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Buffer capacity is maximum when __________

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Buffer capacity is maximum when __________

(a) One mole of NH4Cl is added to two moles of NH4OH

(b) One mole of NH4Cl is added to one moles of NH4OH

(c) One mole of NH4Cl is added to one mole of NaOH

(d) One mole of NaCl is added to one mole of NaOH

This question was addressed to me during an online exam.

My question is from Buffering against pH changes in Biological Systems in chapter Water Basics of Biochemistry

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Right choice is (b) One mole of NH4Cl is added to one moles of NH4OH

For explanation: Buffer has more capacity when pH = pKa.

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