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用性电极电解电解质溶液,由于电解质在组成上种类繁多,电解质溶液中的阴阳离子在两极上放电情况也复杂,在教学方面,是一大难点。在电解过程中,有的因水电离出的H~+或OH~-参加了电极反应,使溶液中H~+浓度和OH~-浓度发生了变化,电解后引起溶液性质的变化;有的H~+和OH~-参加了电极反应,电解的结果,H~+浓度和OH~-浓度没有发生变化,因而溶液的酸碱性没有变化;有的仅是电解质电离出的阴阳离子参加了电极反应,而水电离出的H~+或OH~-没有参加电极反应,但也引起溶液中H~+浓度和OH~-浓度的变化,从而引起
Electrolytic electrolyte solution with the use of electrodes, due to the variety of electrolytes in the composition of the electrolyte solution in the anion and cation discharge on the two poles is also complicated, in terms of teaching, is a major difficulty. In the electrolysis process, some of the H~+ or OH~ ions ionized by the water participate in the electrode reaction, so that the H~+ concentration and the OH~~ concentration in the solution are changed, and the electrolysis causes changes in the solution properties; H~+ and OH~- participated in the electrode reaction. As a result of the electrolysis, the concentrations of H~+ and OH~ did not change, so the acidity and alkalinity of the solution did not change; only the anions and cations ionized by the electrolytes participated. The electrode reaction, and H+ or OH~ ionized by water does not participate in the electrode reaction, but it also causes changes in the concentration of H~+ and OH~- in the solution, causing