Question

150g de solutie de glucoza se trateaza cu reactiv fehling si se obtin 8,64 g precipitat.determina concentratia procentuala a solutiei de glucoza

Answer 1

180 g________________144 g

C6H12O6+2Cu(OH)2→C6H12O7+Cu2O+2H2O

x=?_________________8,64 g

x=8,64•180:144=10,8 g glucoză

c=md•100/ms=10,8•100:150=7,2%