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| Urea | |
|---|---|
| Names: | urea carbamide carbonylamide diaminomethanal |
| Formula: | CO(NH4)2 |
| Molar mass: | 64.088 g/mol |
| Density: | 1.32 g/cm3 |
| Crystal system: | tetragonal a=5.661 Å, b=5.661 Åα=90°, β=90°, γ=90° |
| Shapes: | |
| Color: | colorless |
| Melting point: | 132.7 °C405.85 K <br />270.86 °F <br />730.53 °R <br /> |
| Decomposition point: | 174 °C447.15 K <br />345.2 °F <br />804.87 °R <br /> |
| Refractive index: | 1.4840 |
| Magnetic properties: | diamagnetic χ=-3.34 · 10-5cm³/mol |
| Stability: | stable |
| Hardness: | fragile |
| Toxicity: | non-toxic LD50=12000mg/kg |
Description
Organic compound, carbonic acid diamide. Doesn't form water hydrates.
Where to buy
Can be bought in fertilizers store (as "Urea").
Influence of impurities
In water solutions may form adducts with other compounds. Adduct crystals have different shapes and don't dehydrate as much.
Notes
In most cases, poly crystals are formed
Solubility
| Temperature | g/100,00 g water | g/100,00 g ethanol | g/100,00 g methanol | g/100,00 g diethyl ether | g/100,00 g pyridine | g/100,00 g pyridine 50% | g/100,00 g ethyl acetate | g/100,00 g ethylene glycol | g/100,00 g propanol | g/100,00 g isopropanol | g/100,00 g isobutanol | g/100,00 g ammonia | g/100,00 g allyl alcohol | g/100,00 g isoamyl alcohol | g/100,00 g acrylic acid 70% |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| -26.5°C246.65 K <br />-15.7 °F <br />443.97 °R <br /> | 25.1 | ||||||||||||||
| -18.1°C255.05 K <br />-0.58 °F <br />459.09 °R <br /> | 3.48 | ||||||||||||||
| 0°C273.15 K <br />32 °F <br />491.67 °R <br /> | 67 | 2.6 | 15 | 1.65 | |||||||||||
| 5.8°C278.95 K <br />42.44 °F <br />502.11 °R <br /> | 63.52 | ||||||||||||||
| 10°C283.15 K <br />50 °F <br />509.67 °R <br /> | 84 | 4 | 2 | 0.7 | |||||||||||
| 15°C288.15 K <br />59 °F <br />518.67 °R <br /> | |||||||||||||||
| 19.5°C292.65 K <br />67.1 °F <br />526.77 °R <br /> | 9.37 | ||||||||||||||
| 20°C293.15 K <br />68 °F <br />527.67 °R <br /> | 104.7 | 6.73 | 22 | 0.00056 | 21.53 | 2.56 | 2.6 | 6.2 | 1.2 | ||||||
| 24°C297.15 K <br />75.2 °F <br />534.87 °R <br /> | 107.6 | ||||||||||||||
| 25°C298.15 K <br />77 °F <br />536.67 °R <br /> | 6.2 | 0.96 | 0.08 | 44 | |||||||||||
| 30°C303.15 K <br />86 °F <br />545.67 °R <br /> | 136 | 7.2 | 3.6 | 1.6 | |||||||||||
| 35°C308.15 K <br />95 °F <br />554.67 °R <br /> | 97.043 | ||||||||||||||
| 40°C313.15 K <br />104 °F <br />563.67 °R <br /> | 165.4 | 9.16 | 4.8 | 2.1 | |||||||||||
| 50°C323.15 K <br />122 °F <br />581.67 °R <br /> | 205 | 11.7 | 6.2 | 119.7 | |||||||||||
| 60°C333.15 K <br />140 °F <br />599.67 °R <br /> | 246 | 15.1 | 62.8 | 7.7 | |||||||||||
| 70°C343.15 K <br />158 °F <br />617.67 °R <br /> | 314.6 | 20.2 | 9.8 | 172.32 | |||||||||||
| 80°C353.15 K <br />176 °F <br />635.67 °R <br /> | 400 | 12.3 | |||||||||||||
| 90°C363.15 K <br />194 °F <br />653.67 °R <br /> | 525 | 17 | 5.5 | ||||||||||||
| 98°C371.15 K <br />208.4 °F <br />668.07 °R <br /> | 18.06 | ||||||||||||||
| 100°C373.15 K <br />212 °F <br />671.67 °R <br /> | 733 |
Gallery
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Monocrystals grown from solution containing small amount of sulfuric acidUrea, Egor Kazakov, VKontakteVKontakte
-
UreaMaxim Martinov
Video
Sources
| Amides | |
|---|---|
|
Paracetamol (C8H9NO2) • Thiourea (CS(NH4)2) • Urea (CO(NH4)2) |
| Urea compounds | |
|---|---|
|
Hexakarbamatzinc sulfate ([(CON2H4)6Zn]SO4) • Nitratopentakis-karbamatbismuth(III) nitrate ([Bi(NO3)(CO(NH2)2)5](NO3)2) • Urea ((NH2)2CO) • Urea and sodium chloride complex (CO(NH4)2 · NaCl) • Urea citrate ((NH2)2CO · C6H8O7) |