21. Find pAg and pCl when titrating silver nitrate with sodium chloride at the moment when to 25 cm3 of AgNO3 solution; C(AgNO3) = 0.1 mol/dm3 NaCl solution with C(NaCl) = 0.1 mol/dm3 was added in the amount of 1) 24 cm3; 2) 25 cm3 and 3) 26 cm3. PRAGCl=1.11*10-10

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