QUESTION 16 For the electrochemical cell of Zn | Zn2+ (0.95 M) || Cu2+ (0.50 M) | Cu, calculate equilibrium constant. Zn

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QUESTION 16
For the electrochemical cell of Zn | Zn2+ (0.95
M) || Cu2+ (0.50 M) | Cu, calculate equilibrium
constant.
Zn2+ + 2e- =
Zn E0 = -0.763 V
Cu2+ + 2e- =
Cu E0 = +0.337 V
1.59x10-26
1.21x1011
7.65x1036
1.45x1037
QUESTION 17
The concentration of Fe3+ in a sample solution
was determined by coulometry technique based on the following
half-cell reaction: Fe3+ (aq.) +
3e- = Fe (s). A total of 0.0234 g iron (Fe =
55.845 g /mole) was obtained. What was the constant current used if
it was passing through the cathode for 2.5 hours.
0.013 amp
0.0087 amp
0.0043 amp
0.13 amp
QUESTION 18
The current in an electrochemical cell is generated at a fixed
voltage and is proportional to the concentration of the analyte
present in the test solution. This method is referred to
as:
Potentiometry
Mass spectroscopy
Voltammetry
Coulometry
QUESTION 19
A pH electrode measures potential difference across glass
membrane using the principles of
Potentiometry
Mass spectroscopy
Voltammetry
Coulometry
QUESTION 20
Which of the following methods requires 100% current
efficiency?
Potentiometry
x-ray diffraction analysis
Voltammetry
Coulometry
QUESTION 21
The concentration of ________ in the filling solution must be
fixed in order to keep a reference electrode (Ag/AgCl or
Hg/Hg 2Cl 2) potential
constant.
NO3-
O2
H2
Cl-