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Potassium and water reaction1/16/2024 ![]() As the reaction continus, the concentration of base increases. The reaction is slower than that of rubidium (immediately below potassium in the periodic table), but faster than that of sodium (immediately above potassium in the periodic table). Early in the reaction, the potassium metal becomes so hot that it catches fire and burns with a characteristic pale lilac colour. The resulting solution is basic because of the dissolved hydroxide. The reaction continues even when the solution becomes basic. 6.2 Recall that alkali metals: are soft, have relatively low melting points 6.3 Describe the reactions of lithium, sodium and potassium with water OCR Chemistry B: 21st century. The silvery white metal is very soft and reacts rapidly with the oxygen in air. 6.3 Describe the reactions of lithium, sodium and potassium with water Edexcel Combined science. Potassium metal reacts very rapidly with water to form a colourless basic solution of potassium hydroxide (KOH) and hydrogen gas (H 2). Potassium reacts so violently with water that it bursts into flame. Potassium metal dissolves readily in dilute sulphuric acid to form solutions containing the aquated K(I) ion together with hydrogen gas, H 2.ĢK(s) + H 2SO 4(aq) → 2K +(aq) + SO 4 2-(aq) + H 2(g) Reaction of potassium with bases So, it reacts with fluorine, F 2, chlorine, Cl 2, bromine, I 2, and iodine, I 2, to form respectively potassium(I) bromide, KF, potassium(I) chloride, KCl, potassium(I) bromide, KBr, and potassium(I) iodide, KI.ĢK(s) + I 2(g) → KI(s) Reaction of potassium with acids Sodium adds a bright yellow color to a flame. The reaction is one way to make hydrogen gas. The reaction between an alkali metal and water is exothermic. Similarly, these metals react more vigorously with water. Potassium metal reacts vigorously with all the halogens to form potassium halides. Potassium oxidizes more quickly than sodium, while rubidium oxidizes instantly. The reaction is slower than that of rubidium (immediately below potassium in the periodic table), but faster than that of sodium (immediately above potassium in the periodic table).ĢK(s) + 2H 2O → 2KOH(aq) + H 2(g) Reaction of potassium with the halogens ![]() Potassium metal reacts very rapidly with water to form a colourless solution of potassium hydroxide (KOH) and hydrogen gas (H 2). ![]() K(s) + O 2(g) → KO 2(s) Reaction of potassium with water If potassium is burned in air, the result is mainly formation of orange potassium superoxide, KO 2. However, this surface soon tarnishes because of reaction with oxygen and moisture from the air. The resulting surface is bright and shiny.
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