论文部分内容阅读
哈尔滨铁路工厂化验科因近来市上缺乏石蕊纸,为解决这项指示剂的困难,我们参照苏联著化学纯粹试药书,用自有的石蕊试药,制成石蕊纸,茲将经验介绍如下。制法:1.制取蓝色石蕊纸取1份石蕊药放入6份水内,时常振荡,然后过滤之。将滤液分成二份,在其中一份溶液内,加稀磷酸(在特殊情况下可加硫酸),到发淡红色为止。然后将二份溶液混合之,用此溶液把滤纸润湿,(译者按先将滤纸剪成细长条),然后放在无酸碱蒸气及
Due to the lack of litmus paper on the market recently in Harbin, in order to solve the difficulty of this indicator, we refer to the Soviet Union’s purely chemical reagent book and use its own litmus reagent to make a litmus paper. Experience is as follows. System of law: 1 Preparation of blue litmus paper Take 1 part of the litmus drug into 6 parts of water, often oscillation, and then filtered. The filtrate was divided into two, in one of the solution, add dilute phosphoric acid (in special cases can be added sulfuric acid) until the light red. The two solutions are then mixed and the filter paper is wetted with this solution (the translator cuts the filter paper into sliver strips first) and then placed in an acid-free base steam and