Question

Se amesteca o solutie cu masa de 350 grame si concentratie de 40% cu o solutie cu masa 780 grame si concentratie 53% . Aflati concentratia finala.

Answer 1

C final = Md final / ms final  x100 
Md final = md1 +md2
ms final=ms1+ ms2 
C1= md1/ms1 x100 => md1= c1xms1/100  = 40x350/100=140g
c2= md2/ms2 x 100 => md2= c2xms2/100 = 53.720/100=381,6 g 
md final = 140g+381,6g= 521,6 g 
ms final= 350+720= 1070
c final = 521,6/1070x100 = 48,74% 

Answer 2

md1=c1*ms1/100=40*350/100=140 g 
md2 =c2*ms2/100=53*780/100=413.4 g
md final = 140+413,4=553,4 g
ms final = 350+780=1130 g
c%f=553,4/1130*100=48,97%