Published by:
CGP EDU Academic Team
Published on: August 13, 2026
A solution containing 
and NaOH requires 300 ml of 0.1 N HCl using phenolpthalein as an indicator. Methyl orange is then added to the above titrated solution when a further 25 ml of 0.2 N HCl is required. The amount of NaOH present in solution is 
Text Solution
Verified by ExpertsThe correct answer is:
B
(I) Phenopthalein indicate partial neutralisation of 
Meq. of 
+ Meq. of NaOH = Meq. of HCl
(Suppose 
, NaOH = bgm )
.....(i)
(II) Methyl orange indicate complete neutralisation
HCl HCl
, 
excess
.....(ii)
From (i) and (ii)
b =1 gm.
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