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Vízbontás

Kémiaórán biztos láttátok már ezt a kísérletet.
Én laposelemet és csapvizet használtam a kísérlethez.

 

 

A víz elektromos árammal (egyenárammal) két különböző gázra bontható, hidrogénre és oxigénre.

 

hoffmannfele-vizbontokeszulek.png

A vízbontási kísérlet fontos és jellemző tapasztalata, hogy mindig a pozitív pólus feletti csőben gyűlik össze kevesebb gáz.

A két póluson fejlődött gáz színtelen, szagtalan.

A vízbontó készülékben valójában nem tiszta víz van, mert a tiszta víz csak kis mértékben vezeti az áramot, ezért célszerű csapvizet vagy valamilyen oldatot használni. Azonban figyelni kell, hogy az elektromos áram ne legyen képes átalakítani a „segédanyagot”  csak a vizet.

Vizsgáljuk meg a gázok tulajdonságait! Érintsünk parázsló gyújtópálcát először az egyik, azután a másik nyíláshoz, miközben óvatosan megnyitjuk a gázcsapot!

A negatív pólus feletti gáz meggyullad, biztosan tudhatjuk hogy itt hidrogén keletkezett. A pozitív pólus feletti gáz ugyan nem gyullad meg, de hatására a gyújtópálca izzása felerősödik, majd lángra is lobban, itt oxigén keletkezett.

Vízbontás során elektromos áram hatására kémiai változás, azaz kémiai reakció következik be.
Mivel mi adtuk be az energiát az átalakuláshoz, endoterm folyamatról beszélhetünk. 

A saját vízbontó készülékem: lásd. "Konyhasó elektrolízise"

 

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