Help me understand the Henderson-Hasselbalch Equation it helps to prepare a buffer from a given pH but the book says "you need to find a conjugate acid-base pair in wich the pka of the acid is close to the desired pH" why does pka have to be close to the desired pH?? that's where the book lost me. could someone help me understand this equation in simpler words?

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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.