40 mL of 0.05 M Na_(2)CO_(3). NaHCO_(3). 2H_(2)O (sesquicarbonate ) is titrated against 0.05 M HCl. X and of HCl is used when phenolphthalein is the indicator in two separate titrations , hence (y-x) is :

40 mL of 0.05 M Na_(2)CO_(3). NaHCO_(3). 2H_(2)O (sesquicarbonate ) is

1.	40 mL of 0.05 M Na_(2)CO_(3). NaHCO_(3). 2H_(2)O (sesquicarbonate ) is titrated against 0.05 M HCl. X and of HCl is used when phenolphthalein is the indicator in two separate titrations , hence (y-x) is :
Answer» 80 mL 30 mL 120 mL none of these Solution :N//A