Strength of Acids and Bases


 
 
Concept Explanation
 

Strength of Acids and Bases

Strength of Acids

: As we know ,an acid is a substance which in aqueous solution  dissociates to produce hydrogen ions .

The strength of an acid depends on the concentration of hydrogen ions which dissociates in water. Greater the number of hydrogen ions dissociates greater is the strength of an acid. On this basis acids can be classified as:

Strong Acids :

It is an acid that dissociates completely or almost completely in water.For eg:

                       large HCl(aq)leftrightharpoons H^+(aq)+Cl^-(aq) 

              Hydrochloric acid            Hydrogen ion       Chloride ion

                    large H_2SO_4(aq)leftrightharpoons 2H^+(aq)+SO_4^2^-(aq)

                   Sulphuric acid                  Hydrogen ion         Sulphate ion     

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Sample Questions
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Question : 1

Odd one among the following with respect to the strength of acids is ____________________

Right Option : C
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Question : 2

Which of the following are correct :

(a) If pH >7 , Indicates that the given solution is basic.

(b) If pH<7 , Indicates that the solution is acidic.

(c) If pH=7 , indicates that the solution is neutral.

Right Option : D
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Explanation
Question : 3

A solution 'A' has pH value zero. The solution is ___________________

Right Option : B
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Explanation
 
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