43. Calculate the molar concentration of the equivalent of perchloric acid solution if the following results were obtained during photometric titration of a 0.0696 g sample of diphenylguanidine (C13H13N3) with the indicator tropeoline at λ=540 nm
V(HCLO4) 0.0 1.0 2.0 2.4 2.8 3.2 3.4 3.6 3.8 4.0 4.2 4.4 4.8
A 0.07 0.07 0.08 0.09 0.10 0.13 0.17 0.330 0.370 1.07 1.07 1.07 1.07

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