Determine what redox reaction, if any, occurs (at 25degreeC) when tin metal (Sn)

Question

Determine what redox reaction, if any, occurs (at 25degreeC) when tin metal (Sn) is added to (a) a 1.0 M solution of CoCl_2 and (b) a 1.0 M solution of HCl. (a) Sn is added to a 1.0 M solution of CoCl_2 A. Sn(s) + Co^2+(aq) rightarrow Sn^2+(aq) + Co(s) B. Sn^2+(aq) + rightarrow Sn(s) + Cl_2(g) C. Co^2+(aq) + 2Cl^-(aq) rightarrow Co(s) + Cl_2(g) D. No reaction. (b) Sn is added to a 1.0 M solution of HCl A. Sn(s) + 2H^+(aq) rightarrow Sn^2+(aq) + H_2(g) B. Sn^2+(aq) + 2Cl^-(aq) rightarrow Sn(s) + Cl_2(g) C. Sn(s) + 2H_2O(l) rightarrow Sn(OH)_2(s) + H_2(g) D. No reaction.

Explanation / Answer

we know that

Eo Co+2/Co = -0.28

Eo Sn+2/Sn = -0.13

Eo Cl2 /2Cl- = 1.36

we can see that

Eo Sn+2/Sn > Eo Co+2/Co

So

Co+2 cannot oxidize Sn (s)

So reaction A is not possible

similarly

Eo Cl2/2Cl- > Eo Sn+2/Sn

so

Sn+2 cannot oxidize Cl-

so reaction B is also not possible

now

Co+2 and 2Cl- react to form CoCl2 but not Co(s) and Cl2 (g)

so

reaction C is also not possible

so

the answer is D) no reaction

2)

Eo Sn+2/Sn = -0.13

Eo Cl2 / 2Cl- = 1.36

Eo 2H+/H2 = 0

As seen in the above problem

reaction B is not possible

also

reaction C is not possible

now

Eo 2H+ / H2 > Eo Sn+2/Sn

so

2H+ can oxidize Sn (s)

Sn (s) + 2H+ ---> Sn+2 + H2

so

this reaction is possible

so

the answer is A) Sn (s) + 2H+ (aq) ---> Sn+2 (aq) + H2 (g)

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