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?
  

Use your clickers to answer:

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:

© R A Paselk

Last modified 21 September 2009