[NewCandle] Measuring Half-Cell Charge

[Frederick Sparber]

More refresher info.  15 to 50 microfarads per square centimeter is a bunch.

http://electrochem.cwru.edu/ed/encycl/art-c03-elchem-cap.htm

On 9/11/07, Frederick Sparber <fsparber at gmail.com> wrote:
> A Half-Cell refresher from Wiki.
>
> Lots of choices for the electrolyte surrounded by the electrode rather
> than the opposite.
>
> " A half cell is a structure that contains a conductive electrode and
> a surrounding conductive electrolyte separated by a
> naturally-occurring Helmholtz double layer. Chemical reactions within
> this layer momentarily pump electric charges between the electrode and
> the electrolyte, resulting in a potential difference between the
> electrode and the electrolyte. The typical reaction involves a metal
> atom in the electrode being dissolved and transported as a positive
> ion across the double layer, causing the electrolyte to acquire a net
> positive charge while the electrode acquires a net negative charge.
> The growing potential difference creates an intense electric field
> within the double layer, and the potential rises in value until the
> field halts the net charge-pumping reactions."
>
> "A standard half cell, used in electrochemistry, consists of a metal
> electrode in a 1 molar aqueous solution of the metal's salt, at 298
> Kelvin (25o Celsius). The electrochemical series, which consists of
> standard electrode potentials and is closely related to the reactivity
> series, was generated by measuring the between the metal half cell in
> a circuit with a standard hydrogen half cell, connected by a salt
> bridge."
>
> Fred
>
> On 9/11/07, Frederick Sparber <fsparber at gmail.com> wrote:
> > Hi Keith and Nick.
> >
> > I will get back to repeating the pendulum experiment when my able
> > assistant is available, but I strongly recommend a short key-chain
> > laser pointer (about 2.5 inches long) that range in price from $5.00
> > and up, attached to the bottom of the float.
> >
> > Shining it on a quadrille tablet or such would help too.
> >
> > Fred
> >
>