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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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jueee_ jueee_
wrote...
Posts: 21
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11 years ago
It's pH at NTP should be 9.0.
I have 0.2M ammonium chloride solution and 0.1M ammonia solution.
Kb(ammonia)= 2.0*10^-5

Do I really need all this information? I've tried solving it with the Henderson-Hasselbalch equation but I suppose I can't use it in the right way... Any help is appreciated!
Anyone..... ?
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wrote...
#1
11 years ago
pKb = 4.7
pOH = 14 - pH = 5

5 = 4.7 + log [NH4+]/ [NH3]

10^0.3 = 2 = [NH4+]/ [NH3]

the ratio between NH4+ and NH3 must be 2
0.2 / 0.1 = 2

so equal volumes of NH4Cl and NH3 must be used
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