CO2 macht Wasser sauer – Küchenexperimente

############################# Video Source: www.youtube.com/watch?v=3VtSGnW9IZc

Aus stark sprudelndem Mineralwasser habe ich das CO2 rausgeschüttelt und in einem Luftballon aufgefangen. Durch das gelöste CO2 ist das Mineralwasser leicht sauer. Man erkennt das mit einem pH-Indikator. Im Vergleich dazu ist Leitungswasser neutral. • Wenn ich das gesammelte CO2 im Ballon in das Leitungswasser reinblubbern lasse, wird auch das Leitungswasser leicht sauer. • CO2 löst sich gut in Wasser und bildet Kohlensäure (H2CO3). • Das passiert auch in der Natur. Atmosphärisches CO2 steht im Gleichgewicht mit dem in den Meeren gelöstem CO2. • Das Gleichgewicht ist temperaturabhängig. Je kälter das Wasser ist, desto mehr CO2 kann sich darin 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