#20.7 Avoltaic cell is constructed using the reaction of chromium metal and iron

Question

#20.7 Avoltaic cell is constructed using the reaction of chromium metal and iron(II) ions. Complete the following sentences: Electrons in the external circuit fow to the electrode. Negative ions move in the from the half cell. The salt bridge from the half cell to the halfreaction at the anode is and that at the cathode is #20.13 calculate the value of for each of the following reactions. Decide whether each is product-favored the direction written. a) 21 (aq) Zn? (aq)- liz (s) Zn(s) c) 2Cl(aq) Cuz (aq) Cu(s) Cl2(g) d) Fe2 (aq) Ag (aq)- Fe' (aq) Ag(s) #20.17 Consider the following half-reactions Half-reaction E (V +0.34 Sn2 (ag) 2e Sn(s) 0.14 -0.44 -0.76

Explanation / Answer

Answer:-

a). Based on the Eo value Al(s) metal is the mosteasily oxidized.

b). Zn and Al metals are capable of reducing Fe2+ to Fe(s) because both Zn and Al have more negative reduction potential than that of Fe

c). Fe2+(aq) + Sn(s) ----------> Sn2+(aq) + Fe(s) Eo = - 0.30 V

The reaction is reactant favoured because the Eo of the reaction is negative.

d). Zn2+(aq) + Sn(s) ------------> Sn2+(aq) + Zn(s) Eo = - 1.52 V

It is also reactant favoured reaction.

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