Question

What is the consecration of a solution that is made by diluting 50.0 mL of a 40.0 M NaCl solution to a final volume of 1000.0 mL?

Answer 1

2M

Explanation:

Given that:

V1 = 50mL

M1 = 40M

V2 = 1000mL

unknown:

M2 = ?

Solution:

Concentration is the number of moles solute in a solution.

Since the number of moles in the solute remains the same;

   Concentration = $\frac{number of moles}{volume}$

number of moles = concentration x volume

 Number of moles before and after the dilution remains the same;

         M1 x V1 = M2 x V2

M1 is initial concentration

V1 is initial volume

M2 is final concentration

V2 is final volume

      40 x 50  = M2 x 1000

            M2 = 2M

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