Effect of heat treatment on the expansivity of a pyrex glass

• Publisher: Elsevier Science
• Year: 1934
• Tongue: English
• Weight: 161 KB
• Volume: 217
• Category: Article
• ISSN: 0016-0032
• DOI: 10.1016/s0016-0032(34)90551-2

✦ Synopsis

Io7 current of chlorine. The product of the reaction was dissolved in water and filtered. The filter was not washed at this stage but was returned to the beaker and treated with diluted aqua regia to dissolve a small amount of metallic platinum. The resulting solution was filtered and the filter and paper pulp washed thoroughly with hot water. The filter was strongly ignited in a porcelain crucible and the small residue subjected to a second treatment with sodium chloride and chlorine. The crucible was covered with a Rose lid of quartz, and chlorine was introduced through a quartz tube. The salt mixture was finally just melted. No residue of platinum nor of rhodium remained after this treatment.

The reaction with sodium chloride and chlorine may be conducted entirely in a crucible, but if this is done it usually is necessary to repeat the treatment a third time.