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2014-09-27T17:07:20+03:00
Md = 900 * 49/100 = 441 g H2SO4
H2SO4 + 2 NaOH ---> Na2SO4 + 2 H2O
98 g H2SO4......40 g NaOH
441 g H2SO4...........x g NaOH       x = 180 g NaOH
ms = md/c*100 = 180/20 * 100 = 900 g solutie