镀锌溶液里的几种阳离子(Zn~(++)、H~+等),通电以后哪个首先得到电子?从标准电极电位来看,H~+应首先接受电子变为中性氢原子,在阴极析出氢气。但电镀时阴极析出的是锌而不是氢,这是为什么?这种疑问,学生也常凭其熟悉的金属活动顺序表提出。所以解决这个问题,对于中学教学亦有必要。为此,不妨先对标准电极电位做个回 Several cations (Zn~(++), H~+, etc.) in the galvanizing solution, which first get electrons after electrification? From the standard electrode potential point of view, H~+ should first accept electrons to become neutral hydrogen atoms, Hydrogen gas evolved at the cathode. However, when electroplating, the cathode is precipitated with zinc instead of hydrogen. Why? This question is often raised by students on the familiar metal activity schedule. So solving this problem is also necessary for secondary school teaching. For this reason, it may be necessary to first make a standard electrode potential