question_answer

Equal volumes of three acid solutions of pH 3, 4 and 5 are mixed in a vessel. What will be the \[{{H}^{+}}\] ion concentration in the mixture?                                                                           [AIPMT (S) 2008]

A)  \[1.11\times {{10}^{-4}}M\]    

B)  \[3.7\times {{10}^{-4}}M\]

C)  \[3.7\times {{10}^{-3}}M\]      

D)       \[1.11\times {{10}^{-3}}M\]

Correct Answer: B

Solution :

Key Idea: in mixture  of 1st acid x its volume of IInd acid  its volume  of

Assume the volume of each solution is 1 L.

in solution of pH = 3 is

in solution of pH = 4 is

in solution of pH = 5 is

Total

Note: If mixture contains both acids and bases, then concentration of mixture is given as

Concentration of mixture

cone of acids their volumes -