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一、题例:2014年北京高考题理综28题(15分)用FeC l3酸性溶液脱除H2S后的废液,通过控制电压电解得以再生。某同学使用石墨电极,在不同电压(x)下电解PH=1的0.1mol/L的FeC l2溶液,研究废液再生机理。记录如下(a、b、c代表电压数值):(1)用KSCN检验出Fe~(3+)的现象是__。(2)Ⅰ中,Fe~(3+)产生的原因可能是Cl~-在阳极放电,生成的Cl_2将Fe~(2+)氧化。写出有关反应:__。
First, the title: 2014 Beijing college entrance examination questions 28 questions (15 points) FeC l3 acid solution after the removal of H2S waste, by controlling the voltage electrolysis to be regenerated. A classmate used graphite electrode to electrolyze 0.1mol / L FeCl 2 solution with pH = 1 under different voltage (x) to study the mechanism of waste liquid regeneration. Record as follows (a, b, c on behalf of the voltage value): (1) KSCN test Fe ~ (3 +) phenomenon is __. (2) Ⅰ, Fe ~ (3+) may be caused by the Cl ~ - discharge at the anode, and the generated Cl_2 will oxidize Fe ~ (2+). Write about the reaction: __.