You have two different concentrations of a buffer solution, 2.0 M and 0.20 M, to which 0.01 mol HCl has been added. Which of these solutions has the higher buffer capacity?  In other words, which would be able to resist pH via the addition of acid longer?

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Q: Why is pyridine added to the following reaction?

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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.