Question

Give the net ionic equation for the reaction (if any) that occurs when aqueous solutions of K2S and Fe(NO3)2 are mixed

Answer 1

Answer

$S^{2-}(aq)+Fe^{2+}(aq)\operatorname{\rightarrow}FeS(s)$

Explanation

The reaction is a double displacement reaction.

Step 1: Write the balanced molecular equation with the state of the substances as shown below:

$K_2S(aq)+Fe(NO_3)_2(aq)\rightarrow2KNO_3(aq)+FeS(s)$

Step 2: Split the substances into ions (ionic equations):

$2K^++S^{2-}+Fe^{2+}+2NO_3^-\operatorname{\rightarrow}2K^++2NO_3^-+FeS$

Step 3: Cancel out the spectators on both sides of the complete ionic equation in step 2.

$S^{2-}+Fe^{2+}\operatorname{\rightarrow}FeS$

Step 4: Write the remaining substances as the net ionic equation.

$S^{2-}(aq)+Fe^{2+}(aq)\operatorname{\rightarrow}FeS(s)$