The long-standing demonstration of cotton soaked in hydrochloric acid on one end of a long tube and cotton soaked in ammonia at the other end has provided students a great visual for how gases at the same temperature are traveling at different average rates. However, the Next Generation Science Standards call for students to experience and investigate phenomena in an inquiry manner. Adding a smaller scale reaction for students to study and follow it with the traditional demonstration has resulted in a rich experience for students. This is an example of how something ‘old’ still has a place in the high school chemistry classroom.

Discovering Graham's law

ACS Fall 2021

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.