Write a balanced net ionic equation (include physical states) for the following unbalanced...


Write a balanced net ionic equation (include physical states) for the following unbalanced reaction: {eq}\rm Fe(NO_3)_3(aq) + LiOH(aq) \to LiNO_3(aq) + Fe(OH)_3(s) {/eq}.

Double Displacement Reactions:

Double displacement reactions, otherwise known as precipitation reactions, are those in which two soluble compounds (which exist as their dissociated ions in solution) are added to each other, with one of the possible combinations of the ions grouping together into an insoluble compound and therefore precipitating out of solution.

Answer and Explanation: 1

Iron (III) nitrate and lithium hydroxide will react together with lithium displacing the iron in the nitrate salt as it is more reactive.

The general equation:

{eq}\rm Fe(NO_3)_3(aq) + 3LiOH(aq) \to 3LiNO_3(aq) + Fe(OH)_3(s) {/eq}

This can be written as the full ionic equation:

{eq}\rm Fe^{3+}(aq) + 3NO_3^-(aq) + 3Li^+(aq)+3OH^-(aq) \to 3Li^+(aq)+3NO_3^-(aq) + Fe(OH)_3(s) {/eq}

From this we can generate the net ionic equation for only those species that are changing which looks like this:

{eq}\boxed{\rm{\: Fe^{3+}(aq) + 3OH^-(aq) \to Fe(OH)_3(s)\:}} {/eq}

Iron (III) hydroxide is insoluble in water and hence it will precipitate. This is why it is left undissociated in the net ionic equation.

Learn more about this topic:

Precipitation Reactions: Predicting Precipitates and Net Ionic Equations


Chapter 10 / Lesson 9

Study precipitate reactions. Determine precipitate solubility according to solubility rules. Learn to write ionic equations by following a molecular reaction.

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