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

What is the pH of the resulting solution when equal volumes of 0.1 M NaOH and 0.01 M HCl are mixed?
  1. 12.65
  2. 2.0
  3. 7.0
  4. 1.04

Solution

N1V1-N2V2=N.V.
0.1×1-0.01×1=N×2
OH-=Nnet=0.092=0.045 N
pOH=-log 0.045=1.35
∴pH=14-pOH=14-1.35=12.65

Asked in: NEET 2015 (Phase 2)

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