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Use the Activity Series (Silberberg) to predict whether each of the following reactions will occur spontaneously...

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Chemistry

Use the Activity Series (Silberberg) to predict whether each ofthe following reactions will occur spontaneously (yes or no):
a) Mn2+ (aq) + Co (s) --> Mn (s) + Co2+(aq)
b) 3 Zn (s) + 2 Cr3+ (aq) --> 3 Zn2+ (aq)+ 2 Cr (s)
c) Ba2+ (aq) +2 Li (s) --> Ba (s) + 2 Li+(aq)
d) Hg2+ (aq) + Cd (s) --> Hg (l) + Cd2+(aq)
e) Ca (s) + 2 K+ (aq) --> Ca2+ (aq) + 2 K(s)
f) Ni2+ (aq) + Mg (s) --> Ni (s) + Mg2+(aq)

For each of these reactions, calculate the overall cell voltage,(using Append D Silberberg) and compare this quantitativeprediction with the qualitative Activity Series predictions(spontaneous or not) listed above.

Answer & Explanation Solved by verified expert
3.9 Ratings (395 Votes)
a Mn2 aq Co s Mn s Co2 aq From the activity series Mn lies above Co which means Mn is more reactive than Co and should undergo oxidation So this reaction is not spontaneous Oxidation Co s Co2 aq Eo 028 V ReductionMn2 aq Mn s Eo 118 V Eocell 028 118 09 V Since cell potential is negative it is not a spontaneous reaction b 3 Zn s 2 Cr3 aq 3 Zn2 aq 2 Cr s From the activity series Zn lies above Cr    See Answer
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