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Question

Consider titration of NaOH solution versus 1.25 M oxalic acid solution. At the end point following burette readings were obtained.

(i) 4.5 mL (ii) 4.5 mL (iii) 4.4 mL (iv) 4.4 mL (v) 4.4 mL

If the volume of oxalic acid taken was 10.0 mL. Then the molarity of the NaOH solution is M. (Rounded-off to the nearest integer)

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Solution

Since, 4.4 mL is repeated thrice, it is taken as the final value.
Equivalent of NaOH = Equivalent of Oxalic acid
[NaOH]×1×4.4=5/4×2×10
[NaOH]=100/4×4.4=25/4.4=5.68
Nearest integer = 6 M.

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