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2026年全国高考四川化学试卷15题解析

2026年全国高考四川化学试卷15题解析

很多同学做到这道酸碱滴定图像题直接心态崩盘:一眼四条曲线分不清谁是谁,pM、η两个新定义瞬间打乱思路,分不清p、p、pc(H+)三条曲线的变化趋势,弱酸电离常数、水的电离、守恒式判断混为一团。要么凭直觉乱判曲线,要么忽略pM=-lgM的对数反向逻辑,算Ka时符号颠倒,电荷、物料守恒联立变形总出错,强弱酸对比、滴定过程离子浓度动态变化更是高频丢分点,这道题把水溶液平衡所有易混痛点全部集齐。

2026年全国高考四川化学试卷15题解析

2026年6月24日

第一部分原题呈现】

15.常温下,用0.1000mol·L-1的NaOH溶液分别滴定20.00mL浓度均为0.1000mol·L-1的两种一元弱酸(HA)溶液,部分微粒浓度的值或微粒浓度比的pM[pM=-lgM,M代表]与(滴定剂与被滴定溶液的体积比)之间的关系如图所示。下列说法错误的是

A.Ⅲ代表两种弱酸中较强的弱酸滴定过程中p[]随的变化曲线

B.a、c两点溶液中水的电离程度c<a

C.b点溶液对应酸的电离常数Ka=10-4.78

D.d点溶液中c(H+)+c(HA)<c(A-)+c(OH-)

第二部分整体概述】

本题以等浓度NaOH滴定两种等浓度一元弱酸为载体,引入两个全新定义:=、pM=-lgM,M限定三类微粒比值/浓度:。滴定过程从0到1,代表酸逐步被中和生成NaA:随NaOH加入,c(H+)持续减小、持续增大、持续增大;结合pM负对数规则,数值变化趋势与M完全相反,由此区分四条曲线归属。再结合起点数据计算电离常数,对比水的电离程度,联立守恒式判断离子浓度不等式,融合强弱弱酸对比、电离平衡、盐类水解三大核心模块。有几个考查特点:1.新信息现场解读型:陌生符号pM、,要求即时转化对数与浓度关系,不依赖机械背诵。2.多曲线区分识图型:同一滴定体系四条曲线,依托平衡移动规律区分每条曲线对应物理量,考查趋势逻辑。3.定量计算定性结合型:利用起点坐标定量计算弱酸电离常数,同时定性分析水的电离、离子浓度大小。4.多平衡综合串联型:弱酸电离、水的电离、A-水解三大平衡同步考查,对比两种弱酸的电离能力差异。5.守恒式变形推导型:电荷、物料守恒联立化简判断离子浓度不等式,避开直接比较浓度的常规套路。

第三部分选项详解】

曲线对应微粒判定。已知pM=-lgM,滴定中增大(加NaOH):①M=c(H+)↓,pc(H+)=-lgc(H+)=pH↑→曲线Ⅰ、Ⅱ持续上升,且酸性较的应在上方,故Ⅰ代表酸性较弱的弱酸,Ⅱ代表酸性较强的②M=HA+OH-=A-+H2O,↑,p=-lg↓→曲线Ⅲ、Ⅳ持续下降,因初始HA为0.1000mol·L-1,则p小于但接近于1,故曲线Ⅳ代表p③M==0时,a点p=8.22,即=10-8.22,又c(H+)·c(OH-)=10-14,则c(OH-)=10-11.11 mol·L-1,c(H+)=10-2.89mol·L-1,可得pc(H+)=2.89,因曲线Ⅰ(较弱的弱酸)起点小于但接近于3,故曲线Ⅲ代表较弱弱酸p

A选项:Ⅲ代表两种弱酸中较强的弱酸滴定过程中p[]随的变化曲线

曲线归属定性判断。p对应曲线Ⅲ,但代表的是较弱弱酸滴定过程中p[]随的变化曲线,所以A选项错误。

B选项:a、c两点溶液中水的电离程度c<a

氢离子浓度对比法。a点p=8.22,即=10-8.22,又c(H+)·c(OH-)=10-14,则c(OH-)=10-11.11mol·L-1,c(H+)=10-2.89mol·L-1;c点为曲线Ⅱ代表酸性较强酸的起点,pc(H+)=1.95,即c(H+)=10-1.95mol·L-1,因c(H+):c>a,酸电离出H+抑制水的电离,氢离子浓度越大,水的电离被抑制程度越强,水电离程度越小,故水电离c<a,所以B选项正确。

C选项:b点溶液对应酸的电离常数Ka=10-4.78

电离常数表达式计算。b是对应较弱酸(设为HB)的起点,由a点可计算b点c(H+)。a点为较弱酸的p,此时p=8.22,即=10-8.22,又因为c(H+)·c(OH-)=10-14,则c(OH-)=10-11.11mol·L-1,c(H+)=10-2.89mol·L-1,即b点c(H+)=10-2.89mol·L-1,b溶液对应较弱酸(设为HB)的电离常数表达式Ka ==10-4.78,所以C选项正确

D选项:d点溶液中c(H+)+c(HA)<c(A-)+c(OH-)

守恒联立推导。电荷守恒:c(Na+)+c(H+)=c(A-)+c(OH-)①,物料守恒:2c(Na+)=c(HA)+c(A-)②,将②代入①:+c(H+)=c(A-)+c(OH-),两边×2:c(HA)+c(A-)+2c(H+)=2c(A-)+2c(OH-),整理:c(HA)+2c(H+)=c(A-)+2c(OH-),变形:c(H+)+c(HA)=c(A-)+c(OH-)+c(OH-)-c(H+),d点为弱酸体系,HA电离大于A-水解,溶液呈酸性,c(H+)>c(OH-),则c(OH-)-c(H+)<0,因此c(H+)+c(HA)<c(A-)+c(OH-),所以D选项正确。

综上所述,A选项错误,为本题正确答案。

第四部分必备知识】

1.弱酸电离平衡:电离常数Ka表达式、Ka只与温度有关、酸性强弱与Ka大小关系。

2.水的电离平衡:酸/碱抑制水的电离,弱酸根水解促进水的电离,水电离氢离子浓度计算。

3.对数定义拓展:pH=-lgc(H+)迁移至pM=-lgM,负对数数值变化与浓度变化反向。

4.酸碱滴定过程离子变化:强碱滴定弱酸,HA、A-、H+、OH-浓度动态变化规律。

5.溶液三大守恒:电荷守恒、物料守恒、质子守恒,守恒式联立变形推导离子浓度关系;

6.盐类水解:弱酸阴离子A-水解平衡,电离与水解程度对比判断溶液酸碱性。

7.图像曲线趋势判断:平衡移动方向对应微粒浓度变化,反向推导pM曲线升降。

8.离子浓度大小比较:混合弱酸+弱酸盐体系的浓度定性判断。

第五部分  复习启示

1.摒弃“背图像模板”的低效学习法,掌握“平衡移动→微粒浓度变化→pM曲线趋势”的通用分析逻辑,灵活应对陌生图像。

2.建立定量计算习惯,遇到坐标图像优先提取起点、交点数据,结合平衡常数公式计算,不凭主观感觉判断。

3.规范守恒式推导步骤,遇到离子浓度不等式,优先联立电荷、物料守恒代数变形,减少直观猜测失误。

4.整理水溶液平衡易错点:负对数数值变化反向、酸抑制水电离、Ka变形公式、强弱酸对比四类高频丢分点,建立错题本。

5.主动接触创新情境试题,克服“看到新符号就畏难”的心理,训练信息转化的临场应变能力。

说明

因本人水平有限,以上解析仅代表个人观点,仅供诸君参考审度,其中可能存在不足之处,敬请诸君批评指正,不胜感激!

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  1. CONNECT:[ UseTime:0.000503s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000701s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.003146s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000259s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000558s ]
  6. SELECT * FROM `set` [ RunTime:0.000202s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000564s ]
  8. SELECT * FROM `article` WHERE `id` = 816849 LIMIT 1 [ RunTime:0.000611s ]
  9. UPDATE `article` SET `lasttime` = 1782731578 WHERE `id` = 816849 [ RunTime:0.007313s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.002907s ]
  11. SELECT * FROM `article` WHERE `id` < 816849 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000596s ]
  12. SELECT * FROM `article` WHERE `id` > 816849 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000441s ]
  13. SELECT * FROM `article` WHERE `id` < 816849 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002421s ]
  14. SELECT * FROM `article` WHERE `id` < 816849 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000822s ]
  15. SELECT * FROM `article` WHERE `id` < 816849 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.007201s ]
0.112717s