chapter6coulometry(編輯修改稿)
2024-11-29 17:59 本頁面
【文章內(nèi)容簡介】 Cu2+分離 控制電位電解法 實際分析中，工作電極（通常為陰極）的電位是隨著電解過程的進(jìn)行而不斷變化的，而且陽極電位及電解電流也是可變的。因此，憑借控制外加電壓來控制陰極電位，從而進(jìn)行分離存在一定的困難。通常通過下列裝置來控制陰極電位。 Potentio meter Electromagic stirrer Reference electrode 167。 63 Controlled Potential Coulometry Coulometer Potentiometer Apparatus setup of controlled potential coulometry is the same as controlled potential electrolysis. Because coulombic analysis is carried out by determining the coulomb passing an electrolytic cell during electrolyzing, an serieswound (串聯(lián)） accurate coulometer is necessary. Coulometer (庫侖計） ■ Silver Coulometer (weight Coulometer) Netty Pt cathode Pt wire anode AgNO3 solution On cathode: Ag+ + e → Ag On anode: 2H2O 4e→O 2 + 4H+ 庫侖計本身也是一種電解電池，可以應(yīng)用不同的電解反應(yīng)來構(gòu)成。 ● Titration Coulometer ● Gas Coulometer (hydrogenoxygen Coulometer) 1 2 , 2. electrodes Electrolysis solution: K2SO4 or Na2SO4 Cathode: 2H2O +2e→2OH +H2 Anode: 4OH +e→O 2 + 2H2O of mixed gas of H2 and O2 is ob
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