Lead II Chloride Formula is expressed as PbCl2, and it is odourless and colourless. Lead (ll) chloride is a white solid compound found in nature as the mineral cotunnite.This lead-based reagent is especially important due to its stability - unlike CCl4 or SiCl4, PbCl4 decomposes at room temperature into the much more stable PbCl2. As elements of group 4 have two oxidation states (+4 and +2), the stability of +4 decreases while +2 increases down the group; this makes PbCl2 much more stable than lead tetrachloride.
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There are six chloride ions in each vertice of the triangle prism with lead as its center atom, and three beyond the surfaces of each rectangular prism face. As a result, the chloride ions are not evenly spaced. Seven of the nine chlorine atoms are located between 280 and 309 pm, while the other two are between 270 and 280 pm. Therefore, PbCl2 forms an orthorhombic needle structure, also called an orthorhombic dipyramidal, which has a point group of 2m / 2m / 2m. Each lead atom has a coordination number of 9. As a result, the structural formula of lead chloride can be found below in terms of its coordinate geometry. Ad chloride molecules are shown in the following diagram.Also Check - Iron (III) Hydroxide Formula
Property Name | Value |
Molar mass | 278.10 g / mol |
The chemical formula of lead chloride | PbCl2 |
Appearance | White and odorless solid |
Hardness | 1.5 - 2mohs scale |
Density | 5.85 g /cm3 |
Boiling point | 950 oC or 1740 oF or 1220 K |
Melting point | 501 oC or 934 oF or 774 K |
Crystal structure | orthorhombic, oP12 |
Space group | Pnma No. 62 |
Solubility in water | 0.99 g in 1L of water at 20 oC |
Solubility product (Ksp) | 1.7 x 10-5 at 20 oC |
Solubility | It is slightly soluble in HCl and ammonia, insoluble in alcohol, soluble in hot water, in the presence of alkali hydroxide, and in concentrated HCl. (>6M) |
Magnetic susceptibility | -73.8 x 10-6 cm3 / mol |
Refractive index | 2.199 |
Std. molar entropy | 135.98 J K-1 mol-1 |
Std. enthalpy of formation | -359.4 KJ / mol |
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