A chemistry graduate student is given 250. mL of a 0.40M pyridine (C₂H₂N) solution. Pyridine is a weak base with K₁=1.7 × 10⁹. What mass of C₂H₂NHBr should the student dissolve in the C₂H₂N solution to turn it into a buffer with pH = 4.75? You may assume that the volume of the solution doesn't change when the CH NHBr is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits.

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Acid Base Titration

An acid-base titration is the method of quantitative analysis for determining the concentration of an acid and base by exactly neutralizing it with a standard solution of base or acid having known concentration.