分析化学
魅力星光
第1楼2009/12/03
钠熔溶液,用稀硝酸酸化,在通风橱里加热煮沸除去HCN和H2S(若试样中不含氮和硫,则不需煮沸),放冷后,滴加AgNO3溶液,如有沉淀生成,则表示有卤素存在。
sartre
第2楼2009/12/03
没学过这个。。。
rogerxu216
第3楼2009/12/07
Sulphuride S-2, which is often contain in samples, is oxidzed by HNO3 and reduce to sulphur S0, which shows the white ppt. just filter to get rid of them and they don''t affect the result.
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