Answer:
1) Fe³⁺
2) Al³⁺
3) Pb²⁺
Explanation:
Because all of the metal ion concentrations are the same, the order that they precipitate will be dependent on the
values of each individual precipitate. The lower the
, the less OH⁻ needed in solution to precipitate.
The three
values are
= 2.6 x 10⁻³⁹ for Fe(OH)₃,
= 1.9 x 10⁻³³ for Al(OH)₃
= 1.4 x 10⁻¹⁵ for Pb(OH)₂
This means that the ions will precipitate in the following order Fe³⁺ then Al³⁺ then Pb²⁺
Note: if too much OH⁻ is added Al³⁺ will redissolve into solution because of the formation of the soluble complex Al(OH)⁻₄ (
= 1.1 x 10³³)
The kingdom that we are 9is in this is my favorite 9
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