一、水玻璃溶液加盐酸生成凝胶实验的改进按教材132页作此实验,学生在滴加6N盐酸时,往往因加得太快而使盐酸过量,使生的成胶体颗粒由带负电荷一下子转变为带正电荷,胶粒带同性电荷相斥,又生成了稳定的溶胶,而不成凝胶。改进的操作步骤是:每加一滴盐酸,就摇 First, the water glass solution plus hydrochloric acid to generate gel experiments to improve this experiment according to the textbook 132 pages, students in the drop 6N hydrochloric acid, often due to add too fast and excessive hydrochloric acid, so that the raw colloidal particles are negatively charged Once it turns into a positive charge, the colloidal particles repel the same charge, and a stable sol is formed instead of a gel. The improved procedure is to shake every drop of hydrochloric acid