Q.

40 g NaOH, 106 g Na2CO3 and 84 g NaHCO3, are dissolved in water and the solution is made 1 litre. 20 mL of this stock solution is titrated with 1N HCl, hence which of the following statements are correct.

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a

The tire reading of HCl will be 80mL, if methyl orange is used as indicator from the very beginning

b

The titre reading of HCl will be 40mL if methyl orange is used indicator after 1st end point

c

The titre reading of HCl will be 40 mL, if phenolphthalein is used indicator from the very beginning

d

The titre reading of HCl will be 60mL if phenolphthalein is used indicator from the very beginning

answer is A, D.

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Detailed Solution

When phenolphthalein is used from the beginning then,
Milliequivalents of Acid=Milliequivalents ofNaOH+12Na2CO3 1×1×Vin mL=1×20×1+1×20×22 V(in mL)=40 mL
Similarly, after Ist end point, using methyl orange:

Milliequivalents of Acid=Milliequivalents ofNaHCO3+12Na2CO3

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