MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryIonic equilibriumPrevious Year Questions

What  is  the  pH  of  the  resulting  solution  when  equal volumes of 0.1 M NaOH  and 0.01  M HCl are mixed  ? (AIPMT 2015)

A.7.0
B.1.04
C.12.65✓ Correct
D.2.0
Explanation

We  know  that,  when  equal  concentration  of  acid  and base  are  mixed,  they  get  neutralized.  But  if  the concentration  of  acid  is  greater  than  it  is  acidic. Similarly, if the concentration of base is greater than it is basic. Therefore, 1 1 2 2 M V M V =MV 0.1×1 0.01×1=M×2 M=0.09/2=0.045M Since,  the  molarity  of  NaOH  is  more,  then  the calculated pH is of alkaline nature. So the resulting pH can be found as- - [OH ]=0.045M pOH log(0.045) 1.35 pH 14 1.35 12.65 (basic). 35.      Which one of the following pairs of solution is not an acidic buffer? (AIPMT 2

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