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【真题研究】2026年高考化学 新宠I-→I3-

【真题研究】2026年高考化学 新宠I-→I3-

2025高考化学考前抢分最后一课:(送95页课件PPT)

【合集】18省市高考真题逐题解析(课件PPT+原卷精编word版+解析word版)

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2026年高考新宠I-→I3-

研究真题

2026北京14已知I2在如下平衡:I2(H2O)I2(CCl4)KI2+II3-  K2。研究I2H2OCCl4KI水溶液中的溶解性,实验如下。

资料:依据Na2S2O3I2的反应,以淀粉为指示剂,用Na2S2O3标准溶液可准确测定水溶液中I2的浓度。下列说法不正确的是

A. a→b的现象符合相似相溶原理,可知K1>1

B. 三支试管中,c[I2(H2O)]的大小顺序:a>c>b

C. a→b中,若增加CCl4的体积,则c[I2(CCl4)]一定减小

D. cc[I2(CCl4)]:取c的下层溶液,加入KI水溶液后,依据资料方法测定

【答案】B

【解析】

a→b大部分I2(非极性分子)进入CCl4层;平衡的平衡常数c[I2(CCl4)]c[I2(H2O)],故K1>1A正确; 

Ba为饱和碘水,水层总I2浓度最大;a→b加入CCl4后,大量I2转移到有机层,水层游离I2浓度大幅降低,因此c[I2(H2O)]a>b;向b中滴入KI水溶液,发生平衡I2+II3-,消耗水层游离I2,促使平衡逆向移动,有机层的I2向水层转移,c[I2(CCl4)]减小,而为了维持不变,c[I2(H2O)]也要减小,故c[I2(H2O)]b>c因此三者顺序应为a>b>cB错误; 

C.平衡的平衡常数K1仅随温度变化,温度不变时K1为定值。增加CCl4体积,更多I2会从水层进入有机层,但水层游离I2浓度因体系稀释、平衡移动持续降低,由c[I2(CCl4)]=K1×c[I2(H2O)]可知,有机层I2浓度一定减小,C正确; 

D.取c的下层CCl4溶液,加入KI水溶液后振荡,I2I反应生成I3-完全进入水层,用Na2S2O3标准溶液滴定水层的I2(滴定过程中I3-会不断分解出I2参与反应),可测定I2总物质的量,进而计算c[I2(CCl4)]D正确;

故选B

2026河北1425℃下,在0.1mol/LKI溶液中加入一定量I₂(s),达平衡时,溶液中)pH的关系如图所示(溶液体积变化忽略不计)

已知:pH<8.73时,体系中有I2(s)存在;

.溶液中存在I2(aq)+II3-

下列说法正确的是

A.反应的平衡常数

B.溶液中始终有c(I⁻) > c(I3),且pH>8.73时,c(I3)/c(I⁻的值随pH增大而减小

C.若在平衡体系中加入少量I2(s)IO3-I3-的平衡浓度均增大

D.若改变KI溶液的初始浓度,相同pH下达平衡时,c5(I-)×c(IO3-)的值不变

【答案】B

【解析】

读图:1pH<8.73时,体系中有I₂(s)存在,说明溶液中的I₂处于饱和状态,其浓度保持恒定。溶液中存在两个平衡:I₂(s) + I⁻ ⇌ I₃⁻I₃⁻ + 2I⁻ ⇌ I₅⁻

【易错点】

容易忽视pH<8.73I₂(s)存在表示I₂浓度恒定,加入固体I₂不改变平衡;也可能对多重平衡体系中浓度比值的变化分析不清。

2026河难16定性探究:利用如图装置进行实验。

I.向饱和碘水中加入,充分振荡、静置、分液。取少量水溶液,向其中滴加淀粉溶液,溶液变蓝。

.向饱和的溶液中加入蒸馏水,充分振荡、静置、分液。取少量水溶液,向其中滴加淀粉溶液,溶液变蓝。

仪器a的名称是___________b的名称是___________

振荡、静置后,溶液在下层的原因是___________

步骤中,证明从水中转移至中的现象是___________

结论:浓度商的值近似相等,平衡时浓度商可视为常数。

步骤中,加入KI的目的是___________

通过步骤测得的浓度商的值为___________(写出计算式)

已知常温下,平衡时浓度商的值为85。向150 mL3.0×10-2g I2的水溶液中加入进行萃取,平衡时在水中的残留质量为___________(用科学计数法表示,保留小数点后一位);若改为分两次萃取,每次用150mLCCl4,两次萃取后在水中的残留质量为3.3×10-4 g。上述结果对做萃取实验的启发是___________

分析:实验I验证了碘从水层(加CCl₄后颜色变浅)转移到CCl₄层(紫红色)。实验反向验证了碘也能从CCl₄层转移到水层(水层加淀粉变蓝)。综合结论:I₂在两相间存在可逆分配。

定量部分:利用Na₂S₂O₃标准溶液滴定测定水层和CCl₄层中的I₂含量。步骤中加入过量KI使CCl₄层中I₂转化为水溶性的I₃⁻I₂+I⁻⇌I₃⁻),从而可用水溶液滴定法测定。

SIKAO

思考

数据解读

教材原型

考题形式

共同的考查能力维度

1. 平衡常数 K 的灵活运用

2. 多重平衡的耦合分析

三道题都不是单一平衡,而是2-3个平衡相互影响(如北京题中平衡①与②的联动,河北题中pH变化引发I₂歧化与I₃⁻的转换)

3. 实验探究与定量计算

河南题完整呈现了"定性发现定量验证规律应用"的探究链条北京题和河北题虽以选择题形式呈现,但都基于实验图像或数据推导

4. 数据与图像的信息提取能力

河北题给 c-pH关系图,要求从图中读取关键点的浓度数据北京题给出实验现象描述,要求结合平衡原理推理

结论:教学中紧跟教材,进行变式拓展

 免责声明 本公众号部分内容转载自网络,本号特尊重原创,版权归原作者所有。本号志在为更多老师、学生及家长提供学习交流平台,转发文章不代表平台立场。如有侵权请联系我们(微信号LZT760212)

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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:0.000648s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000328s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000277s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000463s ]
  6. SELECT * FROM `set` [ RunTime:0.000203s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000588s ]
  8. SELECT * FROM `article` WHERE `id` = 913619 LIMIT 1 [ RunTime:0.000868s ]
  9. UPDATE `article` SET `lasttime` = 1786155763 WHERE `id` = 913619 [ RunTime:0.009043s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000214s ]
  11. SELECT * FROM `article` WHERE `id` < 913619 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000443s ]
  12. SELECT * FROM `article` WHERE `id` > 913619 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000503s ]
  13. SELECT * FROM `article` WHERE `id` < 913619 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000893s ]
  14. SELECT * FROM `article` WHERE `id` < 913619 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004677s ]
  15. SELECT * FROM `article` WHERE `id` < 913619 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001187s ]
0.099704s