Difference between revisions of "Biuret"

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| Name = Biuret
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| Reference =
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| IUPACName = Carbamoylurea
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| PIN = 2-Imidodicarbonic diamide
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| SystematicName = (Carbamoylamino)methanamide
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| OtherNames = Allophanamide<br>Carbamylurea<br>Allophanic acid amide<br>Allophanimidic acid<br>N-Carbamoylaminomethanamide<br>Ureidoformamide<br>Imidodicarbonic diamide
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| Section1 = {{Chembox Identifiers
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| Section2 = {{Chembox Properties
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| AtmosphericOHRateConstant =
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| Appearance = White crystalline solid
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| BoilingPt =
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| BoilingPtC =
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| BoilingPt_ref =
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| BoilingPt_notes = Decomposes
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| Density = 1.456 g/cm<sup>3</sup> (at 20 °C)
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| Formula = C<sub>2</sub>H<sub>5</sub>N<sub>3</sub>O<sub>2</sub>
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| HenryConstant =
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| MolarMass = 103.08 g/mol
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| MeltingPt =
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| MeltingPtC = 190
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| MeltingPt_notes = (decomposes)
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| Odor = Odorless
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| pKa =
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| Solubility = 1.23 g/100 ml (at 0 °C)<br>2.01 g/100 ml (at 25 °C)<br>4.59 g/100 ml (at 40 °C)<br>7.0 g/100 ml (at 50 °C)<br>17.5 g/100 ml (at 70 °C)<br>20.0 g/100 ml (at 75 °C)<br>53.5 g/100 ml (at 105.5 °C)<ref>de Malde; Chimica e l'Industria (Milan, Italy); vol. 38; (1956); p. 571-574</ref><ref>Rollet; Cohen-Adad; Comptes Rendus Hebdomadaires des Seances de l'Academie des Sciences; vol. 232; (1951); p. 2214,</ref><ref>The Merck Index. 9th ed. Rahway, New Jersey: Merck & Co., Inc., 1976., p. 170</ref>
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| SolubleOther = Soluble in alcohol<br>Slightly soluble in [[diethyl ether]]
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| DeltaHc = −940.1–−935.9 kJ·mol<sup>−1</sup>
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| DeltaHf = −565.8–−561.6 kJ·mol<sup>−1</sup>
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| Entropy = 146.1 J·K<sup>−1</sup>·mol<sup>−1</sup>
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| HeatCapacity = 131.3 J·K<sup>−1</sup>·mol<sup>−1</sup>
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| Section6 = {{Chembox Hazards
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| AutoignitionPt =
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| ExternalMSDS = [http://www.cdhfinechemical.com/images/product/msds/37_862542863_Biuret-CASNO-108-19-0-MSDS.pdf CDH Fine Chemical]
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| MainHazards = Irritant
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| OtherCompounds = [[Urea]]
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''Biuret'' is a chemical compound with the chemical formula C2H5N3O2. It is also known as carbamylurea. It is the result of condensation of two molecules of urea and is a problematic impurity in urea-based fertilizers [https://en.wikipedia.org/wiki/Biuret Wikipedia]
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'''Biuret''' is a chemical compound with the chemical formula '''C<sub>2</sub>H<sub>5</sub>N<sub>3</sub>O<sub>2</sub>'''. It is also known as '''carbamylurea'''. It is the result of condensation of two molecules of [[urea]] and is a problematic impurity in urea-based fertilizers <ref>https://en.wikipedia.org/wiki/Biuret</ref>
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==Properties==
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===Chemical===
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Biuret is prepared by the thermally catalyzed condensation of molten [[urea]] to biuret and [[ammonia]].
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It is not to be confused with Biuret reagent, a protein testing solution.  Biuret gives a positive result with [[Biuret reagent]], wherefore the name.
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===Physical===
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==Availability==
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Biuret can be found as a contaminant in urea-based fertilizers.
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==Preparation==
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Biuret can be made through thermal decomposition of urea.
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==Projects==
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*Make biuret hydrochloride
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*Make biuret nitrate
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==Handling==
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===Safety===
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Biuret is practically non-toxic and it's even used as non-protein nitrogen food for livestock.
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Powdered biuret is irritant.
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===Storage===
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In closed bottles, away from acidic vapors.
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===Disposal===
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No special disposal is required. If not contaminated with hazardous materials, can be dumped in ground as fertilizer.
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==References==
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<references/>
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===Relevant Sciencemadness threads===
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*[http://www.sciencemadness.org/talk/viewthread.php?tid=28481 Biuret ?]
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*[http://www.sciencemadness.org/talk/viewthread.php?tid=26306 Thermal Decomposition of Urea - Products?]
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[[Category:Chemical compounds]]
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[[Category:Organic compounds]]
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[[Category:Bases]]
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[[Category:Organic bases]]
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[[Category:Amines]]

Latest revision as of 15:39, 7 May 2017

Biuret
Names
IUPAC name
Carbamoylurea
Preferred IUPAC name
2-Imidodicarbonic diamide
Systematic IUPAC name
(Carbamoylamino)methanamide
Other names
Allophanamide
Carbamylurea
Allophanic acid amide
Allophanimidic acid
N-Carbamoylaminomethanamide
Ureidoformamide
Imidodicarbonic diamide
Properties
C2H5N3O2
Molar mass 103.08 g/mol
Appearance White crystalline solid
Odor Odorless
Density 1.456 g/cm3 (at 20 °C)
Melting point 190 °C (374 °F; 463 K) (decomposes)
Boiling point Decomposes
1.23 g/100 ml (at 0 °C)
2.01 g/100 ml (at 25 °C)
4.59 g/100 ml (at 40 °C)
7.0 g/100 ml (at 50 °C)
17.5 g/100 ml (at 70 °C)
20.0 g/100 ml (at 75 °C)
53.5 g/100 ml (at 105.5 °C)[1][2][3]
Solubility Soluble in alcohol
Slightly soluble in diethyl ether
Thermochemistry
146.1 J·K−1·mol−1
−565.8–−561.6 kJ·mol−1
Hazards
Safety data sheet CDH Fine Chemical
Related compounds
Related compounds
 Urea
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references
Stub.png This article is a stub. Please help Sciencemadness Wiki by expanding it, adding pictures, and improving existing text.

Biuret is a chemical compound with the chemical formula C2H5N3O2. It is also known as carbamylurea. It is the result of condensation of two molecules of urea and is a problematic impurity in urea-based fertilizers [4]

Properties

Chemical

Biuret is prepared by the thermally catalyzed condensation of molten urea to biuret and ammonia.

It is not to be confused with Biuret reagent, a protein testing solution. Biuret gives a positive result with Biuret reagent, wherefore the name.

Physical

Availability

Biuret can be found as a contaminant in urea-based fertilizers.

Preparation

Biuret can be made through thermal decomposition of urea.

Projects

  • Make biuret hydrochloride
  • Make biuret nitrate

Handling

Safety

Biuret is practically non-toxic and it's even used as non-protein nitrogen food for livestock.

Powdered biuret is irritant.

Storage

In closed bottles, away from acidic vapors.

Disposal

No special disposal is required. If not contaminated with hazardous materials, can be dumped in ground as fertilizer.

References

  1. ↑ de Malde; Chimica e l'Industria (Milan, Italy); vol. 38; (1956); p. 571-574
  2. ↑ Rollet; Cohen-Adad; Comptes Rendus Hebdomadaires des Seances de l'Academie des Sciences; vol. 232; (1951); p. 2214,
  3. ↑ The Merck Index. 9th ed. Rahway, New Jersey: Merck & Co., Inc., 1976., p. 170
  4. ↑ https://en.wikipedia.org/wiki/Biuret

Relevant Sciencemadness threads

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