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为了使解题过程更简捷明快,可以针对已知条件另行拟制解题条件,然后借助虚拟条件巧求结果。1.虚拟数据根据题中特定条件假设有助于解题的数据,使之与已知条件之间建立直接而简捷的换算关系。例1 已知,将某 KHCO_3的水溶液(密度为1.13g/cm~3)加热之后(设 KHCO_3全部分解),制得了13.8％的 K_2CO_3溶液,假设加热时,溶液水分没有蒸发,CO_2全部逸出,试求原 KHCO_3溶液的百分比浓度和物质的量浓度。
In order to make the problem-solving process simpler and quicker, the conditions for solving the problem may be separately prepared for the known conditions, and then the results may be meticulously obtained through virtual conditions. 1. The virtual data is based on the hypothesis that the specific conditions in the problem contribute to the problem solving data, and establish a direct and simple conversion relationship with the known conditions. Example 1 It is known that after a KHCO 3 aqueous solution (with a density of 1.13g/cm 3) is heated (all KHCO 3 is decomposed), a 13.8% K 2 CO 3 solution is prepared. Assuming that the solution moisture does not evaporate during heating, all CO 2 evolves. , Try to find the percentage concentration of the original KHCO_3 solution and the concentration of the substance.