Question

Peste 250 grame solutie de concentratie procentuala 40% se adauga 150 g de apa.sa se calculeze concentratia procentuala a solutiei finala

Answer 1

ms = 250 g , c% = 40%

m.apa = 150 g

ms.tot = ms + m.apa = 250+150 = 400 g

din c% = mdx100/ms

=> md = 250x40/100 = 100 g

=> c%.finala = mdx100/ms.tot

= 100x100/400 = 25%