6. Determine the normal concentration of formic acid if the refractive index of a 12.21% solution is 1.3405, and the refractive index of the solution under study is 1.3375, taking into account the fact that there is a linear relationship between the concentration and the refractive index in this range . The refractive index of water is 1.3330. p=1.1776 g/ml.

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