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50 " mL of " a solution containing 1 g e...

50 " mL of " a solution containing 1 g each of `Na_2CO_3`, `NaHCO_3` and `NaOH` was titrated with N HCl. What will be the titre value if:
(a). Only phenolphthalein is used as an indicator?

A

35 ml

B

32.5 ml

C

24.5 ml

D

34.4 ml

Text Solution

Verified by Experts

The correct Answer is:
D
At the end point using phenolphthalein as indicator uses complete NaOH and `(1)/(2)` Meq. of `Na_(2)CO_(3)`.
`:.` Meq of `NaOH + (1)/(2) "Meq of " Na_(2)CO_(3) = "Meq of HCl"`
`(1)/(40) xx 1000 + (1)/(2) xx (1)/(106) xx 2 xx 1000 = V xx 1 :. V = 34.4 ml`
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