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Solution: Predict whether the following reactions would

Chapter 18, Problem 18.16

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QUESTION:

Predict whether the following reactions would occur spontaneously in aqueous solution at 25C. Assume that the initial concentrations of dissolved species are all 1.0 M. (a) Ca(s) 1 Cd21(aq) Ca21(aq) 1 Cd(s) (b) 2Br2(aq) 1 Sn21(aq) Br2(l) 1 Sn(s) (c) 2Ag(s) 1 Ni21(aq) 2Ag1(aq) 1 Ni(s) (d) Cu1(aq) 1 Fe31(aq) Cu21(aq) 1 Fe21(aq)

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QUESTION:

Predict whether the following reactions would occur spontaneously in aqueous solution at 25C. Assume that the initial concentrations of dissolved species are all 1.0 M. (a) Ca(s) 1 Cd21(aq) Ca21(aq) 1 Cd(s) (b) 2Br2(aq) 1 Sn21(aq) Br2(l) 1 Sn(s) (c) 2Ag(s) 1 Ni21(aq) 2Ag1(aq) 1 Ni(s) (d) Cu1(aq) 1 Fe31(aq) Cu21(aq) 1 Fe21(aq)

ANSWER:

Step 1 of 3

The standard cell potential and Gibb’s free energy of a reaction are related as

                                                             

If the standard cell potential is positive, then the sign of delta G will be negative, and the reaction becomes spontaneous.

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