A buffer solution is prepared that is 0.18 M NH 3 and 0.27 M NH 4 Cl. What is th
ID: 523397 • Letter: A
Question
A buffer solution is prepared that is 0.18 M NH3 and 0.27 M NH4Cl. What is the pH of this buffer? Kb for NH3 is 1.8 x 10-5 ANSWER: 9.08 Please show step by step work! A buffer solution is prepared that is 0.18 M NH3 and 0.27 M NH4Cl. What is the pH of this buffer? Kb for NH3 is 1.8 x 10-5 ANSWER: 9.08 Please show step by step work! A buffer solution is prepared that is 0.18 M NH3 and 0.27 M NH4Cl. What is the pH of this buffer? Kb for NH3 is 1.8 x 10-5 ANSWER: 9.08 Please show step by step work!Explanation / Answer
Kb = 1.8*10^-5
pKb = - log (Kb)
= - log(1.8*10^-5)
= 4.74
use:
pOH = pKb + log {[conjugate acid]/[base]}
= 4.74+ log {0.27/0.18}
= 4.92
use:
pH = 14 - pOH
= 14 - 4.92
= 9.08
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