Consider a beaker containing 50 mL of 0.20 M of a weak base (B) with a pKa of 6.55.    What volume of 0.20 M HB+ (the conjugate acid of the weak base, B) should be added to the beaker make a buffer with pH 6.46?

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Q: I don't know how you got the answer, can you plz do the math step by step.

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Q: What is the percent abundance (in units of percent) of zinc in a sample whose density is 7.639 g/mL…

A: The explanation is given below-

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.