Module 6 - The Nernst Equation

Question 1

Volt

Answer 1

1 volt means that it takes one Joule (J) to move one coulomb of charge

Question 2

Work equation

Answer 2

Work = RxT(K)xln(cᵢ/cₒ)

ln 1 = 0 so when cᵢ=cₒ no work needs to be done

Question 3

Nernst equation

Answer 3

V = ((RxT)/(zxF)) x ln(cₒ/cᵢ)

R = 8.314
F = 9.65
z = charge on the ion
T = body temp (310K)

Question 4

log version of the Nernst equation

Answer 4

V = ((2.303xRxT)/(zxF)) x log(cₒ/cᵢ)

V (V) = (0.0615/z) x log(cₒ/cᵢ)

V = CONVERT TO mV FOR CALCS (x1000)
R = 8.314
F = 9.65
z = charge on the ion
T = body temp (310K)

Question 5

Values of ions for the Nernst equation

Answer 5

ion - z value - inside - outside - ratio
K⁺ - +1 - 15 - 150 - 1:10
Na⁺ - +1 - 100 - 5 - 20:1
Cl⁻ - -1 - 0.0002 - 2 - 10000:1
Ca²⁺ - +2 - 13 - 150 - 1:11.5

Question 6

Capacitors

Answer 6

A device for storing energy via separation of electrical charge, often used to deliver high voltage quickly (defibs and tasers)

Charge “stored” on two plates separated by an insulator