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What is the pH of a buffer solution containing 0.40M NH 4 Cl and 0.17M of NH 3 if the pKa of NH 4 +

What is the pH of a buffer solution containing 0.40M NH₄Cl and 0.17M of NH₃ if the pKa of NH₄+ is 9.25. Can use the 5% approx rule.

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