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Tin metal can be obtained by the reduction of tin ions (Sn2+) by Co2+ at 298...

Tin metal can be obtained by the reduction of tin ions (Sn2+) by Co2+ at 298 K: Sn2+ (aq) + Co2+(aq) <--> Sn (s) + Co4+ (aq) , Kc = 1.70

150 mL of 0.200 M Sn(NO3)2 is mixed with 150 mL of 0.250 M Co(NO3)2 at 298 K. What is the concentration of Co4+ at equilibrium? SHOW ALL WORK.

Solutions

Expert Solution

concentration of Sn+2 = 150 x 0.2 / 150 + 150 = 0.1 M

concentration of Co+2 = 150 x 0.250 / 150 + 150 = 0.125 M

Sn2+ (aq) + Co2+(aq) <----------> Sn (s) + Co4+ (aq)

0.1               0.125                                          0

0.1 - x           0.125 - x                                     x

Kc = x / (0.1 - x )(0.125 - x)

1.70 = x / x^2 - 0.225 x + 0.0125

x = 0.0157

concentration of Co4+ at equilibrium = 0.0157 M

queen_honey_blossom answered 2 years ago
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