n one laboratory three aqueous solutions of chlorides reacted with ammonium hydr

Question

n one laboratory three aqueous solutions of chlorides reacted with ammonium hydroxide to form the respective sodium, magnesium and iron III hydroxides. Considering the ionic radius of each involved cation (Na + 0.97, Mg2 + 0.66 and Fe3 + 0.64) what would be the result of solubility (Justify true and false responses).

For each hydroxide formed.
A) It is not possible to predict the solubility of these hydroxides from their ionic rays.
B) Soluble NaOH, Mg (OH) 2 with apparent turbidity (slow precipitation) and Fe (OH) 3 with formation
Red precipitate.
C) All hydroxides are soluble.
D) Only Fe (OH) 3 will precipitate.
E) All will precipitate, because all the hydroxides are insoluble without exception.

Explanation / Answer

A) False

Solubility increases with cationic size.because greater ionic potential of small cations, and thusthire greater attraction and strong bond with the anion.

B) True

NaOH only will soluble in water. Mg(OH)2 will not dissolve but form turbid and Fe(OH)3 will form precipitate.

C) False

Only NaOH is soluble

D) True

Mg(OH)2 is turbid in nature

E) False

NaOH will dissolve.

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