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An experiment measuring the potential difference generated by various simple electrochemical cell

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  • Essay length: 2191 words
  • Submitted: 30/10/2007
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AS and A Level Molecules & Cells

The first 200 words of this essay...

An experiment measuring the potential difference generated by various simple electrochemical cells.

Aim:

The purpose of this experiment was to correctly construct three simple electrochemical cells and then measure the potential difference, including the polarity, between the two metal electrodes in each cell.

Apparatus:

==> Chemicals/ substances:

* Copper sulphate solution (1M)

* Strip of copper foil

* Zinc sulphate solution (1M)

* Strip of zinc foil

* Silver nitrate solution (1M)

* Silver wire

* Saturated potassium nitrate solution

==> Additional apparatus:

* Safety goggles

* Emery paper

* 4 beakers

* 3 connecting leads with crocodile clips

* Filter paper

* High resistance voltmeter

Method:

==> Clean each metal strip with separate pieces of emery paper (if necessary).

==> Construct the three listed electrochemical cells by the following method:

Cell

Half- cells

(1)

Zn2+ (aq) + 2e- ? Zn (s)

Cu2+ (aq) + 2e- ? Cu(s)

(2)

Ag+ (aq) +e- ? Ag(s)

Cu2+ (aq) + 2e- ? Cu(s)

(3)

Ag+ (aq) +e-

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