CHEMICAL AND PHYSICAL PROPERTIES
Physical Description | Lead chromate appears as yellow or orange-yellow powder. One of the most insoluble salts. Basic lead chromates are used as pigments. (NTP, 1992) |
---|---|
Color/Form | Yellow or orange-yellow powder |
Odor | Odorless |
Boiling Point | Decomposes (NTP, 1992) |
Melting Point | 1551 °F (NTP, 1992) |
Solubility | less than 1 mg/mL at 66 °F (NTP, 1992) |
Density | 6.12 at 59 °F (NTP, 1992) - Denser than water; will sink |
Vapor Pressure | Approximately 0 mm Hg |
Stability/Shelf Life | Stable under recommended storage conditions. |
Decomposition | When heated to decomposition it emits toxic fumes of /inorganic lead/ |
pH | Bivalent chromium compounds are basic |
Refractive Index | Index of refraction: 2.31, 2.37 (Li /lamp/), 2.66 |
Other Experimental Properties | Lead chromate displays colors that indicate its trimorphism. The stable form is monoclinic and has an orange-yellow color. An unstable tetragonal orange-red form is isomorphous with, and stabilized by, PbMoO4. A second unstable yellow form is rthorhombic, isomorphous with and stabilized by PbSO4. The diversity shown by the lead salt is the key to its versatility as a pigment. |
Chemical Classes | Metals -> Lead Compounds, Inorganic |
COMPUTED DESCRIPTORS
Molecular Weight | 323 g/mol |
---|---|
Hydrogen Bond Donor Count | 0 |
Hydrogen Bond Acceptor Count | 4 |
Rotatable Bond Count | 0 |
Exact Mass | 323.89682 g/mol |
Monoisotopic Mass | 323.89682 g/mol |
Topological Polar Surface Area | 80.3 Ų |
Heavy Atom Count | 6 |
Formal Charge | 0 |
Complexity | 62.2 |
Isotope Atom Count | 0 |
Defined Atom Stereocenter Count | 0 |
Undefined Atom Stereocenter Count | 0 |
Defined Bond Stereocenter Count | 0 |
Undefined Bond Stereocenter Count | 0 |
Covalently-Bonded Unit Count | 2 |
Compound Is Canonicalized | Yes |
PRODUCT INTRODUCTION
description
Lead chromate appears as yellow or orange-yellow powder. One of the most insoluble salts. Basic lead chromates are used as pigments. (NTP, 1992)