2. Calculate the mass fraction (%) of sodium chloride in an isotonic solution, if 50.00 cm3 of a 0.0500 mol / dm3 solution of silver nitrate (Kp = 1.0080) was added to 10.00 cm3 of the solution, for the titration of the excess of which 21, 00 cm3 of an ammonium thiocyanate solution with a concentration of 0.0500 mol/dm3 (Kp = 0.9820).

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