244. The refractive index of the analyzed aqueous solution containing an impurity of pyridine, at 20 C, was found to be 1.5092. Calculate the percentage of pyridine in this solution if the refractive indices of the two reference solutions at 15.6 and 17.86% pyridine are 1.4890 and 1.5196, respectively. Use the linear interpolation method.

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