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解计算题时要因题而异,做好垫铺工作,形成简明思路。一、特殊值垫铺对于某些二组分混合物求比值(质量百分含量、物质的量百分含量、质量比、体积百分组成、物质的量之比、体积比等)题目,可先确定其中一组分为特殊值,再设另一组分为未知数,这样既可减少未知数,简化计算过程,又可获得简单明了的答案。例1 某氢氧化钠溶液中含氧80%,求该溶液的溶质质量分数。解析:这是一道由 NaOH和 H_2O 二种组分组成的混合物求比值问题。不妨设该 NaOH 溶液由1摩
When solving a calculation problem, it is necessary to vary according to the topic and do a good job of padding to form a concise way of thinking. First, the special value pad shop for certain two-component mixture ratio (mass percentage, the amount of material, mass ratio, volume percent composition, the ratio of the amount of the volume ratio, volume ratio, etc.), can be Determine that one group is divided into special values and another component is unknown. This reduces unknowns, simplifies the calculation process, and provides simple and straightforward answers. Example 1 The oxygen content in a certain sodium hydroxide solution was 80%. The solute mass fraction of the solution was determined. Analysis: This is a question of the mixture ratio of two components consisting of NaOH and H 2 O. May wish to set the NaOH solution by 1