Question

2.5 litre of `1M NaOH` solution is mixed with another 3 litre solution of `0.5M NaOH` solution. Then the molarity of the resulting solution is
A. `0.80M`
B. `1.0M`
C. `0.73M`
D. `0.50M`

Answer 1

Correct Answer - C
`V_(1)M_(1) + V_(2)M_(2) = V_(3) xx M_(3)`
`(2.5 xx 1 +3 xx 0.5) = M_(3) xx 5.5`
`:. 2.5 +1.5 = M_(3) xx 5.5`
or `M_(3) = (4)/(5.5) = 0.73 M`