Q28 / 170 · Manipal (MET) 2018 · Chemistry

To a 4 L of 0.2 M solution of NaOH 2 L of 0.5 M NaOH are added. The molarity of resulting solution is

  • A
    0.9 M
  • Correct answer
    B
    0.3 M
  • C
    1.8 M
  • D
    0.18 M

Solution

$\begin{aligned} & \text {Total moles of } \mathrm{NaOH}=4 \times 0.2+2 \times 0.5 \\ & \\ & =0.8+1.0=1.8 \\ & \begin{aligned} \text { Total volume } & =4+2=6 \mathrm{~L} \\ \therefore \text { Molarity } & =\frac{1.8}{6} \\ & =0.3 \mathrm{M}\end{aligned}\end{aligned}$

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

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