Question

Some amount of water is evaporated from a 2.0 L, 0.2 M NaI solution, to from a 1.0 L solution. The molar mass of NaI is 150 g/mol. What is the final concentration of NaI solution ?

Answer 1

Answer: 0.4M

Explanation: C1V1= C2V2

C1 = 0.2M

V1 =2L

C2=?

V2= 1

C1V1= C2V

0.2 x 2 = C2 x 1

C2 = 0.4M