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To a 4 L of 0.2 M solution of NaOH, 2L o...

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

A

0.9 M

B

0.3 M

C

1.8 M

D

0.18 M

Text Solution

Verified by Experts

The correct Answer is:
B

Moles of NaOH in 4 L of 0.2 M `=0.2xx4=0.8`
Moles of NaOH in 2L of 0.5 M `=0.5xx2=1.0`
Total moles `=1.0+0.8=1.8`,
Total volume `=4+2=6L`
`:.` Molarity `=(1.8)/(6)=0.3` M.
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