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必修一化学离子反应方程式大全(文末有文档下载链接,建议打印默写)

  • 2026-09-28 19:22:25
必修一化学离子反应方程式大全(文末有文档下载链接,建议打印默写)

一、离子方程式书写规则

1. 拆分原则

· 能拆:强酸(HCl、H₂SO₄、HNO₃)、强碱(NaOH、KOH、Ba(OH)₂)、可溶性盐、HSO₄⁻(稀溶液中可拆为H⁺ + SO₄²⁻)。
· 不能拆:弱酸(CH₃COOH、H₂CO₃、HClO)、弱碱(NH₃·H₂O)、水、沉淀、气体、氧化物、单质。
· HCO₃⁻、HS⁻、HSO₃⁻不能拆。
· 微溶物作反应物且为溶液时拆,作生成物时写化学式。

2. 检查清单

· 两边电荷是否守恒;原子是否守恒;拆分是否正确;是否符合客观事实。

二、钠及其化合物

2Na + 2H₂O = 2Na⁺ + 2OH⁻ + H₂↑
2Na + 2H⁺ = 2Na⁺ + H₂↑
2Na + 2H₂O + Cu²⁺ = Cu(OH)₂↓ + H₂↑ + 2Na⁺
Na₂O + H₂O = 2Na⁺ + 2OH⁻
Na₂O + 2H⁺ = 2Na⁺ + H₂O
2Na₂O₂ + 2H₂O = 4Na⁺ + 4OH⁻ + O₂↑
2Na₂O₂ + 4H⁺ = 4Na⁺ + 2H₂O + O₂↑
NaHCO₃ + HCl:HCO₃⁻ + H⁺ = CO₂↑ + H₂O
Na₂CO₃ + 少量HCl:CO₃²⁻ + H⁺ = HCO₃⁻
Na₂CO₃ + 足量HCl:CO₃²⁻ + 2H⁺ = CO₂↑ + H₂O
NaHCO₃ + NaOH:HCO₃⁻ + OH⁻ = CO₃²⁻ + H₂O
Na₂CO₃ + CO₂ + H₂O:CO₃²⁻ + CO₂ + H₂O = 2HCO₃⁻
Na₂CO₃ + Ca(OH)₂:Ca²⁺ + CO₃²⁻ = CaCO₃↓
Na₂CO₃ + BaCl₂:Ba²⁺ + CO₃²⁻ = BaCO₃↓
Na₂SO₄ + BaCl₂:Ba²⁺ + SO₄²⁻ = BaSO₄↓

三、氯及其化合物

Cl₂ + H₂O ⇌ H⁺ + Cl⁻ + HClO
Cl₂ + 2OH⁻ = Cl⁻ + ClO⁻ + H₂O
HClO + OH⁻ = ClO⁻ + H₂O
ClO⁻ + H⁺ = HClO
Cl₂ + 2I⁻ = 2Cl⁻ + I₂
Cl₂ + 2Br⁻ = 2Cl⁻ + Br₂
Cl₂ + 2Fe²⁺ = 2Cl⁻ + 2Fe³⁺
Cl₂ + S²⁻ = S↓ + 2Cl⁻
Cl₂ + H₂S = S↓ + 2H⁺ + 2Cl⁻
HCl + AgNO₃:Ag⁺ + Cl⁻ = AgCl↓
NaCl + AgNO₃:Ag⁺ + Cl⁻ = AgCl↓
漂白液制备:Cl₂ + 2OH⁻ = Cl⁻ + ClO⁻ + H₂O

四、铁及其化合物

Fe + 2H⁺ = Fe²⁺ + H₂↑
Fe + Cu²⁺ = Fe²⁺ + Cu
Fe + 2Ag⁺ = Fe²⁺ + 2Ag
2Fe³⁺ + Fe = 3Fe²⁺
2Fe³⁺ + Cu = 2Fe²⁺ + Cu²⁺
2Fe²⁺ + Cl₂ = 2Fe³⁺ + 2Cl⁻
2Fe³⁺ + 2I⁻ = 2Fe²⁺ + I₂
Fe₂O₃ + 6H⁺ = 2Fe³⁺ + 3H₂O
FeO + 2H⁺ = Fe²⁺ + H₂O
Fe₃O₄ + 8H⁺ = Fe²⁺ + 2Fe³⁺ + 4H₂O
Fe(OH)₃ + 3H⁺ = Fe³⁺ + 3H₂O
Fe(OH)₂ + 2H⁺ = Fe²⁺ + 2H₂O
Fe³⁺ + 3OH⁻ = Fe(OH)₃↓
Fe²⁺ + 2OH⁻ = Fe(OH)₂↓
Fe³⁺ + 3SCN⁻ = Fe(SCN)₃(血红色,检验Fe³⁺)

五、铝及其化合物(★最新教材修订重点)

重要说明:水溶液中铝与碱反应的产物是四羟基合铝酸根 [Al(OH)₄]⁻,旧写法“AlO₂⁻”已淘汰。高温熔融/固态条件下(如Al₂O₃与Na₂CO₃高温煅烧)产物仍写偏铝酸盐(MAlO₂),本大全只涉及水溶液体系。
2Al + 6H⁺ = 2Al³⁺ + 3H₂↑
2Al + 2OH⁻ + 6H₂O = 2[Al(OH)₄]⁻ + 3H₂↑(铝与NaOH溶液)
2Al + 3Cu²⁺ = 2Al³⁺ + 3Cu
Al + 3Ag⁺ = Al³⁺ + 3Ag
Al₂O₃ + 6H⁺ = 2Al³⁺ + 3H₂O
Al₂O₃ + 2OH⁻ + 3H₂O = 2[Al(OH)₄]⁻(氧化铝与NaOH溶液)
Al(OH)₃ + 3H⁺ = Al³⁺ + 3H₂O
Al(OH)₃ + OH⁻ = [Al(OH)₄]⁻(氢氧化铝与NaOH溶液)
Al³⁺ + 3NH₃·H₂O = Al(OH)₃↓ + 3NH₄⁺
Al³⁺ + 3OH⁻ = Al(OH)₃↓(NaOH少量)
Al³⁺ + 4OH⁻ = [Al(OH)₄]⁻(NaOH足量)
Al(OH)₄⁻ + H⁺ = Al(OH)₃↓ + H₂O(HCl少量)
Al(OH)₄⁻ + 4H⁺ = Al³⁺ + 4H₂O(HCl足量)
2[Al(OH)₄]⁻ + CO₂ = 2Al(OH)₃↓ + CO₃²⁻ + H₂O(CO₂少量)
Al(OH)₄⁻ + CO₂ = Al(OH)₃↓ + HCO₃⁻(CO₂足量)
Al³⁺ + 3[Al(OH)₄]⁻ = 4Al(OH)₃↓
Al³⁺ + 3HCO₃⁻ = Al(OH)₃↓ + 3CO₂↑
分步机理(帮助理解):铝先与水反应生成Al(OH)₃和H₂,NaOH再溶解Al(OH)₃生成[Al(OH)₄]⁻。

六、铜及其化合物

  1. Cu + 2Ag⁺ = Cu²⁺ + 2Ag
  2. Cu + 2Fe³⁺ = Cu²⁺ + 2Fe²⁺
  3. CuO + 2H⁺ = Cu²⁺ + H₂O
  4. Cu(OH)₂ + 2H⁺ = Cu²⁺ + 2H₂O
  5. Cu²⁺ + 2OH⁻ = Cu(OH)₂↓
  6. Cu²⁺ + SO₄²⁻ + Ba²⁺ + 2OH⁻ = Cu(OH)₂↓ + BaSO₄↓

七、酸碱中和与复分解

(一)酸碱中和

  1. 强酸 + 强碱:H⁺ + OH⁻ = H₂O
  2. 醋酸 + NaOH:CH₃COOH + OH⁻ = CH₃COO⁻ + H₂O
  3. 氨水 + 盐酸:NH₃·H₂O + H⁺ = NH₄⁺ + H₂O
  4. 稀硫酸 + Ba(OH)₂:Ba²⁺ + 2OH⁻ + 2H⁺ + SO₄²⁻ = BaSO₄↓ + 2H₂O

(二)酸与盐

  1. CaCO₃ + 盐酸:CaCO₃ + 2H⁺ = Ca²⁺ + CO₂↑ + H₂O
  2. NaHCO₃ + 盐酸:HCO₃⁻ + H⁺ = CO₂↑ + H₂O
  3. Na₂CO₃ + 少量盐酸:CO₃²⁻ + H⁺ = HCO₃⁻
  4. Na₂CO₃ + 足量盐酸:CO₃²⁻ + 2H⁺ = CO₂↑ + H₂O
  5. CH₃COONa + 盐酸:CH₃COO⁻ + H⁺ = CH₃COOH
  6. NaClO + 盐酸:ClO⁻ + H⁺ = HClO

(三)碱与盐

  1. MgCl₂ + NaOH:Mg²⁺ + 2OH⁻ = Mg(OH)₂↓
  2. FeCl₃ + NaOH:Fe³⁺ + 3OH⁻ = Fe(OH)₃↓
  3. CuSO₄ + NaOH:Cu²⁺ + 2OH⁻ = Cu(OH)₂↓
  4. NH₄Cl + 稀NaOH:NH₄⁺ + OH⁻ = NH₃·H₂O
  5. NH₄Cl + 浓NaOH(Δ):NH₄⁺ + OH⁻ = NH₃↑ + H₂O
  6. FeCl₃ + 氨水:Fe³⁺ + 3NH₃·H₂O = Fe(OH)₃↓ + 3NH₄⁺
  7. AlCl₃ + 氨水:Al³⁺ + 3NH₃·H₂O = Al(OH)₃↓ + 3NH₄⁺

八、与量有关专题(重点)

书写总原则:“以少定多” ——将少量物质定为1 mol,按其离子组成比例确定过量物质中实际参加反应的离子数目。若化学计量数为分数,调整为整数。

1. CO₂通入NaOH

· 少量CO₂:CO₂ + 2OH⁻ = CO₃²⁻ + H₂O
· 过量CO₂:CO₂ + OH⁻ = HCO₃⁻

2. CO₂通入Ca(OH)₂

· 少量CO₂:Ca²⁺ + 2OH⁻ + CO₂ = CaCO₃↓ + H₂O
· 过量CO₂:OH⁻ + CO₂ = HCO₃⁻

3. Na₂CO₃与盐酸

· 少量盐酸:CO₃²⁻ + H⁺ = HCO₃⁻
· 足量盐酸:CO₃²⁻ + 2H⁺ = CO₂↑ + H₂O

4. NaHCO₃与Ca(OH)₂

· Ca(OH)₂少量:Ca²⁺ + 2OH⁻ + 2HCO₃⁻ = CaCO₃↓ + CO₃²⁻ + 2H₂O
· Ca(OH)₂足量:Ca²⁺ + OH⁻ + HCO₃⁻ = CaCO₃↓ + H₂O

5. Ca(HCO₃)₂与NaOH

· NaOH少量:Ca²⁺ + HCO₃⁻ + OH⁻ = CaCO₃↓ + H₂O
· NaOH足量:Ca²⁺ + 2HCO₃⁻ + 2OH⁻ = CaCO₃↓ + CO₃²⁻ + 2H₂O

6. Ba(OH)₂与NaHSO₄

· NaHSO₄少量:Ba²⁺ + OH⁻ + H⁺ + SO₄²⁻ = BaSO₄↓ + H₂O
· NaHSO₄足量:Ba²⁺ + 2OH⁻ + 2H⁺ + SO₄²⁻ = BaSO₄↓ + 2H₂O

7. NH₄HSO₄与NaOH

· NaOH少量:H⁺ + OH⁻ = H₂O
· NaOH足量:H⁺ + NH₄⁺ + 2OH⁻ = NH₃·H₂O + H₂O

8. AlCl₃与NaOH

· NaOH少量:Al³⁺ + 3OH⁻ = Al(OH)₃↓
· NaOH足量:Al³⁺ + 4OH⁻ = [Al(OH)₄]⁻

9. Na[Al(OH)₄](旧称NaAlO₂)与CO₂

· CO₂少量:2[Al(OH)₄]⁻ + CO₂ = 2Al(OH)₃↓ + CO₃²⁻ + H₂O
· CO₂足量:[Al(OH)₄]⁻ + CO₂ = Al(OH)₃↓ + HCO₃⁻

10. Na[Al(OH)₄]与HCl

· HCl少量:[Al(OH)₄]⁻ + H⁺ = Al(OH)₃↓ + H₂O
· HCl足量:[Al(OH)₄]⁻ + 4H⁺ = Al³⁺ + 4H₂O

11. FeBr₂与Cl₂

· 少量Cl₂:2Fe²⁺ + Cl₂ = 2Fe³⁺ + 2Cl⁻
· 足量Cl₂:2Fe²⁺ + 4Br⁻ + 3Cl₂ = 2Fe³⁺ + 2Br₂ + 6Cl⁻

九、高频易错点

Fe与稀盐酸、稀硫酸反应生成Fe²⁺,不是Fe³⁺。
Na与盐溶液反应,先与水反应,不能直接置换盐中金属。
Al(OH)₃只溶于强酸、强碱,不溶于氨水。
HSO₄⁻可拆,HCO₃⁻不能拆。
微溶物作生成物写化学式。
与量有关反应:谁少量,按谁配比写(“以少定多”)。
水溶液中铝与碱反应产物写[Al(OH)₄]⁻;高温熔融/固态条件下仍写AlO₂⁻(如Na₂CO₃与Al₂O₃高温煅烧)。
浓硫酸与固体NaCl制HCl气体,不在水溶液中进行,不写离子方程式。
电荷守恒检查:书写后务必确认两边电荷总数相等。

附录:常见拆与不拆

· 能拆:HCl、H₂SO₄、HNO₃、NaOH、KOH、Ba(OH)₂、可溶性盐、HSO₄⁻(稀溶液中)
· 不能拆:CH₃COOH、H₂CO₃、HClO、NH₃·H₂O、H₂O、CaCO₃、BaSO₄、AgCl、Fe(OH)₃、CO₂、SO₂、NH₃、Na₂O、Na₂O₂、CuO、Fe₂O₃、Na、Fe、Cu、Cl₂、HCO₃⁻、HS⁻、HSO₃⁻
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  1. CONNECT:[ UseTime:0.000660s ] mysql:host=172.18.0.4;port=3306;dbname=no_yeyulingfeng;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000721s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000420s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000415s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000518s ]
  6. SELECT * FROM `set` [ RunTime:0.000267s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000680s ]
  8. SELECT * FROM `article` WHERE `id` = 492628 LIMIT 1 [ RunTime:0.000380s ]
  9. UPDATE `article` SET `lasttime` = 1790646475 WHERE `id` = 492628 [ RunTime:0.004006s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 460 LIMIT 1 [ RunTime:0.000391s ]
  11. SELECT * FROM `article` WHERE `id` < 492628 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000390s ]
  12. SELECT * FROM `article` WHERE `id` > 492628 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000383s ]
  13. SELECT * FROM `article` WHERE `id` < 492628 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000522s ]
  14. SELECT * FROM `article` WHERE `id` < 492628 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000479s ]
  15. SELECT * FROM `article` WHERE `id` < 492628 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000702s ]
0.097083s