Tai Man asked in 科學及數學化學 · 1 decade ago

chemical cell complete circuit

請問分兩個beaker 個隻chemical cell 之間既salt bridge 係點樣complete? 請詳述其過程及用處

chemical cell中, 一方比電子, 另一方就收左d 電子, 仲complete circuit? d 電子點解可以loop 番去?

1 Answer

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  • 1 decade ago
    Best Answer

    其實要complete一個 circuit 主要係balance d charges

    而且唔一定只靠電子,electrons

    所有 mobile ions 可流動離子 都可以達到以上目的

    (雖然佢地都帶有electrons)

    而salt bridge 可以complete circuit of 2 half cells 就因為佢

    soaked with 濃縮 KCl 或其他帶有ions o既 solution

    當一個half cell (cathode 負極) 收左電子

    咁響 cathode 周圍 o既 electrolyte 電解質 就會少左cations

    例如: Cu2+(aq) + 2e- <------> Cu(s)

    咁salt bridge 入面 o既cation(K+) 就會馬上走去補充

    相反, anode 果邊d electrolyte多左cations

    例如: Zn(s) <------> Zn2+(aq) + 2e- [通過導線去左cathode]

    salt bridge 中 o既anions (Cl-) 就會走去anode 果邊

    balance d positive charges

    咁就complete 左circuit 喇

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