Writing a balanced ionic equation



In this lessons, we will learn how to write balanced ionic equations.

Related Topics: More Chemistry Lessons

Ionic Equations

When writing an ionic equation, state symbols of the substances must be clearly indicated. Only ionic compounds which are soluble in water (forming aqueous solution) will dissociate into ions in water. Insoluble substance cannot dissociate into ions in water.

Example:

Write the ionic equation for the word equation

Sodium chloride(aq) + silver nitrate(aq) → silver chloride(s) + sodium nitrate(aq)

Solution:

Step 1: Write the equation and balance it if necessary

NaCl(aq) + AgNO3(aq) → AgCl(s) + NaNO3(aq)

Step 2: Split the ions. (Only compounds that are aqueous are split into ions.)

Na+(aq) + Cl-(aq) + Ag+(aq) + NO3-(aq) → AgCl(s) + Na+(aq) + NO3-

Step 3: Cancel out spectator ions. (Spectator ions are ions that remain the same in their original states before and after a chemical reaction.)


Step 4: Write a balanced ionic equation

Ag+(aq) + Cl-(aq) → AgCl(s)


Example:

Write the ionic equation for the word equation

Sodium(s) + hydrochloric acid(aq) -> sodium chloride(aq) + hydrogen(g)

Solution:

Step 1: Write the equation and balance it.

2Na(s) + 2HCl(aq) -> 2NaCl(aq) + H2(g)

Step 2: Split the ions. (Only compounds that are aqueous are split into ions.)

2Na(s) + 2H+(aq) + 2Cl-(aq) → 2Na+(aq) + 2Cl-(aq) + H2(g)

Step 3: Cancel out spectator ions. (Spectator ions are ions that remain the same in their original states before and after a chemical reaction.)


Step 4: Write a balanced ionic equation

2Na(s) + 2H+(aq) → 2Na+(aq) + H2(g)


The following video shows an example of writing an ionic equation.
Zinc + Hydrogen Chloride → Zinc Chloride + Hydrogen



Write a complete, total ionic and net ionic equations for the reaction of aqueous sodium carbonate with aqueous barium nitrate.





Molecular, Complete Ionic, and Net Ionic Equations
How to write a net ionic equation. (double replacement)
Basic lesson on molecular equations, complete ionic equations, and net ionic equations. All of them are technically correct, but each one is meant to show a different thing.
AgNO3 + NaBr → AgBr + NaNO3
HCl + KOH → H2O + KCl



This video works through several examples of net ionic equations.
The examples worked are these:
Ca(NO3)2 + KF (Calcium Nitrate + Potassium Fluoride)
BaCl2 + H2SO4 (Barium Chloride + Sulfuric Acid)
KOH + HC2H3O2 (Potassium Hydroxide + Acetic Acid)
Sr(C2H3O2)2 + Li2S (Strontium Acetate  + Lithium Sulfide)
Ca(OH)2 + Na3PO4 (Calcium Hydroxide + Trisodium Phosphate)





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