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借助试纸颜色的变化以测试物质的性质,有简易、迅速、方便的特点。以下介绍几种常见特殊用途的试纸的制备和作用。 1 乙酸铅试纸(白色) 将3g乙酸铅溶于100mL水中,放入滤纸,浸透取出,放在无H_2S环境中晾干。 遇H_2S时由白变黑,检验痕量的H_2S。 2 淀粉试纸(白色) 将0.5g可溶性淀粉放入小烧杯中,加5mL水调成糊状,搅拌加入100mL沸水,加
With the change of the color of the test paper to test the properties of the material, there is a simple, rapid and convenient feature. The following describes the preparation and use of several common special purpose test strips. 1 Lead Acetate Test Paper (White) Dissolve 3 g of lead acetate in 100 mL of water, place in filter paper, soak it out, and leave it in an H 2 S-free environment. In the case of H 2 S, the color changes from white to black, and traces of H 2 S are examined. 2 Starch test paper (white) Put 0.5g soluble starch into a small beaker, add 5mL water to make a paste, stir to add 100mL boiling water, add