Verified Solution • 2025–26 Session moderate

QAIPMT-2008-Ch-2233: NEET 2008 Chemistry - Class 11 AIPMT-2008-Ch-2233 Solution: Equal volumes of three acid solutions of pH 3, 4 and 5 are…

Equal volumes of three acid solutions of pH 3, 4 and 5 are mixed in a vessel. What will be the H+H^+ ion concentration in the mixture?

Multiple Choice Options

  • A 3.7×10−3 M3.7\times10^{-3}\ \text{M}
  • B 1.11×10−3 M1.11\times10^{-3}\ \text{M}
  • C 1.11×10−4 M1.11\times10^{-4}\ \text{M}
  • D 3.7×10−4 M3.7\times10^{-4}\ \text{M}

Step-by-Step Verified Solution

We know, pH = � log[H + ] For pH = 3, 3 = � log [H + ] _ [H + ] = 10 �3 M For pH = 4 , 4 = � log [H + ] _ [H + ] = 10 �4 M For pH = 5, 5 = � log [H + ] _ [H + ] = 10 �5 M Total concentration of [H + ] M = 10 _ 3 ( 1 + 0.1 + 0.01 ) 3 M(V 1 +V 2 + V 3 ) = M 1 V 1 + M 2 V 2 + M 3 V 3 As V 1 = V 2 = V 3 = V _ M(3V) = (M 1 + M 2 + M 3 )V _ 3M = (10 �3 + 10 �4 + 10 �5 ) = 1.11 _ 10 _ 3 3 = 3.7 _ 10 _ 4 M

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