Question

1. Fe^3+(aq) + 4Cl^-(aq) ⇌ [FeCl4]^-(aq)

2. NaF(s) + H2O(l) → Na^+(aq) + F^-(aq)

3. Fe^+(aq) + 6F^-(aq) ⇌ [FeF6]^3-(aq)

Describe on the how the concentrations of Fe3+, Cl-, and [FeCl4]- changed when NaF is added (Refer

to equations provided above).

How did [Fe3+] change upon addition of NaF? _________________________________

How did [Cl-] change upon addition of NaF? _________________________________

How did [FeCl4-] change upon the addition of NaF? _____________________________

Answer 1

Solution:

From the given reaction:

Fe^3+(aq) + 4Cl- (aq) = FeCl4^- (aq)

A) When, NaF is added, then F^- ion of NaF is reacted with Fe3+, hence decreases the concentration of Fe^3+ ion and equilibrium shifted towards reactants side.

Therefore, concentration of Fe^3+ ion decreases.

B) On addition of F- ion , the concentration of Fe^3+ decreases, therefore equilibrium shifted towards reactant side, hence more Cl- is produced from FeCl4^- ions.

Therefore, concentration of Cl^- ions are increases.

C) When NaF is added, then equilibrium is shifted towards reactant side, hence the concentration of FeCl4- ion decreases.