Which of the following compounds is not appreciably more soluble in 1 M HNO3 than in pure water? and why?

Question

the compounds are:
A) Ca(OH)2 B) ZnS C) Pbl2 D) Ca3(PO4)2 E) MgCO3

one more question:
Which of the following compounds would be more soluble in 1 M NH3 than in pure water? and why?

A) BaSO4 B) AgBr C) Pbl2 D) BaF2 E) Ca(OH)2

Answer 1

(A) PbI2
Reason: solubility will be changed when the count-ion concentration is altered. For Ca(OH)2, OH- is reduced in acid, For ZnS, H2S can be vaporized. For Ca3(PO4)2, HPO4 is a very weak acid, and for MgCO3, the product H2CO3 will dissociate to H2O and CO2(gas).

(B) AgBr
NH3 is a chelating agent for transition metals, and Ag is the only transition metal in this group.