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Grade: 11

                        

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

2 years ago

Answers : (1)

Devashish
13 Points
							
H3O+ formed =  10^-4 + 10^-7
Neglect 10^-7
Thus, concentration of HCl solution = concentration of h3o+ 
New H3O+ concentration = 10^-4 + 10^-4
                                                = 2 × 10^-4
Ph = 4 - log 2
      = 3.7
one year ago
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