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Draw a well labeled diagram of the electrochemical cell when copper and magnesium half cells are connected.

Chemistry

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Step-by-step solution

4 steps

Haya hapa majibu kwa maswali yako:

Part a· 4 steps

Indicate in the table with a tick (✓) where a reaction occurs and a cross (x) where no reaction occurs.

Ili kubaini kama mmenyuko utatokea, tunalinganisha uwezo wa kupunguza wa kawaida (Eθ\text{E}^\theta) wa metali na ioni ya chuma. Metali itaitikia na ioni ya chuma ikiwa metali hiyo ina uwezo wa kupunguza hasi zaidi (au ni wakala wa kupunguza wenye nguvu zaidi) kuliko chuma kinachoundwa kutoka kwa ioni.

Uwezo wa kupunguza wa kawaida uliotolewa:
Zn2+(aq)+2e−⟶Zn(s)\text{Zn}^{2+}(\text{aq}) + 2\text{e}^- \longrightarrow \text{Zn(s)}, Eθ=−0.76V\text{E}^\theta = -0.76\text{V}
Pb2+(aq)+2e−⟶Pb(s)\text{Pb}^{2+}(\text{aq}) + 2\text{e}^- \longrightarrow \text{Pb(s)}, Eθ=−0.13V\text{E}^\theta = -0.13\text{V}
Cu2+(aq)+2e−⟶Cu(s)\text{Cu}^{2+}(\text{aq}) + 2\text{e}^- \longrightarrow \text{Cu(s)}, Eθ=+0.34V\text{E}^\theta = +0.34\text{V}
Ag+(aq)+e−⟶Ag(s)\text{Ag}^{+}(\text{aq}) + \text{e}^- \longrightarrow \text{Ag(s)}, Eθ=+0.80V\text{E}^\theta = +0.80\text{V}

  1. Metal: Cu, Metal ion: Ag+(aq)\text{Ag}^{+}(\text{aq})

    Eθ(Cu2+/Cu)=+0.34V\text{E}^\theta(\text{Cu}^{2+}/\text{Cu}) = +0.34\text{V}
    Eθ(Ag+/Ag)=+0.80V\text{E}^\theta(\text{Ag}^{+}/\text{Ag}) = +0.80\text{V}
    Kwa kuwa Eθ(Cu2+/Cu)\text{E}^\theta(\text{Cu}^{2+}/\text{Cu}) ni hasi zaidi kuliko Eθ(Ag+/Ag)\text{E}^\theta(\text{Ag}^{+}/\text{Ag}), Cu ni wakala wa kupunguza wenye nguvu zaidi kuliko Ag. Hivyo, Cu itapunguza Ag+\text{Ag}^{+}.
    Mmenyuko: ✓

  2. Metal: Zn, Metal ion: Cu2+(aq)\text{Cu}^{2+}(\text{aq})

    Eθ(Zn2+/Zn)=−0.76V\text{E}^\theta(\text{Zn}^{2+}/\text{Zn}) = -0.76\text{V}
    Eθ(Cu2+/Cu)=+0.34V\text{E}^\theta(\text{Cu}^{2+}/\text{Cu}) = +0.34\text{V}
    Kwa kuwa Eθ(Zn2+/Zn)\text{E}^\theta(\text{Zn}^{2+}/\text{Zn}) ni hasi zaidi kuliko Eθ(Cu2+/Cu)\text{E}^\theta(\text{Cu}^{2+}/\text{Cu}), Zn ni wakala wa kupunguza wenye nguvu zaidi kuliko Cu. Hivyo, Zn itapunguza Cu2+\text{Cu}^{2+}.
    Mmenyuko: ✓

  3. Metal: Ag, Metal ion: Pb2+(aq)\text{Pb}^{2+}(\text{aq})

    Eθ(Ag+/Ag)=+0.80V\text{E}^\theta(\text{Ag}^{+}/\text{Ag}) = +0.80\text{V}
    Eθ(Pb2+/Pb)=−0.13V\text{E}^\theta(\text{Pb}^{2+}/\text{Pb}) = -0.13\text{V}
    Kwa kuwa Eθ(Ag+/Ag)\text{E}^\theta(\text{Ag}^{+}/\text{Ag}) ni chanya zaidi kuliko Eθ(Pb2+/Pb)\text{E}^\theta(\text{Pb}^{2+}/\text{Pb}), Ag ni wakala wa kupunguza dhaifu kuliko Pb. Hivyo, Ag haitapunguza Pb2+\text{Pb}^{2+}.
    Mmenyuko: x

  4. Metal: Pb, Metal ion: Zn2+(aq)\text{Zn}^{2+}(\text{aq})

    Eθ(Pb2+/Pb)=−0.13V\text{E}^\theta(\text{Pb}^{2+}/\text{Pb}) = -0.13\text{V}
    Eθ(Zn2+/Zn)=−0.76V\text{E}^\theta(\text{Zn}^{2+}/\text{Zn}) = -0.76\text{V}
    Kwa kuwa Eθ(Pb2+/Pb)\text{E}^\theta(\text{Pb}^{2+}/\text{Pb}) ni chanya zaidi kuliko Eθ(Zn2+/Zn)\text{E}^\theta(\text{Zn}^{2+}/\text{Zn}), Pb ni wakala wa kupunguza dhaifu kuliko Zn. Hivyo, Pb haitapunguza Zn2+\text{Zn}^{2+}.
    Mmenyuko: x

    Jedwali lililokamilika:

    MetalMetal ionReaction / No reaction
    CuAg+(aq)\text{Ag}^{+}(\text{aq})✓
    ZnCu2+(aq)\text{Cu}^{2+}(\text{aq})✓
    AgPb2+(aq)\text{Pb}^{2+}(\text{aq})x
    PbZn2+(aq)\text{Zn}^{2+}(\text{aq})x

Part b

Identify the strongest reducing agent.

Wakala wa kupunguza wenye nguvu zaidi ni spishi ambayo huoksidishwa kwa urahisi zaidi. Katika suala la uwezo wa kupunguza wa kawaida, spishi iliyo na uwezo wa kupunguza hasi zaidi ndiyo wakala wa kupunguza wenye nguvu zaidi.
Kutoka kwenye orodha:
Zn2+/Zn:Eθ=−0.76V\text{Zn}^{2+}/\text{Zn}: \text{E}^\theta = -0.76\text{V}
Pb2+/Pb:Eθ=−0.13V\text{Pb}^{2+}/\text{Pb}: \text{E}^\theta = -0.13\text{V}
Cu2+/Cu:Eθ=+0.34V\text{Cu}^{2+}/\text{Cu}: \text{E}^\theta = +0.34\text{V}
Ag+/Ag:Eθ=+0.80V\text{Ag}^{+}/\text{Ag}: \text{E}^\theta = +0.80\text{V}
Thamani hasi zaidi ni −0.76V-0.76\text{V}, ambayo inalingana na Zn(s)\text{Zn(s)}.
Wakala wa kupunguza wenye nguvu zaidi ni:

Zn(s)\boxed{\text{Zn(s)}}

Part c

Draw a well labeled diagram of the electrochemical cell when copper and magnesium half cells are connected.

(Kumbuka: Uwezo wa kupunguza wa kawaida kwa Mg2+/Mg\text{Mg}^{2+}/\text{Mg} ni Eθ=−2.37V\text{E}^\theta = -2.37\text{V}.)
Kwa kuwa Mg ina uwezo wa kupunguza hasi zaidi kuliko Cu (−2.37V-2.37\text{V} dhidi ya +0.34V+0.34\text{V}), Mg itakuwa anodi (oksidesheni) na Cu itakuwa katodi (upunguzaji).

Mchoro wa Seli ya Kielektroniki ya Shaba na Magnesiamu:

                                 Voltmeter
                                    |
                                    |
                                    V
        -----------------------------------------------------
       |                                                     |
       |                                                     |
       |  Anode (Mg)                                         |  Cathode (Cu)
       |  (Oxidation)                                        |  (Reduction)
       |                                                     |
       |  Mg(s) --> Mg2+(aq) + 2e-                           |  Cu2+(aq) + 2e- --> Cu(s)
       |                                                     |
       |  <--------------------------------------------------|  (Electron flow)
       |                                                     |
       |  Mg electrode                                       |  Cu electrode
       |  (in MgSO4 solution)                                |  (in CuSO4 solution)
       |                                                     |
       |  ---------------------------------------------------|
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