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守恒法是定量分析化学问题的一种重要思想方法,它是利用物质的某种量值(如质量、原子数目、能量等)在变化前后(总量)保持不变或相对立的两个量值(如正负电荷、电子得失等)相等,建立代数方程(组)后进行分析、计算的一种方法。在求解化学问题时,如果我们能够充分地利用守恒关系,常常可以使解题过程优化,提高思维的敏捷性,收到事半功倍的效果。一、应用质量守恒解题例1把7.4 g Na_2CO_3·10H_2O与NaHCO_3的混合物溶于水,配成100 mL溶液,测得c(Na~+)=0.6 mol·mL~(-1),若将等质
Conservative law is an important way to quantitatively analyze chemical problems. It is to use two quantities of substances (such as mass, number of atoms, energy, etc.) that remain unchanged or opposite before or after the change (Such as positive and negative charge, electronic gains and losses, etc.) equal to establish algebraic equations (group) analysis, calculation of a method. In solving chemical problems, if we can make full use of the conservation relationship, we can often make the process of solving problems more optimized, improve the agility of thinking, and get a multiplier effect. First, the application of mass conservation solution Example 1 7.4 g Na_2CO_3 · 10H_2O and NaHCO_3 mixture was dissolved in water, dubbed 100 mL solution, measured c (Na ~) = 0.6 mol · mL -1, if the Etc.