Q24 / 180 · KCET 2012 · Chemistry

$5 \mathrm{~mL}$ of $0.4 \mathrm{~N} \mathrm{NaOH}$ is mixed with $20 \mathrm{~mL}$ of $0.1 \mathrm{~N} \mathrm{HCl}$. The $\mathrm{pH}$ of the resulting solution will be

  • Correct answer
    A
    7
  • B
    8
  • C
    5
  • D
    6

Solution

From the first law of thermodynamics, the total energy of the universe remains constant. $$ \begin{aligned} &\text { Milliequivalents of } \mathrm{NaOH}=\mathrm{N}_{1} \mathrm{~V}_{1} \\ &\qquad=0.4 \times 5=0.20 \\ &\text { Milliequivalents of } \mathrm{HCl}=\mathrm{N}_{2} \mathrm{~V}_{2} \\ &\qquad=0.1 \times 20=0.20 \end{aligned} $$

Hence, the correct answer is option: 'A'.

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