The reduction potential of ferricyanide to ferrocyanide ion occurs at +0.36 V when both ions are 1M in concentration at 25 °C. The same process occurs at +0.72 V when the medium is made 1M in HCIO4. What is the oxidation potential of ferrocyanide/ferricyanide? Eox = -0.72 V and Eoxº = -0.36 V Eox = -0.36 V and Eoxº = -0.72 V Eox = +0.36 V and Ex = +0.72 V Eox = +0.72 V and Eoxº¹ = +0.36 V

K124.

A fluoride ISE immersed in 1 x 10•2 mol dm solution of sodium fluoride gives a potential of 35,2 mV and when it is immersed in a tooth paste solution it gives a potential of 30,2 mV. What is the concentration of fluoride ion in the toothpaste?

The F− concentration of a solution was determined by measurements with a liquidmembrane electrode. The electrode system developed a potential of 0.5021 V when immersed in 25.00 mL of the sample, and 0.4213 V after the addition of 2.00 mL of 5.45 x 10−2 M NaF. Calculate pF for the sample.

Oxidation of lactate by cytochrome C (represented as cytochrome C (Fe3 +)) to pyruvate is an important biological reaction.Below are the reduction reactions and standard reduction potentials (E °) at pH = 7 and 25 ° C.Pyruvate + 2H + + 2e- = Lactate - (E ° = -0.185 V)Cytochrome C (Fe3 +) + e - = Cytochrome C (Fe2 +) (E ° = 0.254 V) Considering the Gibss free energy and Nernst equations, calculate the following equilibrium ratio (K) at 25 ° C, pH = 7.

Use standard reduction potentials to calculate the standard free energy change in kJ for the reaction: 2H+ (aq) + Hg(1)→ H₂(g) + Hg²+ (aq) 2H+ (aq) + 2e¯ → H₂(g) Fº red 2+ Hg2 (aq) + 2e¯ → Hg(1) AGO = || kJ K for this reaction would be Eº red = 0.000 V = = 0.855 V than one.