论文部分内容阅读
解讨论型天平平衡题有没有既准确又快捷的方法?回答是肯定的,只要把握住天平平衡的本质——溶液的增重量相等,据此分三个阶段展开讨论。 [例题一]两个烧杯分别放在天平的两个托盘上,左侧烧杯放入含HCllmo1的盐酸,右侧烧杯放入含NaOHlmol的氢氧化钠溶液,天平平衡。然后向左侧烧杯中放入A克镁粉,右侧烧杯中放入B克铝粉,最终天平仍保持平衡。试求A和B的关系和取值范围。
Is there an accurate and quick way to solve the balance question? The answer is yes, as long as you grasp the essence of the balance - the equal weight gain of the solution, according to which the discussion begins in three stages. [Example 1] Two beakers are placed on the two trays of the balance. The left beaker is placed in hydrochloric acid containing HCl1mo1, and the right beaker is placed in NaOH1mol sodium hydroxide solution. The balance is balanced. Then add A g of magnesium powder to the left beaker and B g of aluminum powder to the right beaker. The final balance is still balanced. Try to find the relationship between A and B and the range of values.