Hirschhornsalz (baker's ammonia) and the chemical equilibrium – experiments using digital pressure sensors

Abstract

Digitale Messsensoren bieten das Potential, schwer verständliche oder schwer beobachtbare Phänomene, wie die Bildung farbloser Gase oder die Erhöhung oder Erniedrigung des Drucks, während einer chemischen Reaktion sichtbar und somit besser begreifbar zu machen. Zudem kann durch den Einsatz digitaler Messsensoren ein neuer Blick auf altbewährte Experimente ermöglicht werden. In diesem Beitrag werden dazu Experimente zum chemischen Gleichgewicht mit Hirschhornsalz unter Verwendung eines digitalen Drucksensors vorgestellt.

Pressure’s On: Exploring the Course of Chemical Reactions with ARDUINO and GeoGebra in a Hands-On Science Approach

“…In addition to this content-related, instructional perspective, the advantage of low costs of ARDUINO-based sensors as well as the open applicability through the use of OER software needs to be stated, as the material transfer into schools is often hindered by financial reasons . When thinking more broadly of the potential of ARDUINO-based sensors, the use of this special pressure sensor is not limited to the proposed experiment and can be used to teach different school-related science contents, such as the temperature dependence of chemical equilibrium using the example of decomposition reactions or the experimental verification of gas laws (Boyle-Mariotte, Amonton) under isothermal and isochoric conditions, respectively. With regard to the large variety of possible sensors using ARDUINO, for example, pH sensors, it is also possible to implement this type of paired activity in higher education settings where students are expected to derive rate constants and determine activation energies graphically based on them.…”