLE

except when either of these ions pairs with

Li⁺, Na⁺, K⁺, or NH₄⁺

then the compound is soluble.