Question

2.5 litre of 1M NaOH solution is mixed with a 3.0 litres of 0.5 M NaOH solution. The molarity of the resulting solution is :
A. 0.80 M
B. 1.0 M
C. 0.73 M
D. 0.50 M.

Answer 1

Correct Answer - c
`M_(1)V_(1)+M_(2)V_(2)=M_(3)(V_(1)+V_(2))`
`M_(3)=(M_(1)V_(1)+M_(2)V_(2))/((V_(1)+V_(2)))`
`M_(3)=(1xx2.5+0.5xx3)/(2.5+3)`
`(4.0)/(5.5)=0.73M`