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2026年高考贵州化学试卷14题解析

2026年高考贵州化学试卷14题解析

很多同学看到这道酸碱滴定图像题第一反应就是发懵:看不懂横坐标滴定分数T=×100%的含义,分不清HA、HB酸性强弱,缓冲溶液原理、质子守恒变形等式、电离常数Ka与滴定突跃的关联全混在一起。尤其是B选项带参数T的守恒式,绝大多数学生只会写常规物料、电荷守恒,不会结合滴定分数做变量代换;C、D选项关于Ka对滴定突跃、终点pH的影响,死记硬背结论很容易记反,经常把弱酸越弱、突跃越小这个核心规律弄颠倒,一步错整道题直接失分,是高三滴定图像题型里典型的易错题、拉分题。

2026年高考贵州化学试卷14题解析

2026年6月26日

第一部分原题呈现】

14. 25℃时,用0.1000mol·L-1NaOH溶液分别滴定0.1000mol·L-1一元酸HA和HB,滴定曲线(滴定分数T=×100%,T>100%后作简化处理)如图。下列说法错误的

A.曲线①在10%<T<90%内平缓,是因为A-和HA能共同稳定体系pH

B.滴定HA过程中存在关系:Tc(HA)+(T-1)c(A-)+c(H+)=c(OH-)

C.其他条件不变时,Ka越小,滴定终点附近pH突变范围越大

D.Ka越大,T=100%时溶液的pH越接近7

第二部分整体概述】

本题以等浓度NaOH滴定两种一元弱酸HA、HB为载体,创新引入滴定分数T作为横坐标,替代传统“NaOH溶液体积”,弱化机械读图,强化定量逻辑推导。起点pH:HA初始pH大于HB,说明酸性HB>HA,Ka(HB)>Ka(HA);T=100%为滴定终点,酸碱恰好完全中和生成NaA、NaB强碱弱酸盐,溶液显碱性;10%<T<90%区间同时存在弱酸与共轭碱,构成缓冲体系,pH变化平缓。题目四个选项分别从缓冲溶液原理、带参数守恒推导、电离常数与滴定突跃、Ka与盐溶液pH四个维度设问,层层递进,兼顾定性判断与定量推导。有下列考查特点:1.图像信息转化考查:陌生横坐标滴定分数T的概念理解,从曲线起点、缓冲区间、滴定终点提取酸性强弱、粒子共存状态信息。2.守恒变形定量推导:不直接给出常规电荷/物料守恒,要求结合T的定义联立等式,进行代数变形得到新型质子等式,突破固化守恒模板。3.电离平衡规律定性辨析:弱酸电离常数Ka、酸性强弱、盐类水解程度、pH滴定突跃范围多变量联动辨析,区分易混淆结论。4.综合逻辑判断:融合弱酸电离、缓冲溶液、盐类水解、酸碱滴定四大平衡模块,一道题整合多章节知识,综合判断正误,符合新高考“模块融合、重逻辑推导”的命题方式。

第三部分选项详解】

A选项:曲线①在10%<T<90%内平缓,是因为A-和HA能共同稳定体系pH

方法1:缓冲溶液定义法10%<T<90%时,加入NaOH仅中和部分HA,体系中同时存在大量弱酸HA与共轭碱A-,HA电离消耗OH-、A-水解消耗H+,外加少量酸碱时pH变化极小,属于缓冲溶液,曲线平缓,二者共同稳定体系的pH,所以A选项正确

方法2图像分析法对比起点(只有HA,pH陡升)、滴定终点附近(单一A-,pH突变),中间区间斜率极小,pH变化平缓,本质是弱酸-共轭碱缓冲对的缓冲作用,所以A选项正确。

B选项:滴定HA过程中存在关系:Tc(HA)+(T-1)c(A-)+c(H+)=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:n(Na+)=Tc0V0,n(HA)+n(A-)=c0V0,同除以总体积得:c(Na+)=T[c(HA)+c(A-)] ②,将②代入①:T[c(HA)+c(A-)]+c(H+)=c(A-)+c(OH-),移项可得:Tc(HA)+(T-1)c(A-)+c(H+)=c(OH-),所以B选项正确。

C选项:其他条件不变时,Ka越小,滴定终点附近pH突变范围越大

方法1:平衡逻辑推导Ka越小→弱酸酸性越弱→对应共轭碱水解程度越大。滴定终点前少量NaOH即可使pH大幅上升;滴定突跃是滴定终点前后pH急剧变化区间,酸性越弱(Ka越小),突跃范围越小,反之Ka越大突跃越宽,所以C选项错误

方法2:图像对比法曲线②HB起点pH更低,Ka(HB)更大,观察图像HB在T=100%附近pH突变区间宽度明显大于HA,直接证明Ka越小突跃越小,C描述相反,所以C选项错误

D选项:Ka越大,T=100%时溶液的pH越接近7

方法1:水解平衡推导T=100%溶质为NaX,X-+H2OHX+OH-,水解常数Kh=。Ka越大,Kh越小,X-水解程度越低,溶液中c(OH-)越小,碱性越弱,pH越接近中性7,所以D选项正确

方法2:图像对比法HB的Ka更大,T=100%时曲线②pH低于曲线①,更接近7,符合结论,所以D选项正确。

综上所述,C选项错误,为本题正确答案。

第四部分必备知识】

1.酸碱滴定基础:滴定分数T的定义、等浓度酸碱中和定量关系、滴定终点判断。

2.弱酸电离平衡:电离常数Ka与酸性强弱的对应关系、弱酸溶液pH计算规律。

3.缓冲溶液原理:弱酸及其共轭碱构成缓冲对,缓冲区间pH稳定的微观机理。

4.三大守恒定律:电荷守恒、物料守恒,结合滴定参数做代数变形推导质子等量关系。

5.盐类水解平衡:强碱弱酸盐水解规律、水解常数Kh=、水解程度与Ka的联动关系。

6.酸碱滴定突跃规律:弱酸电离常数对pH突变区间、滴定终点盐溶液pH的影响。

第五部分  复习启示

1.拒绝死记结论:滴定突跃、水解pH等规律必须结合平衡常数公式推导理解,避免记反“弱酸越弱突跃越小”这类核心结论。

2.强化定量计算推导训练:主动练习带参数、特殊值代入验证守恒等式,摆脱只会套现成守恒式的思维惰性。

3.建立图像分析流程:做题固定步骤——先看坐标定义→再读起点判断酸性→划分缓冲区间、滴定终点→结合平衡规律辨析选项。

4.主动整合模块知识:把电离、水解、滴定、缓冲溶液打通,形成统一平衡知识网络,避免知识点碎片化。

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:0.000626s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001033s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000305s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000276s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000492s ]
  6. SELECT * FROM `set` [ RunTime:0.000212s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000590s ]
  8. SELECT * FROM `article` WHERE `id` = 821339 LIMIT 1 [ RunTime:0.000468s ]
  9. UPDATE `article` SET `lasttime` = 1782850394 WHERE `id` = 821339 [ RunTime:0.002133s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000234s ]
  11. SELECT * FROM `article` WHERE `id` < 821339 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000583s ]
  12. SELECT * FROM `article` WHERE `id` > 821339 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000432s ]
  13. SELECT * FROM `article` WHERE `id` < 821339 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000854s ]
  14. SELECT * FROM `article` WHERE `id` < 821339 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001140s ]
  15. SELECT * FROM `article` WHERE `id` < 821339 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002354s ]
0.117416s