a)
100 g suc lamaie .........6,5 g acid citric
60 g suc ......... m = 60 · = 3.9 g acid citric
masa solutiei = 60 + 140 = 200 g
c = 3,9 · = 1,95%
b)
100 g suc lamaie ....................6,5 g acid citric
300 g suc lamaie .................. m = 300· \frac{6,5}{100} = 19,5 g acid citric
100 g solutie 2%........................2 g acid citric
M ..................19,5 g acid citric
M = 100 · = 975 g solutie
975 - 300 = 675 g apa