Question

Which compound will precipitate when solutions of iron(II) acetate, Fe(C2H3O2)2, and potassium iodide (KI) are mixed?

A.
Fe(C2H3O2)2
B.
FeI2
C.
KCH3CO2
D.
none

Answer 1

The equation for the reaction is;

$Fe(C_2H_3O_2)_2+KI\to K(C_2H_3O_2)_2+FeI_2$

$K,$ a group $1$ element dissociates completely hence $KCH_3CO_2$ becomes $K^+$ and $CH_3CO_2^-$

$Fe^{2+}$ and $I^-$ do not dissociate in water hence Iron (II) iodide$(FeI_2)$ is the precipitate.

The correct answer is $B(FeI_2)$