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  4. 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

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Q. 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

ManipalManipal 2018

Solution:

Total moles of $NaOH =4 \times 0.2+2 \times 0.5=0.8+1.0=1.8$
Total volume $=4+2=6 L$
$\therefore $ Molarity $=\frac{1.8}{6}=0.3 \,M$