Which of the following mixture gives a buffer solution with pH = 9.25 ? Given : pKb (NH4OH) = 4.75 ( — JEE Mains Chemistry Past Papers Chemistry Question
Question
Which of the following mixture gives a buffer solution with pH = 9.25 ? Given : pKb (NH4OH) = 4.75 (A) 0.2M NH4OH (0.4 L) + 0.1M HCl (1L) (B) 0.2M NH4OH (0.5 L) + 0.1M HCl (0.5 L) (C) 0.5M NH4OH (0.2 L) + 0.2M HCl (0.5 L) (D) 0.4M NH4OH (1 L) + 0.1M HCl (1L)
Answer: B
💡 Solution & Explanation
ution with pH = 9.25 ? Given : pKb (NH4OH) = 4.75 (1) 0.2M NH4OH (0.4 L) + 0.1M HCl (1L) (2) 0.2M NH4OH (0.5 L) + 0.1M HCl (0.5 L) (3) 0.5M NH4OH (0.2 L) + 0.2M HCl (0.5 L) (4) 0.4M NH4OH (1 L) + 0.1M HCl (1L) Ans. (2) Sol. pOH = pKb + log Salt Base 4.75 = 4.75 + log Salt Base Milimoles of [Salt] = milimoles of [Base] Option (D) : NH4OH + HCl NH4Cl + H2O 0.2M, 0.5L 0.1M, 0.5L 100 mmole 50 mmole 50 mmole – 50 mmole Milimoles of NH4OH = milimoles of NH4Cl
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