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一笔者利用一种紫萝葡做出一种紫色的指示剂和紫色试纸,用於测定酸硷溶液,非常灵敏。甚至在不同的酸硷液中也会显出不同的颜色来。兹将笔者所做的实验结果,摘录於後,因设备条件的关系有不精确甚至错误的地方,尚希诸读者同志不吝指教。本指示剂及试纸的制法: 指示剂的制法:将紫色萝葡洗净後,连皮带肉用刀刮成很细的丝,(因为皮的颜色较肉为紫,且
One person used a purple radish to make a purple indicator and a purple test paper, which was very sensitive to the determination of the acid hydrazine solution. Even in different acid solutions, different colors will appear. After extracting the results of the experiments done by the author, because of the inaccuracy or even the wrong place of the equipment conditions, the comrades of the Sangxi readers are not inexperienced. The method for preparing the indicator and the test paper: The method for producing the indicator: after washing the purple radish, even the belt meat knife is scraped into a very thin wire (because the color of the skin is more purple than the meat, and