zacal som experimentovat s roznymi materialmi, a ich kombinaciami, z ktorych jedna bola spojenie hlinikovej folie a vodneho skla. z minulosti som vedel, ze hlinik reaguje na NaOH (Sifo), ktore ho chemicky rozpusta, a pri reakcii vznika vodik. po pridani vodneho skla (Kremicitan sodny) do roztoku NaOH a hliniku vznikli dve reakcie, v zavislosti od koncentracie NaOH. pri malej koncentracii sa vodne sklo zacalo zrazat na povrchu hliniku a po jeho vypaleni pomocou horaku, v hlinikovej folii vytvrdlo a do istej miery ho spevnilo. tvoril som roztoky s roznymy pomermi vodneho skla, vody a NaOH, do ktorych sa potom vkladala hlinikova folia. tu som v roztoku nechaval vacsinou 24h a potom ju okamzite vypalil horakom. koncentracie sa variovali, nakoniec som sa ustalil na koncentracii H20/vodne sklo/NaOH - 100g/100g/7g. vodne sklo brani reakcii NaOH s Al, a teda pri zvysovani pomeru vodneho skla k vode treba zvysovat aj mnozstvo NaOH.

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I started experimenting with different materials and their combinations, one of which was the combination of aluminum foil and water glass. I knew from the past that aluminum reacts with NaOH (Sifo), which chemically dissolves it, producing hydrogen. after adding waterglass (sodium silicate) to the NaOH solution and aluminum, two reactions occurred, depending on the concentration of NaOH. at a low concentration, the waterglass began to precipitate on the surface of the aluminum and after it was fired by a torch, it hardened in the aluminum foil and strengthened it to some extent. I created solutions with different ratios of waterglass, water and NaOH, into which I then added aluminum foil. I left it in the solution mostly for 24h and then immediately fired it with a torch. the concentrations varied, finally I settled on the concentration of H20/waterglass/NaOH - 100g/100g/7g. waterglass prevents the reaction of NaOH with Al, so when increasing the ratio of waterglass to water, the amount of NaOH must also be increased.

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Vodné sklo po vypálení horákom.

Waterglass after fired with a torch.

Naložený alobal v zmesy vodného skla, NaOH a vody v rôznych pomeroch.

Pickled aluminium foil in the mixture of waterglass, NaOH and water, in different ratios.

Tento chaloš dostal privela NaOH, fólia začernie. Vyzráža sa na jej povrchu vodné sklo, avšak NaOH ‘rozožerie’ fóliu, ktorá sa stáva krehkou. Je pekne vidno, ako aj keď je hliník ponorený iba časťou, reakcia prebieha aj mimo priameho dotyku s tekutinou. Podozrievam kapilárne vlastnosti vody.

This guy got a bit too much NaOH in the mixture, the foil gets black this way. On its surface, the waterglass precipitate, which is nice, but the foil gets really fragile this way, useless. This experiment nicely showcases how the reaction happens also outside the direct contact with the mixture. I suspect capillary properties of water.

Toto je rovnaký experiment ako vyššie, iba s menším pomerom NaOH. Snažil som sa zistiť, ako vysoko nad hladinou nastane reakcia a aký efekt na túto výšku majú chemikálie v roztoku.

This is the same experiment as above, but with a lesser amount of NaOH. I was trying to find out how high outside the mixture will the reaction occur and how does the ratios of chemicals affect this height.