Răspunsuri

2014-03-09T16:57:50+02:00
Conc molara=nr moli/volum=masa NaOH/(masa molara NaOh * volumul solutiei)
volumul solutiei=masa NaOH/(masa molara NaOH * conc molara)
volumul=20/(0,5*40)=20/20=>vol NaOH = 1 litru