有咩gas係酸性??

2007-10-07 3:54 am

✔ 最佳答案

酸性氣體係拍當該氣體溶落水後會釋出H+離子(ion)而令溶液變成酸性.

例子有好多: Cl2, F2, CO2, SO2, NO2, HCl等等

係......但第七族中的I碘iodine 和 At都係固體...所以就唔係酸性"氣體" 啦XDDD

酸性氣體因在水中有H+ ion, 所以多數會同alkaline的OH- ion做neutrlization???
為何有少數唔會呀, 因為有d可能會同alkaline做其他反應instead of neutrlization..好似NO2咁, 溶落水會有HNO2 and HNO3, HNO3係strong oxdizing agent(u must hv learn it), 同會氧化NaOH 中的 OH-ion to O2. So it will do redox reaction instead in 中和.

咁溶左落水o既gas e.g. SO2同NaOH o既reaction係咪neutralization???
SO2 + H2O = H2SO3
H2SO3 + 2NaOH = Na2SO3 + 2H2O
個反應係得salt and water as only product so it is a neutrlization

2007-10-06 19:55:29 補充：
好多非金屬氣體的氧化物(non-metal oxide) 都係酸性氣體. (e.g. NO2, SO2, N2O5, CO2..etc)

2007-10-06 19:56:08 補充：
佢地好多就算唔係酸性氣體...都係酸性

參考: hope it can help u ar.for other question, plx contact me in my msn

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Shirley

2007-10-03 3:01 am

gas本身係唔會分酸性定鹼性
但當gas溶落水就有酸鹼之分
例如carbon dioxide, chlorine溶落水會變酸
chlorine遇moist blue litmus paper會變紅
then變白
一般的gas溶落水到都係neutral的

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