5.7 The constants of the Shishkovsky equation for an aqueous solution of valeric acid at 273 K are given: a = 14.72 * 10-3 and b = 10.4. At what concentration will the surface tension of the solution be 52.1*10-3 N/m, if the surface tension of water at a temperature of 263 K is 72.49*10-3 N/m?

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