Question

amestecam 400g solutie de zahar de concentratie 20% cu 200g solutie de concentrartie 5%.Ce concentratie detinem

Answer 1

sol 1 :
ms = 400 g
c = 20 %
=> md1 = 80 g
sol 2:
ms = 200 g
c = 5 %
=> md2 = 10 g
c finala = (md1 + md1 / ms1 + ms2) * 100 = (80 + 10 / 400 + 200) * 100 = (90 / 600 ) * 100 = 3/20 * 100 = 300/20 = 15 %