6. The molar electrical conductivity of a formic acid solution at 25 ° C and a dilution of 1024 l / mol is 143.9 * 10-4 Sm * m2 * mol-1, and at infinite dilution - 406.5 * 10-4 Sm * m2 * mol-1. Determine the ionization constant of the acid and the pH of the solution.

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