50 ML Of 0.04 M Solution Of Sodium Sesquicarbonate (Na2CO3.NaHCO3.2H2O) Is Titrated With 0.05 M HCl. V1 mL Of HCl Is Used When Phenolphthalein Acts As Indicator And V2 mL Of HCl Is Used When Methyl Orange Is The Indicator In The Two Separate Titrations. The Two Titration Values V1and V2 differ By

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50 mL of 0.04 M solution of sodium sesquicarbonate (Na2CO3.NaHCO3.2H2O) is titrated with 0.05 M HCl. V1 mL of HCl is used when phenolphthalein acts as indicator and V2 mL of HCl is used when methyl orange is the indicator in the two separate titrations. The two titration values V1and V2 differ by


Correct option is

120 ml


Na2CO3.NaHCO3 +HCl → 2NaHCO3 +NaCl

(Phenolphthalein indicator)

Na2CO3.NaHCO3 + 3HCl→

3NaCl + 2CO2 + 2H2O (Methyl orange indicator ‘n’=factor = 3 ;)



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