ammonia solution 的 reaction

2008-03-31 6:35 am
求full equation

1) ammonia solution + hydrochloric acid

2) ammonia solution + nitric acid

最好有explanation啦...因為ammonia solution 的reaction同其他alkalis好吾同...我一d都吾識寫<<其他alkalis就識

回答 (3)

2008-03-31 11:53 pm
✔ 最佳答案
答案:
1) NH3 + HCl → NH4C l
2) NH3 + HNO3 → NH4NO3

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方法:
假設 acid 是 HA,the equation is :
NH3 + HA → NH4A

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為甚麼這樣寫?
Neutralization 是 reaction between H+ and OH- ions。
而不是 reaction between molecules.

Neutralization 的過程是:
Ionization of acid: HA → H+ + A-
Ionization of NH3: NH3 + H2O → NH4+ + OH-
Neutralization: H+ + OH- → H2O

Add all the above equations:
HA + NH3 + H2O + H+ + OH- → H+ + A- + NH4+ + OH- + H2O
消去兩邊相同的物質,變成:
HA + NH3 → A- + NH4+
寫成 full equation:
HA + NH3 → NH4A

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不可寫 NH4OH,因為它不存在。
以前一條 CE 的 MC,問哪物質不存在,答案是 NH4OH。
在 NH3 溶液中,大部份是 NH3,只有低於 5% 是 NH4+ 和 OH-。
2008-03-31 7:54 am
你可以用2條equation
先寫ammonia water出OH-
再寫neutralization
用ionic equation係冇問題的&quot;


最好唔好寫NH4OH
因為冇NH4OH lee樣野ga
NH4+ + OH- → NH3 + H2O


1.
NH3 + H2O ≒ NH4+ + OH-
HCl → Cl- + H+
OH- + H+ → H2O

2. 
NH3 + H2O ≒ NH4+ + OH-
HNO3 → NO3- + H+
OH- + H+ → H2O


p.s.
NH4+ + OH- → NH3 + H2O 係單向箭咀
NH3 + H2O ≒ NH4+ + OH- 係reversible reaction!!!
參考: me =)
2008-03-31 6:59 am
1) NH4OH + HCl------> NH4Cl + H2O
2) NH4OH + HNO3-------> NH4NO3 + H2O


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