• Pyridine (C5H5N) → neutral amine → weak base
• No acid added to the solution yet
• calculate pH of pyridine before titration (0 mL of acid is added)
A 25.0-mL sample of 0.125 M pyridine is titrated with 0.100 MHCl. Calculate the pH at 0 mL of added acid. Express your answer using two decimal places.
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