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File:14. Слоновска паста за заби.webm

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Македонски: Експеримент познат како „слоновска паста за заби“. Во чашка внимателно се мешаат раствор од водород пероксид (H2O2) и течен детергент, а потоа се префрлаат во голем градуиран цилиндер. Кон содржината во цилиндерот се додава заситен раствор од калиум јодид (KI). Во моментот кога супстанците ќе дојдат во контакт се создава огромно количество пена која „чади“ (егзотермна реакција) и прилега на огромна паста за заби („слоновска паста“). Сумарната равенка е:
2H2O2(aq) = 2H2O(l) + O2(g).

Кислородот го напушта системот, предизвикувајќи силно пенење на течниот детергент. Јодидните јони играат улога на катализатор.

(1) H2O2(aq) + I–(aq) = H2O(l,g) + IO–(aq); и
(2) H2O2(aq) + IO–(aq) = H2O(l,g) + O2(g) + I–(aq).
Осмислено и изведено од Марина Стојановска, Миха Буклески и Владимир Петрушевски, Институт за хемија, ПМФ, УКИМ, Скопје.
English: Experiment known as 'elephant toothpaste'. Hydrogen peroxide solution and liquid detergent are carefully mixed in a beaker and transferred to a large cylinder. A saturated solution of potassium iodide (KI) is added to the cylinder. At the very contact of the solutions, a large amount of steaming foam (exothermic reaction) is formed resembling a giant toothpaste ('elephant toothpaste'). The overall equation for this reaction is:
2H2O2(aq) = 2H2O(l) + O2(g).

Oxygen gas leaves the system, causing strong foaming of the liquid detergent. Iodide ions are used as a catalyst.

(1) H2O2(aq) + I–(aq) = H2O(l,g) + IO–(aq); and
(2) H2O2(aq) + IO–(aq) = H2O(l,g) + O2(g) + I–(aq).
Planned and performed by Marina Stojanovska, Miha Bukleski and Vladimir Petruševski, Department of Chemistry, FNSM, Ss. Cyril and Methodius University, Skopje, Macedonia.
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Author Petrovskyz

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