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一、喷泉实验1.配制Na_2SiO_3溶液。称取10 g白色硅酸钠晶体于小烧杯中,加入10 mL蒸馏水并搅拌,使晶体完全溶解。2.制备硅胶。向小烧杯逐滴加入3 mol/L的硫酸,开始无现象,随着硫酸的加入,有白色胶冻状物质生成(用激光笔照射,有丁达尔现象)。当白色沉淀的量不再增加,停止加酸,充分振荡,用硬纸片盖住小烧杯静置24
First, the fountain experiment 1. Preparation Na_2SiO_3 solution. Weigh 10 g of white sodium silicate crystals in a small beaker, add 10 mL of distilled water and stir until the crystals are completely dissolved. 2. Preparation of silica gel. To the small beaker was added dropwise 3 mol / L of sulfuric acid, began to no phenomenon, with the addition of sulfuric acid, a white jelly-like material generated (with a laser pointer irradiation, a Tyndall phenomenon). When the amount of white precipitate is no longer increased, stop adding acid, full oscillation, cover the small beaker with a piece of cardboard resting 24