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標題: AL Chem-Chemical equilbria既計數問題 [打印本頁]

作者: QQQQQas 時間: 09-3-15 10:13 PM 標題: AL Chem-Chemical equilbria既計數問題

AL Chem-Chemical equilbria既計數問題
When excess solid Mg(OH)2 is shaken with 1.00 dm3of 1.00M NH4Cl solution,the resulting saturated solution has a pH of9.0 at 298K.
equation:Mg(OH)2 + 2NH4+ --->Mg2+ + 2NH3 + 2 H2O
Given that Kb for ammonia is 1.8*10^-5 mol dm-3 at 298K,calculate the concentration of NH3 and the NH4+ ion

作者: h2oplusplus2 時間: 09-3-15 10:58 PM

希望無錯LA...好耐無計LA..

圖片附件: 1.gif (09-3-15 10:58 PM, 3.92 KB) / 下載次數 42
https://www.2000fun.com/forum.php?mod=attachment&aid=MTQ5NDI5fDJlOGVjMDc1fDE3ODA0MTM3MTd8MA%3D%3D

作者: QQQQQas 時間: 09-3-15 11:02 PM

點解 [NH4+]+[NH3] = 1?

作者: Naozumi 時間: 09-3-15 11:34 PM

因為題目話用左1.00 dm3of 1.00M NH4Cl

作者: QQQQQas 時間: 09-3-16 08:36 PM

原帖由 Naozumi 於 2009-3-15 11:34 PM 發表
因為題目話用左1.00 dm3of 1.00M NH4Cl

都係唔係好明,,可以再解釋下嗎?

作者: Naozumi 時間: 09-3-16 08:51 PM

no of moles of NH4 = 1M x 1 dm^3 = 1

作者: h2oplusplus2 時間: 09-3-17 01:31 AM

因為佢一開始D NH3 係1M, 但係有D NH3 變左做NH4+, 所以呢D NH4+都係由NH3黎,

禁就話[NH3] + [NH4+] = 1

明未?

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