Question

Care va fi concentratia solutiei obtinuta prin amestecarea a 2 solutii .Prima 20g de solutie cu concentratie 10% . A doua 40 g solutie cu concentratie 20%

Answer 1

c=100md/ms

c1=10%
ms1=20g
=>md1=20x10/100=2g

c2=20%
ms2=40g
=>md2=40x20/100=8g

c3=100md3/ms3
md3=md1+md2=2+8=10g
ms3=ms1+ms2=20+40=60g
=>c3=100x10/60=16.66%

Answer 2

c = md*100/ms
md1 = 20*10/100 = 2 g
md2 = 40*20/100 = 8 g
md3 = 2+8 = 10 g
ms3 = 20+40 = 60 g soluție
c3 = 10/60*100 = 16,66%