论文部分内容阅读
中学化学中有很多规律,掌握好这些规律能使我们学生的学习事半功倍.同样,教师在教学中随时注重对规律的总结和应用,也会优化教学效果.在这篇文章中,笔者重点总结一下“强制弱”:1较强酸制较弱酸1)酸性由强到弱顺序为HCl、H2CO3、HClO:CaCO3+2HCl=CaCl2+CO2↑+H2O,Ca(ClO)2+CO2+H2O=CaCO3+2HClO.2)酸性由强到弱顺序为H2CO3、H2SiO3:Na2SiO3+CO2+H2O=Na2CO3+H2SiO3.
There are many laws in secondary chemistry, master these rules can make our students learn more with less. Similarly, teachers in the teaching at any time pay attention to the law of summary and application, will also optimize the teaching effect.In this article, the author summarizes “Forced weak ”: 1 Weak acid Weaker acid 1) From strong to weak acid, the order of HCl, H2CO3, HClO: CaCO3 + 2HCl = CaCl2 + CO2 ↑ + H2O, Ca (ClO) 2 + CO2 + H2O = CaCO3 + 2HClO.2) The order of the acidity from strong to weak is H2CO3, H2SiO3: Na2SiO3 + CO2 + H2O = Na2CO3 + H2SiO3.