117. Задачка по химии №011 771

The coefficients of the Shishkovsky equation for an aqueous solution of valeric acid at 273 K are: A=9.62*10-2 mol/l, B=0.195. At what concentration is the surface tension of the solution 52.1 mN/m if the surface tension of water at a given temperature is 75.5 mN/m?

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