Question

Select the solutions that AgCl will be expected to be the least soluble and will be expected to be the most soluble at 25°C?

A. 0.1 M HCl

B. 0.1 M KCl

C. 0.1 M BaCl₂

D. 0.1 M NH₄NO₃

E. Pure Water

Answer 1

Q1-

Solubility will be least in BaCl_{​​​2 ​​​​​​​​​​​​}, because BaCl2 and AgCl both has Cl- as common ion. And out of HCl, KCl and BaCl2 , BaCl2 has Maximum Cl- ion.

​​​​​​As Cl- is present already, a small dissociation of AgCl will bring equilibrium. So dissociation is depressed.

2

Nh4OH or amine form a complex with Ag+ and remove Ag+ ion from solution. Thus equilibrium is disturbed. So more AgCl will dissociate to reach equilibrium.

Thus it will increase the dissociation of AgCl.