In aqueous media, why does ammonia act as a base whereas hydrogen fluoride acts as an acid?
ans: high electronegativity of F, rather than N favours acid properties because protons receive less shielding, H+ is easier to release.
I don't understanding what is meant by less shielding...
ammonia and hydrogen fluoride
2008-09-12 6:40 am
回答 (2)
2008-09-12 8:22 pm
✔ 最佳答案
The shielding effect is relative to the no. of outermost shell electrons.The less shielding means that the stronger nuclear attraction.
The high nuclear charge of N can attract protons (H+) to the greater extent. Hence, N is favour to accept protons while F is favour to donate proton.
Why does F have higher shielding effect than N?
The no. of outermost shell electrons of F is 7 whereas that of N is 5.
2008-09-21 22:27:06 補充：
hydrogen ion如同一粒proton..要記住唷
參考: Myself
2008-09-15 3:49 am
you consider less shielding as "more attracted to nucleus"
收錄日期: 2021-04-13 16:04:04
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