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Investigating Metal Activity Differences

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Introduction

Investigating Metal Activity Differences Intro: Pennies minted prior to 1982 contain an alloy of copper and zinc, while those minted after 1982 contain mostly pure zinc covered with a thin layer of pure copper. The analysis is based on the differing reactivities of zinc and copper with hydrochloric acid. In hydrochloric acid, zinc reacts following the reaction of: Zns + 2HClaq --> ZnCl2aq + H2g While copper does not react with hydrochloric acid Cu + 2HCl --> CuCl2 + H2 No Reaction The procedure will involve cutting a penny into quarter-sections to expose the zinc core to the hydrochloric acid. We will weigh these sections and the place them into concentrated hydrochloric acid. The zinc will mostly likely dissolve away, leaving the copper shell behind because copper does not react with hydrochloric acid. The dried copper shell is weighed and from its mass and the initial mass of the sample the percent copper can thus be calculated: percent Cu = mass of Cu x 100 mass of penny Purpose: The purpose of this lab will be to determine the percentage of the ...read more.

Middle

mass Mass of beaker Mass of Cu Mass of Zn % of Cu % of Zn HCl H2SO4 H3PO4 3 M Trial 1 Original mass Mass of beaker Mass of Cu Mass of Zn % of Cu % of Zn HCl H2SO4 H3PO4 Trial 2 Original mass Mass of beaker Mass of Cu Mass of Zn % of Cu % of Zn HCl H2SO4 H3PO4 6 M Trial 1 Original mass Mass of beaker Mass of Cu Mass of Zn % of Cu % of Zn HCl H2SO4 H3PO4 Trial 2 Original mass Mass of beaker Mass of Cu Mass of Zn % of Cu % of Zn HCl H2SO4 H3PO4 SO4: 1 M Trial 1 Original mass Mass of beaker Mass of Cu Mass of Zn % of Cu % of Zn HCl H2SO4 H3PO4 Trial 2 Original mass Mass of beaker Mass of Cu Mass of Zn % of Cu % of Zn HCl H2SO4 H3PO4 3 M Trial 1 Original mass Mass of beaker Mass of Cu Mass of Zn % of Cu % of Zn HCl H2SO4 H3PO4 Trial ...read more.

Conclusion

penny = mass of Zn x 100 mass of penny E Calculations: Zns + 2HClaq --> ZnCl2aq + H2g Zn --> 2e- + Zn2+ 0.76 volts 2H+ + 2e- --> H2 0.00 volts 0.76 volts spontaneous in HCl Cu + 2H+ --> H2 + Cu2+ Cu --> Cu2+ + 2e- -0.34 volts 2H+ + 2e- --> H2 0.00 volts -0.34 volts not spontaneous in HCl 3Cu + 8H+ + 2NO3- --> 3Cu2+ + 2NO + 4H2O NO3- + 4H+ + 3e- --> NO + 2H2O 0.96 volts Cu --> Cu2+ + 2e- -0.34 volts 0.62 volts spontaneous in HNO3 3Zn + 8H+ + 2NO3- --> 3Zn2+ + 2NO + 4H2O NO3- + 4H+ + 3e- --> NO + 2H2O 0.96 volts Zn --> Zn2+ + 2e- 0.76 volts 1.72 volts spontaneous in HNO3 Cu + 2H+ --> H2 + Cu2+ Cu --> Cu2+ + 2e- -0.34 volts 2H+ + 2e- --> H2 0.00 volts - 0.34 volts not spontaneous in H2SO4 Zn + 2H+ --> Zn2+ + H2 Zn --> 2e- + Zn2+ 0.76 volts 2H+ + 2e- --> H2 0.00 volts 0. ...read more.

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