Question

Se amesteca 100g solutie 10% acid azotic cu 300g solutie 15% acid azotic. Determina prin calcul concentratia procentuala a solutiei rezultate.

Answer 1

c=md/md*100 rezulta 10=md1/100*100= 10*100/100=10 g acid azotic pur
                                 15=md2/300*100=15*300/100=15 g acid azotic pur
solutia finala
mdf=md1+md2=10+15=25 g
msf=ms1+ms2=100+300=400 g
Cf=mdf/msf*100=25*100/400=2500/400=6,25%