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Sodium iodide

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Identification
Molecular formula
NaI
CAS number
7681-82-5
IUPAC name
sodium;iodide
State
State

Solid: Sodium iodide is typically encountered as a solid at room temperature.

Melting point (Celsius)
661.00
Melting point (Kelvin)
934.15
Boiling point (Celsius)
1 304.00
Boiling point (Kelvin)
1 577.15
General information
Molecular weight
149.89g/mol
Molar mass
149.8940g/mol
Density
3.6670g/cm3
Appearence

Sodium iodide appears as a white, crystalline solid that is highly soluble in water and hygroscopic in nature.

Comment on solubility

Solubility of Sodium Iodide (NaI)

Sodium iodide (NaI) is a chemical compound known for its excellent solubility in water. This characteristic is primarily due to the ionic nature of the compound, which allows it to dissociate easily into its constituent ions when dissolved. Here are some key points regarding its solubility:

  • High Solubility: NaI is highly soluble in water, with a solubility of around 1400 g/L at 25°C.
  • Temperature Effect: As temperature increases, the solubility of sodium iodide tends to increase as well, which is typical for many salts.
  • Polar Solvent Interaction: The polar nature of water molecules interacts effectively with the Na+ and I- ions, facilitating the dissolution process.

In addition to water, sodium iodide is also soluble in other polar solvents, although its solubility decreases in nonpolar solvents. This robust solubility makes NaI an ideal candidate for various applications in pharmaceuticals and chemical synthesis.

To summarize, the principles governing the solubility of sodium iodide highlight its behavior in different environments, emphasizing “the more ionic and polar a compound, the more likely it is to dissolve in polar solvents.”

Interesting facts

Interesting Facts About Sodium Iodide (NaI)

Sodium iodide, commonly referred to as NaI, is a fascinating compound that has applications across various fields, from medicine to chemistry. Here are some intriguing facts about this notable compound:

  • Medical Applications: Sodium iodide is often used in medicine, particularly in thyroid imaging and therapy. It acts as a tracers in radioiodine uptake tests, helping doctors to diagnose thyroid diseases.
  • Role in Radiation Therapy: In radioactive iodine therapy, sodium iodide can be used to treat hyperthyroidism and certain types of thyroid cancer. The sodium and iodide ions help in delivering the radioactive iodine directly to thyroid cells.
  • Preparation: Sodium iodide can be prepared by the reaction of iodine with sodium hydroxide or by neutralizing hydroiodic acid with sodium carbonate. This illustrates the principle of acid-base reactions in forming salts.
  • Solubility: While sodium iodide is soluble in water, its solubility can significantly affect the studies involving ionic interactions in solutions, providing insights into solution chemistry.
  • Safety Considerations: Despite its medical uses, care must be taken when handling sodium iodide. It can be harmful in large doses, which emphasizes the importance of dosage control in pharmaceuticals.

Overall, sodium iodide not only highlights the interplay between sodium and iodine but also the compound's significance in both chemical synthesis and its contributions to healthcare. As a chemistry student or scientist, understanding such compounds can illuminate broader topics in inorganic chemistry and medicinal applications.

A quote from a renowned chemist: "The beauty of chemistry lies in the compounds that make up our world, bridging the living and the synthetic." - Anonymous

Synonyms
sodium iodide
7681-82-5
Sodium monoiodide
Ioduril
Soiodin
Iodure de sodium
sodiumiodide
Jodid sodny
Natriumjodid
Natrii iodidum
Sodium iodide (NaI)
sodium;iodide
Caswell No. 777
HSDB 750
Iodide (as sodium iodide)
EINECS 231-679-3
UNII-F5WR8N145C
MFCD00003532
NSC 77388
NSC-77388
Fdy-5301
EPA Pesticide Chemical Code 075702
F5WR8N145C
Sodium Iodide,99%
DTXSID2041125
CHEBI:33167
Sodium iodide [USP:JAN]
CHEMBL1644695
DTXCID0021125
EC 231-679-3
Sodium iodide, ultra dry
Sodium iodide (USP:JAN)
SODIUM IODIDE (II)
SODIUM IODIDE [II]
SODIUM IODIDE (MART.)
SODIUM IODIDE [MART.]
Jodid sodny [Czech]
Natriumjodid [German]
SODIUM IODIDE (EP MONOGRAPH)
SODIUM IODIDE [EP MONOGRAPH]
SODIUM IODIDE (USP MONOGRAPH)
SODIUM IODIDE [USP MONOGRAPH]
Anayodin; Ioduril; NSC 77388; Sodium Monoiodide; Soiodin;
sodium-iodide
iodeto de sodio
ioduro di sodio
yoduro de sodio
sodium iodide-
Sodium Iodide 20%
Sodium iodide, anhydrous
Sodium iodide, ACS grade
WLN: NA I
SODIUM IODIDE [MI]
sodium iodine-131(1-)
SODIUM IODIDE [JAN]
SODIUM IODIDE [HSDB]
Sodium iodide (JP17/USP)
SODIUM IODIDE [VANDF]
SODIUM IODIDE [WHO-DD]
SODIUM IODIDE (ANHYDROUS)
Sodium iodide, Trace metals grade
BCP22179
HY-B1770
NSC77388
Tox21_301379
AKOS015950612
AKOS016015354
DB11119
FS01276
NCGC00255631-01
CAS-7681-82-5
IODIDE (AS SODIUM IODIDE) [VANDF]
CS-0013799
NS00075686
S0564
D04874
Q390305
231-679-3