2.5 litre of 1 M NaOH solution are mixed with another 3 litre of 0.5 M NaOH solution Then the molarity of the resulting

Options

A. 0.80 M
B. 0.1 M
C. 0.73 M
D. 0.50 M

Answer

C

Explanation

`M_(1)V_(1) + M_(2)V_(2) = M_(3)V_(3)`
`1 xx 2.5 + 0.5 xx 3 = M_(3) xx 5.5` (Total solution = 5.5 L)
` 2.5 + 1.5 = M_(3) xx 5.5`
`therefore " " M_(3) = (4)/(5.5) = 0.73 M`