Factors Affecting Solubility Flashcards
1
Q
What are the three factors
A
- Presence of common ion
- pH
- Presence of complexing ions
2
Q
Characteristic of complex ions?
A
Form dative bond
3
Q
AlCl dissolved in NH3 ?
A
Ag+ (aq) + Cl-(aq) <=> AgCl(s)
Ag+(aq) + 2NH3(aq) <=> Ag(NH3)2+ (aq)
4
Q
Solubility of AgCl in
NH3(aq)
c.NH3
A
Soluble;
Soluble
5
Q
Solubility of AgBr in
NH3(aq)
c.NH3
A
Insoluble;
Soluble
6
Q
Solubility of AgI in
NH3(aq)
c.NH3
A
Insoluble
Insoluble
7
Q
Explain solubility of AgCl is NH3(aq)
A
- complex ion Formation lowers [Ag+]
- p.o.e shift to left;
- ionic pdt falls below Ksp
- > salt dissolves
8
Q
Why AgBr insoluble in NH3(aq)
A
- complex [Ag(NH3)2]+ lowers [Ag+];
- decreases [Ag+];
- ionic pdt > low Ksp
- > insoluble
9
Q
Why AgBr dissolve in cNH3
A
- high [NH3] causes complex ion Formation to occur to a large extent;
- [Ag+] decreases;
- ionic pdt < low Ksp
- > dissolves
10
Q
Why AgI dissolved in neither?
A
- Ksp so Low that even at high [NH3],
- ionic pdt still greater than Ksp
