Sodium iodide

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  Sodium iodide   
Names: sodium iodide

Formula: NaI
SMILES: [Na+].[I-]
Molar mass: 149.890 g/mol
Density: 3.665 g/cm3
Crystal system: cubic
a=3.24 Å
3.2400 Å
0.3240 nm
, b=3.24 Å
3.2400 Å
0.3240 nm
, c=3.24 Å
3.2400 Å
0.3240 nm
α=90°
90°  
, β=90°
90°  
, γ=90°
90°  

Forms:
https://media.crystalls.info/w/uploads/media/Tetragonal_flat_prism.json


https://media.crystalls.info/w/uploads/media/Tetragonal_prism.json


Color: colorless
Melting point: 662°C
935.15 K
1,223.6 °F
1,683.27 °R

Boiling point: 1304°C
1,577.15 K
2,379.2 °F
2,838.87 °R

Refractive index: 1.7745
Electrical properties: dielectric
Magnetic properties: diamagnetic
χ=-57.0 · 10-6 cm³/mol
Radiation properties: scintillator
Stability: slightly hygroscopic
Hardness: strong
Toxicity: slightly toxic

Description

Inorganic compound, salt of alkaline metal sodium and inorganic hydroiodic acid. Doesn`t form water hydrates

Synthesis

Reaction between iodine, sodium hydroxide and hydrogen peroxide

Chemical equation:

2NaOH + I2 + H2O2 = 2NaI + 2H2O + O2

For preparation 100g of sodium iodide a 26.68g of hydroxide, 378.21g of 3% peroxide or 37.82g of 30% peroxide and 84.66g of iodine is required.

Add to the flask with hydroxide solution hydrogen peroxide and then add small parts of iodine with stirring until oxide emission will stop. For purifying compound from hydroxide add large amount of cold ethanol, acetone or toluene to solution, salt will settle to the bottom in the form of fine crystals or powder. Filter precipitate and wash it with small amount of the same solvent, then filter the solution and use it for crystal growing.

Reaction between sodium sodium hydroxide or carbonate and hydroiodic acid

Chemical equation:

NaOH + HI = NaI + H2O
Na2CO3 + 2HI = 2NaI + H2O + CO2

For preparation 100g of sodium iodide a 26.68g of hydroxide or 35.36g of carbonate and 149.71g of 57% acid is required.

Add acid to the flask, then add small parts of sodium compound with stirring until heating will stop (attention, the solution may boil!) or, if you use carbonate, until carbon dioxide emission will stop.
The problem is that hydroiodic acid is rarely occurs, so reaction is rarely used.' '

Influence of temperature

Dissolving is endothermic, solution cools much, so use hot water or using heat.
Rapid cooling causes prismatic crystals growth.

Influence of impurities

Excess of iodine causes reddening of solution, excess of potassium hydroxide causes slowing down crystal growth or finally stops it.

Storage conditions

Store in its original form or under several layers of varnish at average humidity and room temperature. Do not store in matchboxes or cotton wool and do not heat.

Notes

Reacts with humid air with forming iodine at the crystal surface, so crystals becomes more dark-colored.
Too big solubility in water is intervenes growing process, so using organic solvents should be preferred.

Solubility

Temperatureg/100g of waterg/100g of ethanolg/100g of methanolg/100g of acetoneg/100g of DMSOg/100g of furfuralg/100g of formic acidg/100g of propanolg/100g of 2-butanoneg/100g of ammoniag/100g of hydrazineg/100g of ethylenediamineg/100g of acetamideg/100g of dimethylformamideg/100g of N-methylformamideg/100g of nitromethaneg/100g of acetonitrileg/100g of propionitrileg/100g of allyl alcoholg/100g of amyl alcoholg/100g of benzyl alcohol
0°C
273.15 K
32 °F
491.67 °R
158.7
158.7 g/100g
61.345 %
13.1
13.1 g/100g
11.583 %
131.9
131.9 g/100g
56.878 %
0.3
0.3 g/100g
0.299 %
28.32
28.32 g/100g
22.07 %
11.6
11.6 g/100g
10.394 %
10°C
283.15 K
50 °F
509.67 °R
167
167 g/100g
62.547 %
65
65 g/100g
39.394 %
~21.6
21.6 g/100g
17.763 %
15°C
288.15 K
59 °F
518.67 °R
~173
173 g/100g
63.37 %
~68.9
68.9 g/100g
40.793 %
~25.8
25.8 g/100g
20.509 %
20°C
293.15 K
68 °F
527.67 °R
179.3
179.3 g/100g
64.196 %
46
46 g/100g
31.507 %
72.7
72.7 g/100g
42.096 %
30
30 g/100g
23.077 %
62.71
62.71 g/100g
38.541 %
15
15 g/100g
13.043 %
61
61 g/100g
37.888 %
25°C
298.15 K
77 °F
536.67 °R
184.2
184.2 g/100g
64.814 %
43.3
43.3 g/100g
30.216 %
78
78 g/100g
43.82 %
39.9
39.9 g/100g
28.52 %
30
30 g/100g
23.077 %
21.6
21.6 g/100g
17.763 %
61.81
61.81 g/100g
38.199 %
28.22
28.22 g/100g
22.009 %
146.3
146.3 g/100g
59.399 %
34.6
34.6 g/100g
25.706 %
14.4
14.4 g/100g
12.587 %
61
61 g/100g
37.888 %
0.42
0.42 g/100g
0.418 %
23.63
23.63 g/100g
19.113 %
7.96
7.96 g/100g
7.373 %
28.49
28.49 g/100g
22.173 %
16.3
16.3 g/100g
14.015 %
14.4
14.4 g/100g
12.587 %
30°C
303.15 K
86 °F
545.67 °R
190
190 g/100g
65.517 %
~78.9
78.9 g/100g
44.103 %
~38.5
38.5 g/100g
27.798 %
40°C
313.15 K
104 °F
563.67 °R
205
205 g/100g
67.213 %
80.7
80.7 g/100g
44.66 %
~35.6
35.6 g/100g
26.254 %
50°C
323.15 K
122 °F
581.67 °R
227.8
227.8 g/100g
69.494 %
~80.1
80.1 g/100g
44.475 %
~32.8
32.8 g/100g
24.699 %
8.9
8.9 g/100g
8.173 %
60°C
333.15 K
140 °F
599.67 °R
257
257 g/100g
71.989 %
79.4
79.4 g/100g
44.259 %
29.9
29.9 g/100g
23.018 %
70°C
343.15 K
158 °F
617.67 °R
294
294 g/100g
74.619 %
~25.9
25.9 g/100g
20.572 %
80°C
353.15 K
176 °F
635.67 °R
295
295 g/100g
74.684 %
21.8
21.8 g/100g
17.898 %
5.62
5.62 g/100g
5.321 %
90°C
363.15 K
194 °F
653.67 °R
~299
299 g/100g
74.937 %
100°C
373.15 K
212 °F
671.67 °R
302
302 g/100g
75.124 %
Highly soluble in glycerol. Soluble in pyridine. Insoluble in isopropanol.

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