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日常生活中,人们难免会因不慎将衣服弄脏,留下让人厌烦的污渍。那么,如何利用物理化学知识,科学地去除衣服上的污渍斑迹呢?这要视污渍的种类而选择相应的合适的方法。一、盐析法除汗渍汗液是由汗腺分泌的液体。据有关书籍记载,正常人24小时内会不知不觉蒸发约600毫升~700毫升水溶液。汗水浸湿衣服,水分蒸发后,会在衣服上留下白痕即汗渍。汗渍用热水是难以洗掉的,将有汗渍的衣服在5%~10%的食盐水中浸泡一会儿,然后再用肥皂水洗涤即可。这其中的化学原理是什么呢?因为汗水中98%~99%的成分是水,1%~2%为少量食盐、尿素、乳酸、脂肪酸、糖、蛋白质、铁元
In daily life, people will inevitably be dirty clothes, leaving annoying stains. So, how to use the physical and chemical knowledge to scientifically remove stains on clothes it? This depends on the type of stain and choose the appropriate method. First, salting out sweat sweat is secreted by the sweat glands. According to the records of the books, normal people will unconsciously evaporate about 600 ml ~ 700 ml of water within 24 hours. Sweat soaked clothes, water evaporates, will leave white marks on the clothes that perspiration. Sweat stains are difficult to wash with hot water, sweat clothes will be 5% to 10% salt water soak for a while, then wash with soap and water can be. What is the chemical principle? Because 98% to 99% of sweat in water is water, 1% to 2% for a small amount of salt, urea, lactic acid, fatty acids, sugar, protein, iron