1. Estimate the biological standard potential of the NAD+/NADH couple at 25?C : NAD+(aq)+H+(aq)+2e??NADH(aq),E?=?0.11V 2. Estimate the biological standard potential of the half-reaction O2?+4H++4e??2H2O at 25?C given its value +1.23V under thermodynamic standard conditions. 3. Three different galvanic cells have standard electromotive forces E solutionspile.com

Question

1. Estimate the biological standard potential of the

NAD^{+} / NADH

couple at

2 5^{?} C

:

NAD^{+} (aq) + H^{+} (aq) + 2 e^{?} ? NADH (aq), E^{?} = ? 0.11 V

2. Estimate the biological standard potential of the half-reaction

O_{2} + 4 H^{+} + 4 e^{?} ? 2 H 2 O

at

2 5^{?} C

given its value

+ 1.23 V

under thermodynamic standard conditions. 3. Three different galvanic cells have standard electromotive forces

E^{0}

of

0.01, 0.1

, and

1.0 V

, respectively, at

2 5^{?} C

. Calculate the equilibrium constants of the reactions that occur in these cells assuming the charge number

n = 1

for each reaction. 4. When a hydrogen electrode and a normal electrode are immersed in a solution at

2 5^{?} C

a potential of

0.664 V

is obtained. Calculate (a) the

pH

and (b) the hydrogen-ion activity. 5. What range should a voltmeter have (in volts) to display changes of

pH

from 1 to

14 at 2 5^{?} C

if it is arranged to give a reading of 0 when

pH = 7

?

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