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File:37. Реакција на калиум со вода.ogv

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Македонски: Мало парче калиум се става во епрувета во која има вода. Епруветата е поставена во сад со вода заради безбедносни причини. Кога металот доаѓа во контакт со водата, веднаш започнува реакција која е значително побурна во однос на реакцијата со литиум и со натриум.

2K(s) + 2H2O(l) = 2KOH(aq) + H2(g)

Кога ќе се стават неколку капки фенолфталеин во реакциониот систем, бојата на растворот станува малиновоцрвена. Ова е доказ дека се образувало соединение со базни својства (калиум хидроксид, КOH).

Осмислено и изведено од Марина Стојановска, Миха Буклески и Владимир Петрушевски, Институт за хемија, ПМФ, УКИМ, Скопје.
English: Small piece of potassium metal is added in a test tube filled with water. The test tube is placed in a jar with water for safety reasons. When the metal touches the water a reaction far more vigorous then the one with lithium or sodium, can be observed.

2K(s) + 2H2O(l) = 2KOH(aq) + H2(g)

When few drops of phenolphthalein are added to the reaction mixture, the color of the solution becomes raspberry red. This is an indication that a compound with basic properties (potassium hydroxide, KOH) has been formed.

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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22 January 2020

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