三价铁离子与硫离子反应的实验探究

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	英文篇名：Experimental Inquiry on the Reaction of Fe~(3+) and S~(2-) 作者：叶礼华 英文作者：YE Li-Hua;Chongqing Bashu Secondary School; 关键词：三价铁离子 ; 硫离子 ; 电极电势 ; 实验探究 英文关键词：ferric iron;;sulphur ion;;electrode potential;;experimental inquiry 中文刊名：FXJJ 英文刊名：Chinese Journal of Chemical Education 机构：重庆巴蜀中学; 出版日期：2019-01-02 出版单位：化学教育(中英文) 年：2019 期：v.40 语种：中文; 页：FXJJ201901019 页数：4 CN：01 ISSN：10-1515/O6 分类号：76-79

摘要

探究了水溶液中Fe~(3+)与S~(2-)的反应,得出几点结论:生成Fe2S3的沉淀反应是动力学优势反应,生成Fe2+和S的氧化还原反应是热力学优势反应;发现Fe2S3可以与Fe~(3+)反应生成S和Fe2+,Fe2S3在酸性条件下不稳定;在弱碱性条件下,Fe~(3+)也有与HS-发生氧化还原反应的倾向;Fe~(3+)在水溶液中主要以水解产物[Fe(H2O)6-n(OH)n](3-n)+(n=1,2)存在,[Fe(H2O)6-n(OH)n](3-n)+的氧化性很弱,难以将H2S或HS-氧化,却易与S~(2-)结合生成Ksp极小的Fe2S3沉淀。
        This paper inquired the reaction between Fe~(3+)and S~(2-)in aqueous solution,and obtained some conclusions:The precipitation of Fe2 S3 formed was considered to be kinetically controlled,While S and Fe2+as the oxidation-reduction reaction products were thermodynamically controlled;Fe2 S3 could react with Fe~(3+)to generate S and Fe2+,and Fe2 S3 was unstable under acidic condition;Fe~(3+)tended to react with HS-under weak basic condition;[Fe(H2 O)6-n(OH)n](3-n)+(n=1,2)was the main hydrolysis product of Fe~(3+)in aqueous solution,and its oxidability was very weak,so it was hard to oxidize H2 S and HS-,but it was easy to react with S~(2-)to generate Fe2 S3 precipitation with small Kspvalue.

引文

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