Name _______________
LeChatlier Common Ion Effect
1. Given the system at equilibrium:
AgCl(s) « Ag+(aq) + Cl–(aq)
When 0.1 M HCl is added to the system, the point of equilibrium will shift to the
1)
2)
3)
4)
right and the concentration of Ag+ will decrease
right and the concentration of Ag+ will increase
left and the concentration of Ag+ (aq) will decrease
left and the concentration of Ag+ (aq) will increase
2. Given the reaction at equilibrium:
AgI(s) « Ag+(aq) + I–(aq)
What happens as KI(s) is added to the solution?
1)
2)
3)
4)
The concentration of Ag+ (aq) decreases and the concentration of I –(aq) increases.
The concentration of Ag+ (aq) decreases and the concentration of I –(aq) remains the same.
The concentration of Ag+ (aq) increases and the concentration of I–(aq) increases.
The concentration of Ag+ (aq) increases and the concentration of I–(aq) remains the same.
3. Given the reaction at equilibrium:
AgBr(s) « Ag+(aq) + Br–(aq)
Which change occurs when KBr(s) is dissolved in the reaction mixture?
1)
2)
3)
4)
The amount of AgBr(s) decreases.
The amount of AgBr(s) remains the same.
The concentration of Ag+ (aq) decreases.
The concentration of Ag+ (aq) remains the same.
4. Given the solution at equilibrium:
PbI2(s) « Pb2+(aq) + 2I–(aq)
The addition of which nitrate salt will cause a decrease in the concentration of I–(aq)?
1) Pb(NO 3) 2
2) Ca(NO 3) 2
3) LiNO 3
4) KNO3
5. Given the system at equilibrium:
PbCO3(s) « Pb2+(aq) + CO32–(aq)
How will the addition of Na2CO3(aq) affect [Pb2+](aq) and the mass of PbCO3(s)?
1)
2)
3)
4)
[Pb 2+](aq) will decrease and the mass of PbCO 3(s) Will decrease.
[Pb 2+](aq) will decrease and the mass of PbCO 3(s) will increase.
[Pb 2+](aq) will increase and the mass of PbCO 3(s) will decrease.
[Pb 2+](aq) will increase and the mass of PbCO 3(s) will increase.
Date: _________
LeChatlier Common Ion Effect
6. Given the solution at equilibrium:
CaSO4(s)
Ca2+ (aq) + SO42-(aq)
When Na2SO4 is added to the system, how will
the equilibrium shift?
1) The amount of CaSO 4(s) will decrease, and
the concentration of Ca2+(aq) will decrease.
2) The amount of CaSO 4(s) will decrease, and
the concentration of Ca2+(aq) will increase.
3) The amount of CaSO 4(s) will increase, and
the concentration of Ca2+(aq) will decrease.
4) The amount of CaSO 4(s) Will increase, and the concentration of Ca 2+(aq) will increase.
7. Given the reaction at equilibrium:
BaCrO4(s) « Ba2+ (aq) + CrO42–(aq)
Which substance, when added to the mixture will cause an increase in the amount of BaCrO 4(s)?
1) K2CO 3
2) CaCO 3
3) BaCl2
4) CaCl2
8. Given the system at equilibrium:
If Na3PO4(s) is added, there will be a decrease in the concentration of
1) Na+
2) PO 43–
3) H3O+
4) H2O