Question

A2.5 L sample of a solution of sea water has a NaCl concentration of 5.4

M. What is the new concentration of this solution if it is boiled down to a
volume of 1.0 L?

Answer 1

13.5 is the new concentration of this solution if it is boiled down to a

volume of 1.0 L.

Step-by-step explanation:

Data given:

Initial volume of the solution of sea water = 2.5 litre

Molarity of NaCl solution M1 = 5.4 M

fInal volume = 1 litre

final molarity = ?

Assuming that no loss of NaCl from sea water took place when the sea water was boiled.

applying the formula for change in concentration as:

Minitial V initial = Mfinal X Vfinal

M final =
`(M initial X V initial)/(V final)`

Putting the values in the equation:

Mfinal =
`(5.4 X 2.5)/(1)`

M final = 13.5 M

thus it can be concluded that molarity will increase drastically when volume gets reduced from 2.5 litre to 1 litre. The solution becomes highly concentrated as water volume decreases due to evaporation.