Sodium iodide
Sodium iodide (chemical formula NaI) is an ionic compound formed from the chemical reaction of sodium metal and iodine. Under standard conditions, it is a white, water-soluble solid comprising a 1:1 mix of sodium cations (Na+) and iodide anions (I−) in a crystal lattice. It is used mainly as a nutritional supplement and in organic chemistry. It is produced industrially as the salt formed when acidic iodides react with sodium hydroxide. It is a chaotropic salt.
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NaI(Tl) scintillators | |||
| Identifiers | |||
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3D model (JSmol) |
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| ChEBI | |||
| ChEMBL | |||
| ChemSpider | |||
| ECHA InfoCard | 100.028.800 | ||
PubChem CID |
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| UNII | |||
CompTox Dashboard (EPA) |
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| Properties | |||
| NaI | |||
| Molar mass | 149.894 | ||
| Appearance | white solid deliquescent | ||
| Odor | odorless | ||
| Density | 3.67 g cm−3 | ||
| Melting point | 661 °C (1,222 °F; 934 K) | ||
| Boiling point | 1,304 °C (2,379 °F; 1,577 K) | ||
| 1587 g/L (0 °C) 1842 g/L (25 °C) 2278 g/L (50 °C) 2940 g/L (70 °C) 3020 g/L (100 °C) | |||
| Solubility | ethanol, acetone | ||
| Band gap | 5.89 eV | ||
| −57×10−6 cm3 mol−1 | |||
Refractive index (nD) |
1.93 (300 nm) 1.774 (589 nm) 1.71 (10 μm) | ||
| Structure | |||
| Halite, cF8 | |||
| Fm3m, No. 225 | |||
a = 0.6462 nm | |||
Formula units (Z) |
4 | ||
| Octahedral | |||
| Thermochemistry | |||
Heat capacity (C) |
52.1 J mol−1 K−1 | ||
Std molar entropy (S⦵298) |
98.5 J mol−1 K−1 | ||
Std enthalpy of formation (ΔfH⦵298) |
−287.8 kJ mol−1 | ||
Gibbs free energy (ΔfG⦵) |
−286.1 kJ mol−1 | ||
| Hazards | |||
| Occupational safety and health (OHS/OSH): | |||
Main hazards |
Irritant, can harm the unborn child | ||
| GHS labelling: | |||
| Danger | |||
| H315, H319, H400 | |||
| P273, P305+P351+P338 | |||
| NFPA 704 (fire diamond) | |||
| Flash point | Non-flammable | ||
| Safety data sheet (SDS) | |||
| Related compounds | |||
Other anions |
Sodium fluoride Sodium chloride Sodium bromide Sodium astatide | ||
Other cations |
Lithium iodide Potassium iodide Rubidium iodide Caesium iodide Francium iodide | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references | |||
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