Subjective Type

How do you write chemical equation for the neutralization of nitric acid, $$HNO_3$$, with magnesium hydroxide, $$Mg(OH)_2$$, first with spectator ions and then without spectator ions?

Solution

First you write the "molecular" equation, then the ionic equation, and finally the net ionic equation.
You can read about these equations at
Here are the steps for you reaction.
1. Write the molecular equation
We write the equation as if all the reactants were molecules.
$$2HNO_{3}(aq)+Mg(OH)_{2}(s)\rightarrow 2H_{2}O(l)+Mg(NO_{3})_{2}(aq)$$
2. Write the ionic equation
We write all the soluble strong electrolytes as ions. $$H_{2}$$ is a weak electrolyte, so we write it as a molecule. $$Mg(OH)_{2}$$ is insoluble, so we write it as a molecule as well.
$$2H^{+}(aq)+2NO_{3}^{-}(aq)+Mg(OH)_{2}(s)\rightarrow 2H_{2}O(l)+Mg^{2+}(aq)+2NO_{3}^{-}(aq)$$
3. Write the net ionic equation
Here, we cancel all species that appear on both sides of the equation, We cancel the $$NO_{3}^{-}$$ ions.
The net ionic equation is
$$2H^{+}(aq)+Mg(OH)_{2}(s)\rightarrow 2H_{2}O(l)+Mg^{2+}(aq)$$

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