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一、问题的提出电解CuCl_2溶液,溶液呈何性?对此,有两种不同看法。理论派认为:由于Cu~(2+)水解,Cu~(2+)+2H_2O■Cu(OH)_2+2H~+,CuCl_2溶液显酸性。用惰性电极电解CuCl_2溶液时,在阴极上Cu~(2+)放电,Cu~(2+)+2e~-=Cu;在阳极上Cl~-放电产物是Cl_2,2Cl~--2e~-=Cl_2↑;电解反应方程式是CuCl_2(?)Cu+Cl_2↑,由于Cl_2逸出,CuCl_2被电解,所以,随着Cu~(2+)浓度的降低,溶液pH升高并最终趋向7。
First, the question put forward Electrolytic CuCl 2 solution, what is the solution? To this, there are two different views. Theorists believe that due to Cu ~ (2+) hydrolysis, Cu ~ (2 +) + 2H_2O ■ Cu (OH) _2 + 2H ~ +, CuCl_2 solution is acidic. When CuCl 2 was electrolyzed by an inert electrode, Cu 2+ was discharged on the cathode, Cu 2+ + 2e- - = Cu. The Cl ~ - discharge product on the anode was Cl_2,2Cl ~ - 2e ~ = Cl_2 ↑. The electrolysis reaction equation is CuCl_2 (?) Cu + Cl_2 ↑. As Cl_2 escapes, CuCl_2 is electrolyzed. Therefore, with the decrease of Cu 2+ concentration, the pH of the solution increases and eventually reaches 7.