Question

1. a. For each set of solutions predict which one should have the lower pH. i....

1. a. For each set of solutions predict which one should have the lower pH.

i. 0.1 M Fe(ClO4)2 (aq) or 0.1 M Fe(ClO4)3 (aq)

ii. 0.1 M Ca(NO3)2 (aq) or 0.1 M Mg(NO3)2

b. Which is more Basic Towards B(CH3)3   - i. (CH3)2NH or ii. (CH3)3N. why?

Homework Answers

Answer #1

1. a. Solutions prediction of pH

i. Fe(ClO4)3 has 3 ClO4- which is a weaker conjugate base of strong acid HClO4. It would hydrolyse and give OH- in solution. On the other hand, Fe(ClO4)2 has 2 ClO4- which gives OH- in solution. Wih higher ClO4- ions to hydrolyze in case of Fe(ClO4)3, the solution would be more basic.

Thus, Fe(ClO4)3 solution would have higher pH (more basic).

ii. 0.1 M Mg(NO3)2 would have higher pH as conjugate base is more free from conjugate acid in solution. Less ion-pair.

iii. Basicity coems from the ability of bases to donate a pair of electron to an acid. alkyl groups are electron donating in nature. B(CH3)3 is a lewis acid.

So, (CH3)3N is a sronger base than (CH3)2NH.

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