准确称取0.4000 g硅酸盐试样,经碱熔、浸取、凝聚、过滤、灼烧得含杂质的SiO2 0.2800 g,再经HF-H2SO4处理后,称得残渣量0.0018 g。则试样中SiO2的质量分数为()
准确称取0.4000 g硅酸盐试样,经碱熔、浸取、凝聚、过滤、灼烧得含杂质的SiO2 0.2800 g,再经HF-H2SO4处理后,称得残渣量0.0018 g。则试样中SiO2的质量分数为()
A.32.45%
B.70.00%
C.0.45%
D.69.55%
正确答案:70.00%
准确称取0.4000 g硅酸盐试样,经碱熔、浸取、凝聚、过滤、灼烧得含杂质的SiO2 0.2800 g,再经HF-H2SO4处理后,称得残渣量0.0018 g。则试样中SiO2的质量分数为()
A.32.45%
B.70.00%
C.0.45%
D.69.55%
正确答案:70.00%
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