149 & 150. A 0.100 M KCl solution is placed in contact with a 0.100 M LiCl solut

Question

149 & 150. A 0.100 M KCl solution is placed in contact with a 0.100 M LiCl solution. Which of the following is true for junction between the two solutions? I The KCl side of the junction will be positive as Cl diffuses faster across the junction than K+. II The LiCl side of the junction will be negative as Li+ diffuses faster across the junction than K+. III The KCl side of the junction will be positive as K+ diffuses slower across the junction than Li+ IV The LiCl side of the junction will be more negative as Li+ diffuses faster across the junction than Cl. A) I and III B) II and IV C) I and II D) III and IV E) II and III

Explanation / Answer

Li+ has greater mobility than K+. The LiCI side of the LiCI | KCI junction will be negative because Li+ diffuses into the KCI region faster than K+ diffuses into the LiCI region. K+ has a greater mobility than Li+, so this junction has the opposite sign. The LiCI | KCI voltage is ergo larger, because the difference in mobility between Li+ and K+ is greater than the difference in mobility between K+ and Na+.

With this said, we can say that statement II is correct and statement III is also correct, so option E is the correct option.

Hope this helps.

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