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原题:准确称取6克铝土矿样品(含Al_2O_3、Fe_2O_3、SiO_2),放入盛100毫升某浓度的H_2SO_4溶液的烧杯中,充分反应后过滤,向滤液中加入10摩/升的NaOH溶液,产生沉淀的质量与加入NaOH溶液的体积关系如图。
The original title: Accurately weigh 6 g of bauxite sample (containing Al2O3, Fe2O3, SiO2) into a beaker containing 100 ml of H2SO4 solution. After adequate reaction, filter and add 10 mol/l of NaOH to the filtrate. The relationship between the mass of the resulting solution and the volume of NaOH solution added is shown in the figure.