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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