Chemical reactions of the elementsReaction of rubidium with airRubidium is very soft and easily cut. The resulting surface is bright and shiny. However, this surface soon tarnishes because of reaction with oxygen and moisture from the air. If rubidium is burned in air, the result is mainly formation of dark brown rubidium superoxide, RbO2. Rb(s) + O2(g) → RbO2(s) Reaction of rubidium with waterRubidium metal reacts very rapidly with water to form a colourless solution of rubidium hydroxide (RbOH) and hydrogen gas (H2). The resulting solution is basic because of the dissolved hydroxide. The reaction is very exothermic. The reaction is so fast that if the reaction is carried out in a glass vessel, the glass container may well shatter. The reaction is slower than that of caesium (immediately below rubidium in the periodic table), but faster than that of potassium (immediately above rubidium in the periodic table). 2K(s) + 2H2O → 2KOH(aq) + H2(g) Reaction of rubidium with the halogensRubidium metal reacts vigorously with all the halogens to form rubidium halides. So, it reacts with fluorine, F2, chlorine, Cl2, bromine, I2, and iodine, I2, to form respectively rubidium(I) bromide, RbF, rubidium(I) chloride, RbCl, rubidium(I) bromide, RbBr, and rubidium(I) iodide, RbI. 2Rb(s) + F2(g) → RbF(s) 2Rb(s) + Cl2(g) → RbCl(s) 2Rb(s) + Br2(g) → RbBr(s) 2Rb(s) + I2(g) → RbI(s) Reaction of rubidium with acidsRubidium metal dissolves readily in dilute sulphuric acid to form solutions containing the aquated Rb(I) ion together with hydrogen gas, H2. 2Rb(s) + H2SO4(aq) → 2Rb+(aq) + SO42-(aq) + H2(g) Reaction of rubidium with basesRubidium metal reacts very rapidly with water to form a colourless basic solution of rubidium hydroxide (RbOH) and hydrogen gas (H2). The reaction continues even when the solution becomes basic. The resulting solution is basic because of the dissolved hydroxide. The reaction is very exothermic. The reaction is so fast that if the reaction is carried out in a glass vessel, the glass container may well shatter. The reaction is slower than that of caesium (immediately below rubidium in the periodic table), but faster than that of potassium (immediately above rubidium in the periodic table). As the reaction proceeds, the concentration of base increases. 2K(s) + 2H2O → 2KOH(aq) + H2(g) WebElements ShopWebElements now has a WebElements shop at which you can buy periodic table posters, mugs, T-shirts, games, molecular models, and more.
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Rubidium
Rubidium
Rubidium
Rubidium
Rubidio
Rubidio
Rubidium
Rubídio
