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Q.

50 mL of a solution containing 1 g each of Na2CO3,  NaHCO3 and NaOH was titrated with N-HCl. What will be the titre reading when only phenolphthalein is used as indicator ?

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a

35 mL

b

32.5 mL

c

24.5 mL

d

34.4 mL

answer is D.

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Detailed Solution

At the end point using phenolphthalein as indicator uses complete NaOH and 12  Meq.  ofNa2CO3.

   Meq.  of  NaOH+12Meq.  ofNa2CO3=Meq.  of  HCl140×1000+12×1106×2×1000=V×1   V=34.4  ml

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