Which is the correct expression for Q for the following reaction? H 2 SO 4 (g) +
ID: 1072908 • Letter: W
Question
Which is the correct expression for Q for the following reaction?
H2SO4(g) + OH-(aq) <=> H2O(l) + SO42-(aq) [NOT BALANCED!]
A.
[H2O]2[SO42-]
Q = _______________
[H2SO4][OH-]2
B.
[H2O] [SO42-]
Q = ______________
[H2SO4][OH-]
C.
[H2SO4][OH-]2
Q = _______________
[SO42-]
D.
[SO42-]
Q = _______________
[H2SO4][OH-]2
1 points
QUESTION 2
What is the correct expression for Qp for the following equation?
H2SO4(g) + OH-(aq) <=> H2O(l) + SO42-(aq) [NOT BALANCED!]
a.
[ SO42-]
Qp = _______________
PH2SO4 [OH-]2
b.
PH2O2 PSO42-
Q = _______________
PH2SO4 POH-2
c.
PH2SO4 [OH-]2
Qp = _______________
[H2SO4]
d.
PSO42-
Qp = _______________
PH2SO4 POH-2
1 points
QUESTION 3
When Pb(NO3) (aq) and LiI (aq) are mixed the following reaction occurs.
Pb2+(aq) + 2 I-(aq) <=> PbI2 (s)
Write Q for this reaction.
a.
[Pb2+] [I-]2
Q = ____________
[PbI2]
b.
1
Q = ____________
[Pb2+] [I-]2
c.
[PbI2]
Q = ____________
[Pb2+] [I-]2
d.
Q = [Pb2+] [I-]2
1 points
QUESTION 4
Hydrofluoric acid (HF) is a "weak" acid, which means that it is subject to the following equilibrium,
HF(aq) <=> H+(aq) + F-(aq)
A sample of HF is allowed to come to equilibrium and the measured concentrations are
[HF] = 0.0100M; [H+] = 0.00100M; [F-] = 0.00100M. What is the value of K?
1 points
QUESTION 5
A certain weak acid (HX) is subject to the following equilibrium,
HX(aq) <=> H+(aq) + X-(aq) K = 4.00 x 10-4
A sample of HX is prepared, and a short time later the following concentrations are measured:
[HF] = 0.0250M; [H+] = 0.00100M; [F-] = 0.00100M. Has this sample come to equilibrium?
Yes
No
Not enough information to answer.
A.
[H2O]2[SO42-]
Q = _______________
[H2SO4][OH-]2
B.
[H2O] [SO42-]
Q = ______________
[H2SO4][OH-]
C.
[H2SO4][OH-]2
Q = _______________
[SO42-]
D.
[SO42-]
Q = _______________
[H2SO4][OH-]2
Explanation / Answer
Q is defined as ratio of concentration of products to concentration of reactants. While Qp is defined as ratio of partial pressure of products to partial pressure of reactants.
While writing expression of Q or Qp concentration or pressures of pure solids and liquids are ignored.
Using above points answers are:-
1. D
2. D
3. D
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