Question

50g water is evaporated from a 300g of 10%(w/w) aqueous solution of common salt . the concentration (w/w) of the resultant solution will be​

Answer 1

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Answer 2

Answer:

20%

Concept:

• Concentration: It is the amount of solute dissolved in a solvent to form a solution
• Solvent: It is a medium which dissolves the solute molecule in to form a homogeneous solution.
• Solute: It is a substance which is going to dissolve itself into the solvent.
• Solution: A homogeneous mixture of solvent and solution.

Calculation:

Given,

weight of the solution=300 gm

weight % = 10%

so, weight of the solvent = weight of solute / weight of solution

                                          = $\frac{10}{100}$×300

                                          =30 gm

as given 50 gm of water is evaporated from the solution

so, remaining solution = 300-50

                                     = 250 gm

The concentration of the resultant solution after the evaporation will be=

w/w%= weight of the solvent/weight of the remaining solution ×100

         =( 50/250)×100%

         = 20%

the concentration (w/w) of the resultant solution will be​ of 20%.

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