<abstract xmlns="http://www.w3.org/1999/xhtml"><p>Mechanochemical reactions proceed if solid reactants combine together by grinding, milling or kneading with no or minimal solvent. It is possible to observe changes: fizzing, foaming, colour changes, water release. This process is manually simple and there are several mechanochemical reactions which can be demonstrated during school laboratory lessons. For high school pupils there exist five possibilities of inorganic synthesis: mechanochemical synthesis, crystallisation, precipitation, filtration and decantation. The preparation of aluminium hydroxide in the school laboratory is described in this paper. Five mechanochemical reaction schemes were tested by pupils in their laboratories. The pupils conducted the experiments and filled in worksheets to accompany the practical. On the basis of their results, a suitable procedure for school use is suggested.</p></abstract>

Mechanochemical reactions proceed if solid reactants combine together by grinding, milling or kneading with no or minimal solvent. It is possible to observe changes: fizzing, foaming, colour changes, water release. This process is manually simple and there are several mechanochemical reactions which can be demonstrated during school laboratory lessons. For high school pupils there exist five possibilities of inorganic synthesis: mechanochemical synthesis, crystallisation, precipitation, filtration and decantation. The preparation of aluminium hydroxide in the school laboratory is described in this paper. Five mechanochemical reaction schemes were tested by pupils in their laboratories. The pupils conducted the experiments and filled in worksheets to accompany the practical. On the basis of their results, a suitable procedure for school use is suggested.

Preparation of Aluminium Hydroxide with Mechanochemical Synthesis in the Middle School Laboratory Lesson

Department of Didactics, Psychology and Pedagogy, Comenius University in Bratislava, Mlynská dolina, Ilkovičova 6, 842 15 Bratislava,

Department of Inorganic Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská dolina, Ilkovičova 6, 842 15 Bratislava,

Chemistry-Didactics-Ecology-Metrology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Mechanochemical reactions proceed if solid reactants combine together by grinding, milling or kneading with no or minimal solvent. It is possible to observe...

Preparation of Aluminium Hydroxide with Mechanochemical Synthesis in the Middle School Laboratory Lesson

Publié en ligne: 10 févr. 2017

Pages: 53 - 59

DOI: https://doi.org/10.1515/cdem-2016-0004

Mots clés
mechanochemical synthesis, pupils’ laboratory skills, aluminium hydroxide

© 2016 Anna Okálová et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Preparation of Aluminium Hydroxide with Mechanochemical Synthesis in the Middle School Laboratory Lesson

Publié en ligne: 10 févr. 2017

Pages: 53 - 59

DOI: https://doi.org/10.1515/cdem-2016-0004

Mots clésmechanochemical synthesis, pupils’ laboratory skills, aluminium hydroxide

© 2016 Anna Okálová et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Mots clés
mechanochemical synthesis, pupils’ laboratory skills, aluminium hydroxide