## Net Ionic Equation examples

Consider the reaction of 50.0 mL of 0.25 M hydrochloric acid with 25.0 mL of 0.50 M sodium hydroxide.

• First write a net ionic equation for this reaction.

• After the reaction is completed, what will be left over?

1. Acid?
2. Base?
3. Neither?

How much water was made (synthesized)?

## Oxidation/Reduction Reaction examples

• A piece of clean copper is placed in a solution of silver nitrate. Assuming the copper goes to Cu(II) write a balanced equation. Notice that in this case you must balance the charge in order to get the final equation.
• First need to write out the reactant ions.
• silver nitrate = AgNO3
• What is the charge on nitrate ion?

• What is the charge of the silver ion?

• What is the charge of copper?

• Next figure out charge on product ions
• What is the charge on Copper ion?

• What is the charge on silver?

• Now write balanced equation.

+

 As another example we can look at a key oxidation reaction in glycolysis, the central pathway of metabolism. Don't worry about these reactions - they will not be on an exam. They are presented for your interest. In this case we use a biological oxidizing agent, NAD+ to take electrons (in the form of a hydride ion, H:-) Frequently organisms need to operate this reaction under anaerobic (oxygen free) conditions. For example the maximum power (energy/sec) you can get from your muscles is anaerobically. For this to occur you need to regenerate the oxidizer (NAD+) without the presence of oxygen. For this to occur we use another reaction: The mechanism for this electron transfer is shown below: