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2014-05-10T21:15:54+03:00
2 NaOH + H2SO4 ---> Na2SO4 + 2 H2O
40*2 g NaOH.......98 g H2SO4
80 g NaOH...........x g H2SO4        x = 98 g H2SO4
md=ms*c/100=400*20/100=80 g NaOH
cM=masa acid/masa molara acid * volum=>volumul=98/98*0.5=>V=2 litri acid
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