Elechtrochemistry

17

Reduction

3+ 2+

Oxidation

3+2+

F = (6.022 x 1023 mol-1) x (1.602192 x 10-19 C) = 96,484 C mol-1

How much? – Faraday’s constant.

Faraday

Electricity

Current = Charge/time - I = Q/t [Ampere]=[Coulomb]/[sec]

Potential = Current x Resistance - E = I R (Ohms law)[Volt]=[Ampere] [Ohm]

So what is resistance?

NB: Potential is relative!

Work = Potential x Charge - W = E q [Joule] = [Volt] [Coulomb]

NERNST EQUATION

NERNST EQUATION

At 25 oC

NERNST EQUATION

Walther Hermann Nernst 1864–1941

NERNST EQUATION

NERNST EQUATION

THERMODYNAMICS and equilibrium

THERMODYNAMICS and equilibrium

NERNST EQUATION

0.50 M AgNO3(aq) 0.010 M Cd(NO3)2(aq)

0.50 M AgNO3(aq)

0.010 M Cd(NO3)2(aq)

0.50 M AgNO3(aq)

0.010 M Cd(NO3)2(aq)

My way:

Ion selective electrode

Ion selective electrode

Ion selective electrode

Ion selective electrode

Ion selective electrode

Ion selective electrode

Ion selective electrode

Ion selective electrode

BUN: 7 to 20 mg/dL CO2 (carbon dioxide): 20 to 29 mmol/L

Creatinine: 0.8 to 1.4 mg/dL Glucose: 64 to 128 mg/dL

Serum chloride: 101 to 111 mmol/L Serum potassium: 3.7 to 5.2 mEq/L Serum sodium: 136 to 144 mEq/L

CHEM-7 is a group of blood tests that provides information about your body's metabolism. The test is commonly called a basic metabolic panel.

Ion selective electrode

SelectivityAnd

interference

NERNST EQUATION

Measure E to determine 1 unknown concentration(…..so fix the other concentrations)

Reference electrodes

Reference electrodes

My way:

Reference electrodes