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When one drop of a concentrated HCl solution is added to one litre of pure water at 25C , the pH drops suddenly from 7 to about 4. When the second drop of the same acid is added, pH of the solution further drops to about A. 3.7 B. 2.0 C. 1.0 D. 0
H3O+ formed = 10^-4 + 10^-7Neglect 10^-7Thus, concentration of HCl solution = concentration of h3o+ New H3O+ concentration = 10^-4 + 10^-4 = 2 × 10^-4Ph = 4 - log 2 = 3.7
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