有關phosphoric acid問題，

👨🏻‍🏫 學術台化學

osiris

2007-11-30 4:18 am

Phosphorus can from three acids

H3PO4 , H3PO3 , H3PO2

but I want to ask which one is the most acidic? Explain.

更新1:

首先多謝你肯答，不過… 如果我比個數據你，話比你知H3PO2係3者中最strong 既acid，你仲會唔用oxidation state 黎答我？ H3PO2 p Ka1= 1.2 H3PO3 p Ka1=2 H3PO4 p Ka1= 2.12

回答 (2)

furuta027

2007-12-09 9:07 am

✔ 最佳答案

H-P-OH　HO-P-OH　　O
　Ｉ　　　　Ｉ　　　　 II
　OH　　　OH　　HO-P-ＯＨ
　　　　　　　　　　　I
　　　　　　　　　　　OH
二元酸　三元酸　　三元酸
H3PO2　H3PO3　　H3PO4

我諗都係穩定性....
我認為當H3PO4生成H2PO4-時,
因為lone pair排斥力>bond pair, O= 同 2個-OH會被-O -排斥.....
三隻野"痴"一齊令佢唔穩定.....所以Ka下降(表達能力太差...)

同樣.(h2po2)- 因為少bond.....分配較好及易~所以穩定~

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Hoi Ming

2007-11-30 5:45 pm

The acidity of non-metallic compound (molecules) can be noticed from the oxidation number(O.N.).
Here are the 3 different O.N. of P in 3 cases
H3PO4 : O.N of P = +5
H3PO3 : O.N of P = +3
H3PO2 : O.N of P = +1
The higher the O.N. of P, the more acidic the compound is.

參考: me

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