Question

Se amesteca o solutie de concentratie 10% (1kg) cu 1 kg de solutie de concentratie 3%. Calculati concentratia procentuala finala

Answer 1

c% = md x 100 / ms

ms1 = 1 kg

c1% = 10% => md1 = ms1 x c1 / 100 = 10 x 1 / 100 = 0,1 kg

ms2 = 1 kg

c2% = 3% => md2 = ms2 x c2 / 100 = 3 x 1 / 100 = 0,03 kg

=> md tot. = md1 + md2 = 0,13 kg,

  ms tot. = ms1 + ms2 = 2 kg,

c% final = md.tot x 100 / ms.tot => c% = 0,13 x 100 / 2 = 6,5%