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What volume of 1M NaOH (in ml)will required to react completely with 100 gm of Oleum which is 109 % labelled ?.

SOLUTION: We know that 109% Oleum sample contains 40 gm SO3 and 60 gm H2SO4
                     (E wt= SO3=80/2=40 gm and E wt  H2SO=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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