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Per NCERT §6.13, a buffer made from ammonia and ammonium chloride (pKb ≈ 4.75; conjugate-acid pKa ≈ 9.25) at equimolar concentrations gives pH closest to which value?
A4.75
B9.25
C7.00
D12.50
Answer & Solution
Correct answer: B. 9.25
NCERT §6.13: NH₃/NH₄⁺ buffer at equimolar ⇒ pH ≈ 9.25 (the pKa of NH₄⁺).
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