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CBSE Class 10 Answered

Is there any easy method to identify strong acid, weak acid,strong base, weak base?
Asked by Manoj | 14 Mar, 2013, 08:46: AM
Expert Answer
pH is a measure of the concentration of hydrogen ions in a solution. Strong acids like hydrochloric acid at the sort of concentrations you normally use in the lab have a pH around 0 to 1. The lower the pH, the higher the concentration of hydrogen ions in the solution.
The greater the value of Ka (dissociation constant), the more the formation of H+ is favored, and the lower the pH of the solution. Similarly, lower the value of Ka (dissociation constant), less the formation of H+ is favored and higher the pH of solution.
 
Stronger acids have a larger Ka and a more negative pKa than weaker acids.
 
Strong acids are: H2SO4, H3PO4 , HCl, HNO3 etc.

Strong bases are : NaOH, KOH, LiOH etc

If pH is between 0 - 2 solution is a strong acid
If pH is between 12 - 14 solution is a strong base
 
Answered by | 14 Mar, 2013, 10:22: AM
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