化学是一门基础科学,它与四个现代化有着密切的关系,化学知识在日常生活中也有广泛的应用。为了普及科学知识,这里向大家介绍明矾的多种用途。 用淀粉(或面粉)制成的浆糊,日子一长就会发霉,如果在淀粉里加放少量明矾粉末制成的浆糊就不会发霉。这是什么道理呢? 如果你要把布和布衣服染色,要提高染色能力,可以在染料溶液里加进少量明矾粉末,就可得到比较满意的结果。这又是什么道理呢? Chemistry is a basic science. It has a close relationship with the four modernizations. Chemical knowledge is also widely used in daily life. In order to popularize scientific knowledge, here we introduce the various uses of alum. Paste made with starch (or flour) will mold for a long time. If a small amount of alum powder is added to the starch, it will not be moldy. What is the reason for this? If you want to dye fabrics and cloths to improve the dyeing ability, you can add a small amount of alum powder to the dye solution to get satisfactory results. What is the reason for this?