Potassium carbonate (K2CO3) is a white salt, soluble in water (insoluble in ethanol) which forms a strongly alkaline solution. It can be made as the product of potassium hydroxide's absorbent reaction with carbon dioxide. It presents a large capacity to absorb moisture.
Potassium and sodium because they are highly reactive metals and can react with air to produce flame. That's why they are kept under kerosene oil
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Ions bound together by electrostatic attraction form ionic crystals. Their arrangement varies depending on the ions’ sizes or the radius ratio (the ratio of the radii of the positive to the negative ion). A simple cubic crystal lattice has ions equally spaced in 3D at 90° angles.
Stability of ionic solids depends on lattice energy, which is released in the form of heat when two ions are brought together to form a solid. Lattice energy is the sum of all the interactions within the crystal.
The properties of ionic crystals reflect the strong interactions that exist between the ions. They are very poor conductors of electricity, have strong absorption of infrared radiation, and are easily cleaved. These solids tend to be quite hard and have high melting points.
ionic crystalA class of crystal consisting of a lattice of ions held together by electrostatic interactions; they exhibit strong absorption of infrared radiation and have planes along which they cleave easily.
crystal latticeA regular three-dimensional geometric arrangement of atoms, molecules, or ions in a crystal.
lattice energyThe energy required to separate the ions of an ionic solid (especially a crystal) to an infinite distance apart.
The Crystalline Form of Ionic Compounds
An ionic crystal consists of ions bound together by electrostatic attraction. The arrangement of ions in a regular, geometric structure is called a crystal lattice. Examples of such crystals are the alkali halides, which include:
potassium fluoride (KF)
potassium chloride (KCl)
potassium bromide (KBr)
potassium iodide (KI)
sodium fluoride (NaF)
other combinations of sodium, cesium, rubidium, or lithium ions with fluoride, bromide, chloride or iodide ions
These solids tend to be quite hard and have high melting points, reflecting the strong forces between oppositely-charged ions. The exact arrangement of ions in a lattice varies according to the size of the ions in the crystal.