Which ion pair would result in the smallest junction potential when used in a salt bridge: Na⁺/Cl^-, K⁺/Cl^-, or Li⁺/Br^-? Justify your choice.

• A. Na⁺/Cl^- because they are commonly used in salt bridges.
• B. K⁺/Cl^- because they have similar mobility values, minimizing potential differences.
• C. Li⁺/Br^- because they have the largest size difference.
• D. Na⁺/Cl^- because they are both small ions.

Answer: (B)