Question

Sa se calculeze cantitatea de apa necesara pentru a se forma: a)250 g solutie 10% b)800 g solutie 70% c)500 g solutie 40% d)700 g solutie 25% e)300 g solutie 10%

Answer 1

a)md=(250x10)/100=25g   m/apa=ms-md=250-25=200gH2O
b)md=(800x70)/100=56g   m/apa=800-56=744gH2O
c)md=(500x40)/100=200   m/apa=500-200=300gH2O
d)md=(700x25)/100=175   m/apa=700-175=525gH2O
e)md=(300x10)/100=30     m/apa=300-30=270gH2O