Question

Standard electrode potential values, `E^(@)` at `Al^(3+)//Al` is `-1.66 V` and that of `Tl^(3+)//Tl` is `+1.26 V`. Predict about the formation of `M^(3+)` ions in solution and compare the electropositive character of the two metals.

Answer 1

The negative valueof `E^(@)` for `Al^(3+)//Al` suggests that Al has a strong tendency to form `Al^(3+)` (aq) ions. On the other hand, the positive value of `E^(@)` for `Tl^(3+)//Tl` suggests that Tl does not have high tendency to form `Tl^(3+)` ions. Since Al can form `Al^(3+)` ions more easily than `Tl` does to form `Tl^(3+)` ions, therefore Al is more electronegativity than Tl.