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一、目的 运用氧化业铜在酸性溶液中生成的±1价铜离子发生歧化反应制岔金属铜溶胶。并观察胶体的相对稳定性。 二、原理 用醛类物质还原新制的Cu(OH)_2,可以生成红色的Cu_2O沉淀,再加入过量的酸,使Cu~+歧化生成Cu~(2+),和Cu,新生的细小晶体铜分散在溶液中,即形成黄绿色透明铜溶胶,具有十分显著的丁达尔现象。静置约半小时,溶胶有少量凝聚,产生黑色的粗颗粒铜沉淀,证明胶体分散系不如溶液分散系稳定。
I. Purpose The use of copper oxide in the oxidation industry in the acidic solution of ± 1 valence copper ion disproportionation reaction system to produce antimony metal copper sol. Observe the relative stability of the colloids. Second, the principle of using aldehydes to reduce the new Cu (OH) _2, can generate red Cu 2 O precipitate, and then add excess acid, so that Cu ~ + disproportionation to Cu 2+ , and Cu, the new small crystal copper Dispersed in the solution, a yellow-green transparent copper sol is formed, which has a very significant Tyndall phenomenon. After standing for about half an hour, the sol had a small amount of agglomerate, producing a black coarse copper precipitate, suggesting that the colloidal dispersion was not as stable as the solution dispersion.