digplanet beta 1: Athena
Share digplanet:


Applied sciences






















Copper coulometer

The copper coulometer is a one application for the copper-copper(II) sulfate electrode. Such a coulometer consists of two identical copper electrodes immersed in slightly acidic pH-buffered solution of copper(II) sulfate. Passing of current through the element leads to the anodic dissolution of the metal on anode and simultaneous deposition of copper ions on the cathode. These reactions have 100% efficiency over a wide range of current density.


The amount of electric charge (quantity of electricity) passed through the cell can easily be determined by measuring the change in mass of either electrode and calculating:

Q = \frac{2\Delta m F}{63.546},


  • Q is the quantity of electricity (coulombs)
  • \Delta m is the mass transported (gm)
  • the factor 2 is due to the transport of divalent ions
  • F is the Faraday constant (96485.3383 coulombs per mole)
  • 63.546 is the atomic weight of copper (as grams per mole)

Although this apparatus is interesting from a theoretical and historical point of view, present-day electronic measurement of time and electric current provide in their multiplication the amount of passed coulombs much easier, with greater precision, and in a shorter period of time than is possible by weighing the electrodes.

See also[edit]


Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Copper_coulometer — Please support Wikipedia.
This page uses Creative Commons Licensed content from Wikipedia. A portion of the proceeds from advertising on Digplanet goes to supporting Wikipedia.
35 videos foundNext > 

AP chemistry frq #10 electrochemistry Coulometry

Electrochemistry is covered looking at voltage of cells, coulometry calculations and comparing thermodynamics with electrochemistry. Problem can be found ...

Scharlau Aquagent® Coulometric Karl Fischer Titration Using Cells without Diaphragm

Coulometry lab electroplating Zn onto a penny with data

Mass of zinc deposited onto the penny: 0.001 grams Time current was running: 62 seconds Determine the current This lab involves an electrolysis reaction of a ...

Faraday's Second Law of Electrolysis

Check out us at:http://chemistry.tutorvista.com/physical-chemistry/electrolysis.html Faraday's Second Law of Electrolysis The amounts of different substances ...

Constant Potential Coulometry

Copper to Silver to Gold: The Penny Alchemy Demo

This brief, jittery video shows the experimental set up for making a copper penny appear silver or golden. In the first step, a thin layer of zinc metal i plated ...

The No. 1 in Karl Fischer titration

Metrohm Karl Fischer titration, sample preparation, volumetric and coulometric analysis, from gaseous to liquid to viscous to solid matrices.

Materials engineering flashcards - polymers and liquid crystals

IB chemistry HL materials option A4 and A5 review flashcards covering polymers and liquid crystals. A link to flashcards over A1-A3 and A6 is available at the ...

The Use of Ovens in Karl Fischer Titration: Gas Flow and Sample Addition

Video demonstrates the use of ovens to release sample moisture for subsequent Karl Fischer Titration. The Use of Ovens: Many substances release their ...

Instrumental set-up of Electrogravimetry

Mount Royal University Department of Chemistry Training Video Title: "Instrumental set-up of Electrogravimetry" Credit: MRU Department of Chemistry.

35 videos foundNext > 

1 news items

Products Finishing Magazine
Thu, 05 Jul 2012 07:36:40 -0700

Nickel electrodeposition onto copper substrates was carried out from a Watts bath in the presence of monosodium glutamate (MSG) as a complexing agent. The study dealt with the influence of MSG concentrations on the cathodic current efficiency, cathodic ...

Oops, we seem to be having trouble contacting Twitter

Support Wikipedia

A portion of the proceeds from advertising on Digplanet goes to supporting Wikipedia. Please add your support for Wikipedia!

Searchlight Group

Digplanet also receives support from Searchlight Group. Visit Searchlight