@@ asked in 科學化學 · 2 decades ago

鋅銅電池的實驗步驟...急需(20 點)

請問一下有關鋅銅電池詳細ㄉ實驗步驟......謝謝 !!

請問一下有關鋅銅電池詳細ㄉ實驗步驟......謝謝 !!

請問一下有關鋅銅電池詳細ㄉ實驗步驟......謝謝 !!

請問一下有關鋅銅電池詳細ㄉ實驗步驟......謝謝 !!

3 Answers

Rating
  • Anonymous
    2 decades ago
    Favorite Answer

    There are two kinds of zinc/copper couples

    1. Simple cell

    Dip the two metals in copper (II) sulphate solution(or other electrolyte).

    Use a connecting wire to connect the two metals .

    As Zinc is higher than Copper in the electrochemical series, zinc loses electrons

    more readily than copper and electrons will flow from zinc to copper through the

    external circuit.

    Ionic half equation(Use Copper (II) sulphate as electrolyte:

    at zinc electrode: Zn→Zn2+ + 2e

    at copper electrode: Cu2+ +2e →Cu(because Cu2+ lower than H+ in electrolyte)

    Disadvantage: When zinc is dipped into copper (II) sulphate solution, there is direct

    electrons transfer from zinc to copper ions in the electrolyte.

    As a result, zinc dissolves rapidly and fewer electrons will flow

    through the external circuit.

    2.Simple cell with salt bridge

    As mensioned by the person above.

    Advantage: No displacement reaction occurs.

    Disadvantage: Electrolyte soaked in salt bridge may dry out.

    Pay attention: The electrolyte soaked in salt bridge should have no reaction with the

    solution in the two half cells.

    Source(s): My brain
  • 1 decade ago

    三個都有回答到阿

  • 2 decades ago

    兩個燒杯,中間以鹽橋連接。一個燒杯中裝硫酸鋅,以鋅片為電極;另一個燒杯中裝硫酸銅,以銅片為電極;鹽橋中裝强電解質(飽和溶液),如硝酸鉀。再以一銅絲(電線)連接兩電極,即可通電。註:鋅氧化成鋅離子;銅離子還原成銅。

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