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一、函数图像型化学计算[例1](2008年山东临沂)刘明用石灰石(杂质不与酸反应,也不溶于水)和稀盐酸反应制取二氧化碳,在准备将反应后的废液倒进废液缸时,发现实验桌上有一瓶未知质量分数的Na_2CO_3溶液,他决定利用该废液,测定Na_2CO_3溶液中溶质的质量分数。他将废液过滤,然后向废液中慢慢滴加Na_2CO_3溶液,加入Na_2CO_3溶液的质量与生成沉淀质量的关系如下图所示。
First, the functional image chemical calculation [Example 1] (Linyi in Shandong in 2008) Liu Ming with limestone (impurities do not react with acid, do not dissolve in water) and dilute hydrochloric acid to produce carbon dioxide, in the preparation of the reaction after the waste pour Into the waste tank, it was found on the experimental table a bottle of unknown mass fraction of Na_2CO_3 solution, he decided to use the waste, determination of Na_2CO_3 solute mass fraction. He will waste liquid filtration, and then slowly to the waste solution of Na_2CO_3 solution, adding Na_2CO_3 solution quality and the relationship between the formation of precipitation as shown below.