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Magalaki713
03.12.2019 •
Chemistry
The k b kb for an amine is 4.004 × 10 − 5 . 4.004×10−5. what percentage of the amine is protonated if the ph of a solution of the amine is 9.370 9.370 ? assume that all oh − oh− came from the reaction of b with h 2 o . h2o. percentage protonated: %
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Ответ:
The percentage of amine is protonated is 63,07%
Explanation:
The reaction of an amine RNH₃ (weak base) with water is:
RNH₃ + H₂O ⇄ RNH₄⁺ + OH⁻
The kb is defined as:
As kb = 4,004x10⁻⁵ and [OH⁻] is
:
1,708 = [RNH₄⁺] / [RNH₃] (1)
As the total amine is a 100%:
[RNH₄⁺] + [RNH₃] = 100% (2)
Replacing (1) in (2):
1,708 [RNH₃]+ [RNH₃] = 100%
2,708 [RNH₃] = 100%
[RNH₃] = 36,93%
Thus,
[RNH₄⁺] = 63,07%
The percentage of amine protonated is 63,07%
I hope it helps!
Ответ:
Explanation:
Atoms with a low electronegativity, like lithium, have a weak attractive force for electrons because they have few valence electrons and aren't close to having eight valence electrons.