已知在448℃时,反应H2(g)+I2(g)
2HI(g)的平衡常数K1为49,则该温度下反应
H2(g)+
I2(g)
HI(g)的平衡常数K2为___ 。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d30bd52fbc729100498b5300daf60350.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cfa1e7ffae662aefb49a44c52d4954d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cfa1e7ffae662aefb49a44c52d4954d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d30bd52fbc729100498b5300daf60350.png)
更新时间:2020-12-24 19:03:53
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【知识点】 化学平衡常数的概念及表达方式解读
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【推荐1】已知:N2(g)+3H2(g)
2NH3(g)的平衡常数为K1,
N2(g)+
H2(g)
NH3(g)的平衡常数为K2,NH3(g)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de4ac184aef047428370bf877105fa50.png)
N2(g)+
H2(g)的平衡常数为K3。
(1)写出K1和K2的关系式:_______ ;
(2)写出K2和K3的关系式:_______ ;
(3)写出K1和K3的关系式:_______ 。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de4ac184aef047428370bf877105fa50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de4ac184aef047428370bf877105fa50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de4ac184aef047428370bf877105fa50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
(1)写出K1和K2的关系式:
(2)写出K2和K3的关系式:
(3)写出K1和K3的关系式:
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解题方法
【推荐2】在一定温度下,已知以下三个反应的平衡常数:
反应①:CO(g)+CuO(s)
CO2(g)+Cu(s) K1
反应②:H2(g)+CuO(s)
Cu(s)+H2O(g) K2
反应③:CO(g)+H2O(g)
CO2(g)+H2(g) K3
(1)反应①的平衡常数表达式为___________ 。
(2)反应③的K3与K1、K2的关系是K3=___________ 。
反应①:CO(g)+CuO(s)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e98feedde5546db26eb490641ba3a817.png)
反应②:H2(g)+CuO(s)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e98feedde5546db26eb490641ba3a817.png)
反应③:CO(g)+H2O(g)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e98feedde5546db26eb490641ba3a817.png)
(1)反应①的平衡常数表达式为
(2)反应③的K3与K1、K2的关系是K3=
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【推荐3】电离平衡常数和电离度(电离度是指已电离的电解质分子数占原来总分子数的百分比)均可衡量弱电解质的电离,下表是常温下几种弱酸的电离平衡常数(
)和弱碱的电离平衡常数(
),回答下列问题∶
(1)
的水溶液呈_______ (填“酸性”、“中性”或“碱性”),理由是_______ 。溶液中各离子浓度大小关系是________ 。
(2)
的电离平衡常数表达式![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64a963177daa2a973b034d670cf2f6a7.png)
_______ ,现测得溶解了
的某盐酸的pH=4,则该溶液中
的电离度约为________ 。
(3)常温下,浓度相同的三种溶液NaF、
、
,pH由大到小的顺序是___________ 。
(4)将过量
通入
溶液中,反应的离子方程式为___________ 。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88951b52e016825b6645fd3baa8f5f8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1222888b56858fea0224b7230db188a9.png)
弱酸或弱碱 | HF | ![]() | ![]() | ![]() | ![]() |
电离平衡常数 | ![]() | ![]() | ![]() ![]() | ![]() ![]() | ![]() |
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29109888f4fb3543bb8c75af62e22f46.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/624cfde5889eb5269fdac20cb1b2753b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64a963177daa2a973b034d670cf2f6a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/624cfde5889eb5269fdac20cb1b2753b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/624cfde5889eb5269fdac20cb1b2753b.png)
(3)常温下,浓度相同的三种溶液NaF、
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd46a1a853c372c1fb6c7a88cd947e87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b779f39f58dc21cf9153e15b0a9a65b.png)
(4)将过量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/624cfde5889eb5269fdac20cb1b2753b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd46a1a853c372c1fb6c7a88cd947e87.png)
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