Open Question
Predict whether each of the following ionic compounds is soluble in water:d. K₂O
5. Classification & Balancing of Chemical Reactions
Solubility Rules
Struggling with GOB Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which pair of compounds is insoluble in water?
A
PbSO4 and Pb3(PO4)2
B
Na2S and CuS
C
(NH4)2SO4 and AgI
D
AgNO3 and KNO3
Verified step by step guidance1
Identify the solubility rules for common ionic compounds in water. For example, most sulfates (SO4^2-) are soluble, except for those of barium, lead, and calcium.
Examine the first pair: PbSO4 and Pb3(PO4)2. According to solubility rules, lead sulfate (PbSO4) is insoluble in water, and lead phosphate (Pb3(PO4)2) is also generally insoluble.
Consider the second pair: Na2S and CuS. Sodium sulfide (Na2S) is soluble because all sodium salts are soluble, but copper sulfide (CuS) is insoluble.
Look at the third pair: (NH4)2SO4 and AgI. Ammonium sulfate ((NH4)2SO4) is soluble, but silver iodide (AgI) is insoluble.
Review the fourth pair: AgNO3 and KNO3. Both silver nitrate (AgNO3) and potassium nitrate (KNO3) are soluble in water.
Related Videos
Related Practice
Solubility Rules practice set
Problem sets built by lead tutorsExpert video explanations