Question

In: Chemistry

For each pair of cations, circle the one that is more acidic. (a) Na+ or NH4+...

For each pair of cations, circle the one that is more acidic.

(a) Na+ or NH4+

(b) Fe2+ or Fe3+

(c) Ga3+ or Al3+

Provide an explanation please.

Expert Solution

First, let us define "acidity"

acidity = will have a pH < 7; this can be either due to decrease in OH- concentration or increase of H+ concentration

(a) Na+ or NH4+

Na+ + H2O = no hydrolysis, pH = 7 approx

NH4+ + H2O = NH3 + H3O,. this is acidic , pH < 7

NH4+ is more acidic

(b) Fe2+ or Fe3+

Fe2+ + 2H2O = Fe(OH)2 + 2H+

Fe+3 + 3H2O = Fe(OH)3 + 3H+

Clearly Fe3+ is more acidic

(c) Ga3+ or Al3+

Least soluble is given by lowest Ksp:

Ga(OH)3 7.28×10–36

Al(OH)3 4.6×10–33

then, Ga(OH) is Less soluble, therefore, will form MORE precipitate

then, this is more acidic, since it leaves more H+ in solution

queen_honey_blossom answered 2 years ago

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