当前位置:首页>复习资料>【2026版化学高考步步高大二轮专题复习讲义广东专用版专题六第26练溶液中三大平衡的分析及应用

【2026版化学高考步步高大二轮专题复习讲义广东专用版专题六第26练溶液中三大平衡的分析及应用

  • 2026-03-27 19:53:39
【2026版化学高考步步高大二轮专题复习讲义广东专用版专题六第26练溶液中三大平衡的分析及应用

[分值:50分]

(1~10题,每小题5分)

1.(2025·佛山期中)H3PO2是一种一元弱酸,与等浓度等体积的NaOH溶液完全反应后生成NaH2PO2,下列叙述正确的是(  )

A.NaH2PO2是酸式盐

B.H3PO2溶液中存在电离平衡:H2+H+

C.0.01 mol·L-1H3PO2水溶液加水稀释,pH增大

D.H3PO2溶液与NaOH溶液反应的离子方程式为H++OH-===H2O

答案 C

解析 H3PO2是一种一元弱酸,则NaH2PO2是正盐,A错误;H3PO2是一种一元弱酸,所以只能发生H3PO22+H+,不存在二级电离,B错误;0.01mol·L-1H3PO2水溶液加水稀释,氢离子浓度减小,pH增大,C正确;H3PO2溶液与NaOH溶液反应的离子方程式为H3PO2+OH-===H2+H2O,D错误。

2.(2025·广东模拟预测)葡萄酒中含有的酒石酸(H2T)常用作食品添加剂。已知Na2T溶液呈碱性,NaHT溶液呈酸性。下列说法错误的是(  )

A.0.05 mol·L-1H2T溶液的pH大于1

B.H2T溶液的pH随温度升高而增大

C.NaHT在水中的电离方程式为NaHT===Na++HT-

D.0.01 mol·L-1 Na2T溶液中:c(OH-)=c(H+)+c(HT-)+2c(H2T)

答案 B

解析 Na2T溶液呈碱性,则T2-发生水解反应,H2T的二级电离不完全,0.05mol·L-1H2T溶液的氢离子的浓度小于0.1mol·L-1,pH大于1,故A正确;电离为吸热反应,H2T的电离随温度升高而增大,氢离子浓度变大,pH减小,故B错误;NaHT属于强电解质,H2T的二级电离不完全,故NaHT在水中的电离方程式为NaHT===Na++HT-,故C正确;根据质子守恒得,c(OH-)=c(H+)+c(HT-)+2c(H2T),D正确。

3.(2024·梅州一模)乙氨酸(H2NCH2COOH)是一种两性有机物,可与盐酸反应生成盐酸盐(HOOCCH2NH3Cl)。已知HOOCCH2NH3Cl水溶液呈酸性,下列叙述正确的是(  )

A.0.001 mol·L-1 HOOCCH2NH3Cl水溶液的pH=3

B.0.001 mol·L-1HOOCCH2NH3Cl水溶液加水稀释,pH升高

C.HOOCCH2NH3Cl在水中的电离方程式为HOOCCH2NH3Cl===HOOCCH2NH2+HCl

D.HOOCCH2NH3Cl水溶液中:c(OH-)+c(Cl-)=c(HOOCCH2)+c(HOOCCH2NH2)

答案 B

解析 HOOCCH2NH3Cl为强酸弱碱盐,电离出的HOOCCH2会发生水解,弱碱离子的水解较为微弱,因此0.001mol·L-1HOOCCH2NH3Cl水溶液的pH>3,故A错误;稀释溶液时,HOOCCH2水解程度增大,根据勒夏特列原理可知,溶液中氢离子浓度减小,溶液pH升高,故B正确;HOOCCH2NH3Cl为强酸弱碱盐,在水中的电离方程式为HOOCCH2NH3Cl===HOOCCH2+Cl-,故C错误;根据电荷守恒可知,溶液中c(OH-)+c(Cl-)=c(HOOCCH2)+c(H+),根据元素守恒,有c(Cl-)=c(HOOCCH2)+c(HOOCCH2NH2),都与选项中等式不对应,故D错误。

4.(2025·湛江一模)25 时,H2SeO4第一步完全电离,第二步电离平衡常数Ka=2.18×10-2。则25 时,下列说法正确的是(  )

A.KHSeO4的溶液显碱性

B.K2SeO4溶液中存在c(K+)=2[c(HSe)+c(Se)]

C.0.5 mol·L-1的H2SeO4溶液中,c(HSe)+2c(Se)+c(OH-)=0.5 mol·L-1

D.向H2SeO4溶液中滴加KOH溶液至中性时,=2.18×104

答案 B

解析 H2SeO4第一步完全电离,则KHSeO4只电离不水解,溶液显酸性,A错误;根据元素守恒可知,K2SeO4溶液中存在c(K+)=2[c(HSe)+c(Se)],B正确;根据元素守恒可知,0.5mol·L-1H2SeO4溶液中,c(HSe)+c(Se)=0.5mol·L-1,C错误;向H2SeO4溶液中滴加KOH溶液至中性时,c(H+)=10-7mol·L-1,===2.18×105,D错误。

5.(2024·广东二模)安息香酸(HR)是最简单的一元芳香酸,其钠盐(用NaR表示)的水溶液呈碱性。已知常温下,Ka(HR)>Ka1(H2CO3)。下列说法正确的是(  )

A.常温下,0.001 mol·L-1 HR水溶液的pH=3

B.向NaR水溶液中加水稀释,溶液的pH升高

C.NaR水溶液中,c(HR)+c(H+)=c(R-)+c(OH-)

D.常温下,NaR溶液的碱性比同浓度的NaHCO3溶液弱

答案 D

解析 HR是弱酸,不完全电离,常温下,0.001mol·L-1HR水溶液的pH>3,A错误;NaR水溶液中由于R-水解显碱性,加水稀释水解程度变大,但是碱性变弱,溶液的pH减小,B错误;NaR水溶液中的质子守恒为c(HR)+c(H+)=c(OH-),C错误;已知Ka(HR)>Ka1(H2CO3),HR酸性比碳酸强,根据越弱越水解,同浓度的NaHCO3溶液水解程度大,碱性强,D正确。

6.(2025·广州大联考)赖氨酸[H3N+(CH2)4CH(NH2)COO-,用HR表示]是人体必需氨基酸。常温下,赖氨酸与足量盐酸反应可得盐酸盐(H3RCl2,其水溶液呈酸性),在水溶液中存在电离平衡:H3R2+2R+-。下列叙述正确的是(  )

A.0.01 mol·L-1的H3RCl2水溶液稀释10倍后,pH=3

B.H3RCl2的水溶液中c(H+)<10-7 mol·L-1

C.H3RCl2水溶液中c(Cl-)+c(OH-)+c(R-)=2c(H3R2+)+c(H+)

D.NaR水溶液中R-的水解平衡常数KhK3的关系为Kh·K3=1014

答案 B

解析 0.01mol·L-1H3RCl2的水溶液稀释10倍后浓度为0.001mol·L-1,根据题意,H3RCl2不能完全电离,pH>3,A错误;H3RCl2是盐酸盐,通过H3R2+的电离使溶液呈酸性,抑制了水的电离,水的电离程度减小,c(H+)<10-7mol·L-1,B正确;H3RCl2水溶液中还存在H2R+,电荷守恒关系为c(Cl-)+c(OH-)+c(R-)=2c(H3R2+)+c(H+)+c(H2R+),C错误;NaR水溶液中R-的水解平衡常数KhK3的关系为Kh=,即KhK3的关系为Kh·K3=Kw=10-14,D错误。

7.(2024·广东高三阶段练习)某二元弱酸H2A在常温下的电离平衡常数Ka1=1.0×10-2,Ka2=2.6×10-7。下列说法不正确的是(  )

A.向H2A溶液中加入少量NaOH固体,则变小

B.0.1 mol·L-1H2A溶液中:c(H+)>2c(A2-)+c(HA-)>c(OH-)

C.对H2A溶液升温,溶液的pH变小

D.0.1 mol·L-1NaHA溶液呈酸性

答案 A

解析=,加入少量NaOH固体,氢离子浓度减小,Ka1不变,所以变大,A项错误;溶液中存在电荷守恒:c(H+)=c(HA-)+2c(A2-)+c(OH-),所以c(H+)>2c(A2-)+c(HA-),由于氢氧根离子只由水电离产生,所以浓度最低,B项正确;升温促进H2A的电离,溶液的pH变小,C项正确;0.1mol·L-1NaHA溶液中,HA-既发生水解,又发生电离,其电离平衡常数为Ka2=2.6×10-7,水解平衡常数为Kh===1.0×10-12,电离平衡常数大于水解平衡常数,说明电离程度大于水解程度,溶液呈酸性,D项正确。

8.(2025·梅州二模)柠檬、柑橘等植物中含有丰富的柠檬酸(H3A),其是一种三羧酸类化合物。已知常温下,Ka1(H3A)=7.4×10-4,下列说法正确的是(  )

A.H3A在水中的电离方程式为H3A===3H++A3-

B.Na3A溶液中:c(Na+)<3c(A3-)+2c(HA2-)+c(H2A-)

C.Na3A溶液加水稀释过程中,水的电离程度减小,Kw减小

D.向H3A溶液中滴入小苏打溶液,产生大量气泡,则Ka1(H2CO3)<7.4×10-4

答案 D

解析羧酸为弱酸,故H3A在水中的电离方程式为H3AH++H2A-H2A-++HA2-HA2-++A3-,A错误;根据电荷守恒,c(Na+)+c(H+)=3c(A3-)+2c(HA2-)+c(H2A-)+c(OH-),由于Na3A水解呈碱性,c(OH-)>c(H+),则c(Na+)>3c(A3-)+2c(HA2-)+c(H2A-),B错误;Kw只受温度影响,稀释过程中Kw不变,C错误;H3A溶液中滴入小苏打溶液,产生CO2,根据强酸制取弱酸原理,H3A酸性大于H2CO3,则Ka1(H2CO3)<7.4×10-4,D正确。

9.(2025·中山二模)25 时,苯胺(C6H5NH2)的电离平衡常数Kb=4×10-10。下列说法正确的是(  )

A.苯胺的电离方程式为C6H5NH2+H2O===C6H5N+OH-

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  1. CONNECT:[ UseTime:0.001033s ] mysql:host=127.0.0.1;port=3306;dbname=i_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001711s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000771s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000732s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001576s ]
  6. SELECT * FROM `set` [ RunTime:0.000640s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001742s ]
  8. SELECT * FROM `article` WHERE `id` = 462532 LIMIT 1 [ RunTime:0.001383s ]
  9. UPDATE `article` SET `lasttime` = 1774764502 WHERE `id` = 462532 [ RunTime:0.004912s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000770s ]
  11. SELECT * FROM `article` WHERE `id` < 462532 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001385s ]
  12. SELECT * FROM `article` WHERE `id` > 462532 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001204s ]
  13. SELECT * FROM `article` WHERE `id` < 462532 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002121s ]
  14. SELECT * FROM `article` WHERE `id` < 462532 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002103s ]
  15. SELECT * FROM `article` WHERE `id` < 462532 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004316s ]
0.226409s