Răspuns:
Explicație:
a)
100 g suc lamaie ....................6,5 g acid citric
60 g suc ...................................m = 60*6,5/100 = 3.9 g acid citric
masa solutiei = 60 + 140 = 200 g
c = 3,9*100/200 = 1,95%
b)
100 g suc lamaie ....................6,5 g acid citric
300 g suc lamaie .................. m = 300*6,5/100 = 19,5 g acid citric
100 g solutie 2%........................2 g acid citric
M ...................................................19,5 g acid citric
M = 100*19,5/2 = 975 g solutie
975 - 300 = 675 g apa trebuie adaugata