Calculate the equilibrium constant for the reaction
S2O82-(aq) + 2 Fe2+(aq)
--> 2 Fe3+(aq) + 2 SO42-(aq) at
25.0°C, given that the standard cells potentials for the two half
reactions at this temperature are
S2O82-(aq) + 2 e- 2
SO42-(aq) E = +2.08 V
Fe3+(aq) + e- Fe2+(aq) E
= +0.77 V
Derive a balanced equation for the reaction occurring in the
cell:
Fe(s)|Fe2+(aq)||Fe3+(aq),Fe2+(aq)|Pt(s)
a.) If E?cell = 1.21 V, calculate ?G? for the
reaction.
b.) If E?cell=1.21V, calculate the equilibrium constant
for the reaction.
c.) Use the Nernst equation to determine the potential for the
cell:
Fe(s)|Fe2+(aq,1.0�10-3M)||Fe3+(aq,1.0�10-3M),Fe2+(aq,0.10M)|Pt(s)
Which reaction type is the following reaction?
Hg2(NO3)2 (aq) + 2KCl (aq) → 2KNO3 (aq) + Hg2Cl2 (s)
Suppose the cafeteria decides to make tacos for lunch one day.
Each taco will be made with one taco shell, two scoops of ground
beef, and three sccops of salsa. If the cafeteria has 150 taco
shells, 250 scoops of ground beef, and 300 scoops of salsa, how
many tacos can they make?
Predict the products of the following reaction
CaCl2 (aq)...
a)
Consider the following reaction at 298K.
2
Cu2+(aq) +
Hg (l)
------>2
Cu+(aq) +
Hg2+(aq)
Which of the following statements are correct?
Choose all that apply.
n = 1 mol electron
The reaction is product-favored.
delta Go < 0
Eocell < 0
K < 1
b)
Consider the following reaction at 298K.
3
Hg2+(aq) +
2 Cr (s)
------> 3 Hg
(l) + 2
Cr3+(aq)
Which of the following statements are correct?
Choose all that apply.
K > 1...
(a) For the reaction 2 A(aq) ⇋ 2 B(g) + C(g), the equilibrium
constant is 4.59 at 25.0oC. If the concentrations of B(aq) and
C(aq) are each 0.311 M, what concentration of A(aq) is required to
have a ΔG value of -6.66 kJ/mol? The temperature is 25.0oC.
(b) We have a buffer solution that was produced by adding 11.9 g
of NaOH to 2.000 L of a 0.666 M solution of HA(aq). The pH of the
buffer solution is 3.25...
Consider the following reaction :
Fe3+ (aq) + SCN- (aq) --->
Fe(SCN)2+ (aq)
Starting with 4.00 mL of .200 M Fe3+ (aq) in a
cuvette, 0.10 mL increments of 0.00100 M SCN- (aq) will
be added. Assume that because [Fe3+ (aq)] >>
[SCN- (aq)], the [Fe(SCN)2+] concentration
can be calculated from the limiting reagent, SCN-.
Calculate [Fe(SCN)2+].
Volume .00100 M KSCN mL
[Fe(SCN)2+] (M)
.10
.20
.30
.40
.50
.60
.70
.80
.90
1.00
PART D: Study of the Equilibrium: Fe3+(aq) + SCN–
(aq) ⇌ [FeSCN]
2+(aq)
pale yellow red
20. Which reagent(s) did you use to enhance the formation of
[FeSCN]
2+(aq)? Why?
21. Indicate which ion was added to or removed from the
equilibrium mixture, based on the reagent(s)
you chose in question 20.
22. Which reagent(s) did you use to enhance the formation of
Fe3+(aq)? Why?
23. Indicate which ion was added to or removed from the
equilibrium mixture, based on...
Dissociation Constant
For the dissociation reaction of a weak acid in water,
HA(aq)+H2O(l)?H3O+(aq)+A?(aq)
the equilibrium constant is the acid-dissociation
constant, Ka, and takes the form
Ka=[H3O+][A?][HA]
Weak bases accept a proton from water to give the conjugate acid
and OH? ions:
B(aq)+H2O(l)?BH+(aq)+OH?(aq)
The equilibrium constant Kb is called the
base-dissociation constant and can be found by the formula
Kb=[BH+][OH?][B]
When solving equilibrium-based expression, it is often helpful
to keep track of changing concentrations is through what is often
called an...
The following cell reaction furnishes 0.62V.
2Fe3+(aq) + Sn2+(aq) ---> 2
Fe2+(aq) + Sn4+(aq)
The maximum electrical energy per mole of Fe(III) ion is (1F =
9.65 x 104 C)
(A) 1.197 x 105 J/mole Fe(III) ion
(B) 2.394 x 105 J/mole Fe(III) ion
(C) 5.98 x 105 J/mole Fe(III) ion
(D) 5.98 x 104 J/mole Fe(III) ion
Correct answer is (C). Please explain why, thank you.