Răspunsuri

2014-09-20T17:41:33+03:00
C/100=md/ms => 20/100=400/ms => ms=2000g solutie de NaOh => 400 g NaOH si 1600 g H2O
Mda,am gresit, deoarece 400 e ms si eu am pus md
2014-09-20T18:37:41+03:00
Md = ms * c/100 = 400 * 20 /100 = 80 g
ms = md + m apa => m apa = 400 - 80 = 320 g