In order to do this correctly, you must have a concentration of the acid in the solution because the concentration will affect the percent ionization. I would guess that you could
http://answers.yahoo.com/question/index?qid=201310...

The original amount and the present amount. What is the difference? Then use amount of increase equals original amount/ percent increase.
http://answers.ask.com/Society/Family/how_to_calcu...

1. Use the calculator to divide the numerator (top number) of the first fraction by the denominator (bottom number) of the first fraction. Write this decimal number down. 2. Divide
http://www.ehow.com/how_4704551_calculatepercenta...
