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Transcript

Our salt bridge was made of a sodium nitrate solution soaked into filter paper.

We measured voltage with a Cen-tech voltage meter.

Zn(s) → Zn2+(aq) + 2e-Anode

Cu2+(aq) + 2e- → Cu(s) Cathode

Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s).

We also tested the voltage of 12 other metals we found in the lab closet.

Our hypothesis is that each metal will create a different voltage in our salt bridge because each metal has its own reduction potential.

A Voltaic Cell is an electrochemical cell that uses redox reactions to generate electricity. It consists of two separate half-cells. A half-cell is composed of an electrode (a strip of metal, M) within a solution containing Mn+ ions in which M is any arbitrary metal. The two half cells are linked together by a wire running from one electrode to the other. A salt bridge also connects to the half cells.

The Daniell cell was a great improvement over the existing technology used in the early days of battery development.

A later variant of the Daniell cell called the gravity cell or crowfoot cell was invented in the 1860s by a Frenchman named Callaud and became a popular choice for electrical telegraphy.

The Daniell cell is also the historical basis for the contemporary definition of the volt, which is the unit of electromotive force in the International System of Units. The definitions of electrical units that were proposed at the 1881 International Conference of Electricians were designed so that the electromotive force of the Daniell cell would be about 1.0 volts.With contemporary definitions, the standard potential of the Daniell cell at 25 °C is actually 1.10 V.

  • Two 500ml beaker
  • Filter paper
  • Copper wire
  • Cen-tech volt meter
  • 250ml sodium nitrate for use in salt bridge
  • 50g Copper sulfate
  • 50g Zinc sulfate
  • 175 ml water in each beaker
  • zinc,copper,magnesium,manganese,gallium, silicon, aluminum,silver, gold, vanadium, key, silver tongs, tin.

Voltaic Cell

Tungsten

Gallium

Tin

Br

Key: Brass

Gold

Gold Ring

Vanadium

Vanadum

Vanadium

Magnesium shavings

Manganese pieces

Abstract

This lab experiment was performed in order to determine the voltage for different metals with constant ionic solutions and a salt bridge. We predicted that the best type of battery would be made with a zinc metal and a zinc sulfate solution in beaker 1 and a copper metal and copper sulfate solution in beaker 2.

Silicon (Not a meteorite)

Materials

Voltaic Cell

Introduction

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