Hi,

how much water must be evaporated from 8 grams of a 30% antiseptic solution 

to produce a 40% solution



Expressing in terms of % of water: i.e.8 grms of 70 % water..etc

Letting x represent the amount of water that must be evaporated

Question states***

  .70*8gm - x = .60(8gm-x)

       .10*8 = .40x

       .10*8/.40 = x = 2grams must be evaporated off.



CHECKING our Answer***

   5.6 -2 = 3.6 = .60*(8-2) = 3.6 

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