Question

If I leave 750 mL of 0.75 M sodium chloride solution uncovered on a windowsill and 150 mL of the solvent evaporates, what will the new concentration of the sodium chloride solution be? M1V1 = M2V2

Answer 1

M1V1=M2V2

V2=750-150=600 ml

0.75M*750 ml = M2*600

M2=0.75*750/600 ≈ 9.38 M

Answer 2

The new concentration of the sodium chloride solution will be 9.38 M.

Charles' law

By Charles law

The volume of the gas is directly proportional to the temperature when the pressure is constant.

The volume

V2 = 750 - 150 = 600

Now, by the equation of Charles law:

M1V1=M2V2

$\bold{0.75\;M\times750\; ml = M2\times600}$

$\bold{M2= \dfrac{0.75\times750}{600 } = 9.38\; M}$

Thus, the concentration is 9.38 M.

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