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Names | |||
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Other names
Potassium chlorate(V), Potcrate, Berthollet salt
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Identifiers | |||
3D model (JSmol)
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ChEMBL | |||
ChemSpider | |||
ECHA InfoCard | 100.021.173 | ||
EC Number |
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PubChem CID
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RTECS number |
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UNII | |||
UN number | 1485 | ||
CompTox Dashboard (EPA)
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Properties | |||
KClO3 | |||
Molar mass | 122.55 g mol−1 | ||
Appearance | white crystals or powder | ||
Density | 2.32 g/cm3 | ||
Melting point | 356 °C (673 °F; 629 K) | ||
Boiling point | 400 °C (752 °F; 673 K) decomposes[1] | ||
3.13 g/100 mL (0 °C) 4.46 g/100 mL (10 °C) 8.15 g/100 mL (25 °C) 13.21 g/100 mL (40 °C) 53.51 g/100 mL (100 °C) 183 g/100 g (190 °C) 2930 g/100 g (330 °C)[2] | |||
Solubility | soluble in glycerol negligible in acetone and liquid ammonia[1] | ||
Solubility in glycerol | 1 g/100 g (20 °C)[1] | ||
−42.8·10−6 cm3/mol | |||
Refractive index (nD)
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1.40835 | ||
Structure | |||
monoclinic | |||
Thermochemistry | |||
Heat capacity (C)
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100.25 J/mol·K[1] | ||
Std molar
entropy (S⦵298) |
142.97 J/mol·K[3][1] | ||
Std enthalpy of
formation (ΔfH⦵298) |
−391.2 kJ/mol[3][1] | ||
Gibbs free energy (ΔfG⦵)
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-289.9 kJ/mol[1] | ||
Hazards | |||
GHS labelling: | |||
[4] | |||
Danger | |||
H271, H302, H332, H411[4] | |||
P220, P273[4] | |||
NFPA 704 (fire diamond) | |||
Lethal dose or concentration (LD, LC): | |||
LD50 (median dose)
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1870 mg/kg (oral, rat)[5] | ||
Safety data sheet (SDS) | ICSC 0548 | ||
Related compounds | |||
Other anions
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Potassium bromate Potassium iodate Potassium nitrate | ||
Other cations
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Ammonium chlorate Sodium chlorate Barium chlorate | ||
Related compounds
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Potassium chloride Potassium hypochlorite Potassium chlorite Potassium perchlorate | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Potassium chlorate is a compound containing potassium, chlorine and oxygen, with the molecular formula KClO3. In its pure form, it is a white crystalline substance. After sodium chlorate, it is the second most common chlorate in industrial use. It is a strong oxidizing agent and its most important application is in safety matches.[6] In other applications it is mostly obsolete and has been replaced by safer alternatives in recent decades. It has been used