File:24. Јаглерод диоксид со варова вода.ogv

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Македонски: Јаглерод диоксидот се добива во Кипов апарат при реакција на парчиња мермер со техничка хлороводородна киселина:

CaCO3(s) + HCl(aq) = CaCl2(aq) + CO2(g) + H2O(l)

Гасот се насочува во микропромивалка (промивалка за гасови) во која има раствор од калциум хидроксид (варова вода). По неколку секунди, растворот добива млечнобела боја. Ова е резултат на образуваното соединение кое е слабо растворливо во вода. Хемиската реакција која се одвива е добро позната и може да се претстави со равенката:

Ca(OH)2(aq) + CO2(g) = CaCO3(s)

Ако се продолжи со внесување СО2 во растворот кој содржи СаСО3, растворот ќе се избистри. Овој феномен може да се објасни преку образувањето на хидроген сол која е растворлива во вода:

CaCO3(s) + CO2(g) + H2O(l) = Ca(HCO3)2(aq)

Осмислено и изведено од Марина Стојановска, Миха Буклески и Владимир Петрушевски, Институт за хемија, ПМФ, УКИМ, Скопје.
English: Carbon dioxide is generated in a Kipp, by а reaction of marble chunks with hydrochloric acid (technical grade):

CaCO3(s) + HCl(aq) = CaCl2(aq) + CO2(g) + H2O(l)

The gas is passed through a wash-bottle filled with a saturated solution of calcium hydroxide (limewater). After few seconds one notices that the liquid in the tube becomes milky white. This is due to the product’s low solubility. The chemical reaction that takes place is well known and can be represented by the equation:

Ca(OH)2(aq) + CO2(g) = CaCO3(s)

If CO2 is further bubbled through the solution that contains CaCO3; the solution clears up. The phenomenon can be explained by the formation of a water-soluble hydrogen salt:

CaCO3(s) + CO2(g) + H2O(l) = Ca(HCO3)2(aq)

Planned and performed by Marina Stojanovska, Miha Bukleski and Vladimir Petruševski, Department of Chemistry, FNSM, Ss. Cyril and Methodius University, Skopje, Macedonia.
Date
Source Own work
Author Карас Студио

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