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 ?

At the end point using phenolphthalein as indicator uses complete NaOH and 12  Meq.  of Na2CO3.∴   Meq.  of  NaOH+12 Meq.  of Na2CO3=Meq.  of  HCl140 × 1000 +12 × 1106 × 2× 1000=V ×1∴   V=34.4  ml