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40 ml of 0.5 M K Br and 60 ml 1 M K Br ...

`40 ml` of `0.5 M K Br` and `60 ml 1 M K Br` are mixed. The solution is then heated to evaporate water until the total volume is `20 ml`. What is the final molarity of `K Br`:

A

`1 M`

B

`3 M`

C

4 M

D

2 M

Text Solution

Verified by Experts

The correct Answer is:
C
`[K Br]_("final") = (n_(K Br))/(V_("final")) = (M_(1)V_(1) + M_(2)V_(2))/(V_("final")) = (0.5 xx 40 + 1 xx 60)/(20)`
`= (80)/(20) = 4M`
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