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?
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:
© R A Paselk
Last modified 21 September 2009