Welcome to ChemZipper !!!: 0.5 gm of fume H2SO4 (Oleum ) is diluted with water, this solution is completely neutralised by 26.7 ml of 0.4 N NaOH. Find the percentage free SO3 in sample solution.?

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0.5 gm of fume H2SO4 (Oleum ) is diluted with water, this solution is completely neutralised by 26.7 ml of 0.4 N NaOH. Find the percentage free SO3 in sample solution.?

SOLUTION: Given total wt of Oleum sample is 0.5 gm, let x gm SO3 and (0.5-x) H2SO4  
                             (E wt= SO3=80/2=40 gm and E wtH2SO4=98/2=49 gm)
At equivalent point     
      No of equivalent of SO+ No of equivalent H2SO4= no of equivalent of NaOH

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