Determine what redox reaction, if any, occurs (at 25 degree C) when tin metal (S

Question

Determine what redox reaction, if any, occurs (at 25 degree C) when tin metal (Sn) is added to (a) a 1.0 M solution of CdCl_2 and (b) a 1.0 M solution of HC1. Sn is added to a 1.0 M solution of CdCl_2 Sn(s) + Cd^2+(aq) rightarrow Sn^2+(aq) + Cd(s) Sn^2+(aq) + 2Cl^- (aq) rightarrow Sn(s) + Cl_2 (g) Cd^2+(aq) + 2Cl^- (aq) rightarrow Cd(s) + Cl_2(g) No reaction. Sn is added to a 1.0 M solution of HCl Sn(s) + 2H^+(aq) rightarrow Sn^2+(aq) + H_2(g) Sn^2+(aq) + 2Cl^- (aq) rightarrow Sn(s) + Cl_2(g) Sn(s) + 2H_2O(l) rightarrow Sn(OH)_2(s) + H_2(g) No reaction.

Explanation / Answer

reduction potentials:

Sn--------> - 0.14 V

Cd -------> -0.40 V

Cl2 -------> 1.36

H+ -----------> 0.00 V

higher reduction potential element can act as oxidizing agent . and lower reduction potential element can act as reducing agent

a ) answer : d ) no reaction

Cd + Sn+2 --------------------> Cd+2 + Sn . this reaction only possible

b) answer : A ) Sn + 2H+ ---------------> Sn+2 + H2

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