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题目(2005年理综能力测试第28题):已知某纯碱试样中含有NaCl杂质,为测定试样中纯碱的质量分数,可用图1中的装置进行实验.
Title (28th question of the 2005 Synthetic Ability Test): It is known that a soda ash sample contains NaCl impurities. To determine the mass fraction of soda ash in the sample, the device in Figure 1 can be used for experiments.