Timbal(II) nitrat: Perbedaan antara revisi
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'''Timbal(II) nitrat''' adalah suatu [[senyawa anorganik]] dengan [[rumus kimia]] [[Timbal|Pb]]([[Nitrat|NO<sub>3</sub>]])<sub>2</sub>. Senyawa ini umumnya dijumpai sebagai [[kristal]] tak berwarna atau serbuk putih dan, tidak seperti kebanyakan [[garam (kimia)|garam]] timbal(II) lainnya, [[Kelarutan|larut]] dalam [[air]].
Senyawa ini telah dikenal sejak [[Abad Pertengahan]] dengan nama '''plumb dulcis''', produksi timbal(II) nitrat baik dari logam [[timbal]] maupun [[timbal(II) oksida|timbal oksida]] dalam [[asam nitrat]] merupakan produksi skala kecil, untuk digunakan langsung dalam pembuatan [[Senyawa anorganik berdasarkan unsur#Timbal (plumbum)|senyawa timbal]] lainnya. Pada abad ke-19 timbal(II) nitrat mulai diproduksi secara komersial di Eropa dan Amerika Serikat. Menurut catatan sejarah, penggunaan utamanya adalah sebagai bahan baku produksi [[pigmen]] untuk [[cat timbal]], tetapi cat sejenis ini sudah digantikan oleh cat yang lebih aman berbahan dasar [[titanium dioksida]]. Penggunaan industri lainnya mencakup [[stabilisator (kimia)|penstabil]] panas dalam [[nilon]] dan [[poliester]], dan sebagai pelapis kertas [[termografi|fototermografi]]. Sejak tahun 2000an,
Timbal(II) nitrat bersifat [[Toksisitas|toksik]], suatu [[oksidator]], dan digolongkan sebagai ''[[Daftar IARC Golongan 2A karsinogen|berpotensi karsinogenik pada manusia]]'' oleh [[Badan Internasional Penelitian Kanker]] (''International Agency for Research on Cancer''). Akibatnya, timbal(II) nitrat harus ditangani dan disimpan dengan tindakan pencegahan keselamatan yang memadai untuk mencegah terhirup, tertelan, dan terkena kulit. Oleh karena sifat alaminya yang berbahaya, aplikasi terbatas timbal (II) nitrat berada di bawah pengawasan ketat.
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Sejak [[Abad Pertengahan]], timbal(II) nitrat telah diproduksi sebagai bahan baku produksi pigmen berwarna dalam [[cat timbal]], seperti [[krom kuning]] (timbal(II) kromat), [[krom jingga]] (timbal(II) hidroksida kromat) dan [[Senyawa anorganik berdasarkan unsur#Timbal (plumbum)|senyawa timbal]] sejenis. Pigmen-pigmen ini digunakan untuk [[pewarnaan]] dan pencetakan [[Kaliko (tekstil)|kaliko]] dan tekstil lainnya.<ref name="pigments">{{cite book|title = A Text-book of Inorganic Chemistry|publisher = MacMillan|year = 1950|page = 838|first = James Riddick|last = Partington}}</ref>
Pada tahun 1597, [[
Proses produksi pernah dan masih mengikuti cara kimia sederhana, melarutkan [[timbal]] dalam ''aqua fortis'' ([[asam nitrat]]), dan secara berkala diambil [[Pengendapan (kimia)|endapannya]]. Namun, produksi tetap skala kecil selama berabad-abad, dan produksi komersial timbal(II) nitrat sebagai bahan baku untuk pembuatan senyawa timbal lainnya tidak dilaporkan sampai 1835.<ref name=britannica1911>{{cite web|url = http://www.1911encyclopedia.org/Lead|title = Lead|publisher = [[Encyclopædia Britannica Eleventh Edition]]|accessdate = 2006-10-11}}</ref><ref name=macgregor>{{cite book|first = John|last = Macgregor|title = Progress of America to year 1846|url = https://archive.org/details/cihm_51791|publisher = Whittaker & Co|location = London|year = 1847|isbn = 0-665-51791-2}}</ref> Pada tahun 1974, [[Amerika Serikat|A.S.]] mengkonsumsi senyawa timbal, tidak termasuk pigmen dan aditif [[bensin]], adalah 642 ton.<ref name="greenwood">{{cite book|
== Struktur ==
[[
[[Struktur kristal]] timbal(II) nitrat padat telah ditentukan menggunakan [[difraksi neutron]].<ref>{{cite journal|first = W.C.|last = Hamilton|title = A neutron crystallographic study of lead nitrate|journal = [[Acta Crystallographica|Acta Crystallogr.]]|year = 1957|volume = 10|pages = 103–107|doi = 10.1107/S0365110X57000304|issue = 2}}</ref><ref name="nowotny">{{cite journal|title = Structure refinement of lead nitrate|first = H.|last = Nowotny|author2=G. Heger |journal = [[Acta Crystallogr. C]]|year = 1986 |volume = 42|pages = 133–35|doi = 10.1107/S0108270186097032|issue = 2}}</ref> Senyawa [[Kristalisasi|mengkristal]] dalam sistem kubik dengan atom timbal dalam sistem [[Sistem kristal kubik|kubik pusat muka]]. [[Golongan ruang]]nya adalah Pa3<sub>Z=4</sub> (notasi [[kisi Bravais]]), yang masing-masing sisi kubus memiliki panjang 784 [[pikometer]].
Noktah hitam menggambarkan atom timbal, noktah putih gugus nitrat 27 pikometer di atas bidang atom timbal. Pada konfigurasi ini, setiap atom timbal [[Ikatan kimia|terikat dengan duabelas atom oksigen ([[panjang ikatan]]:281 pikometer). Semua panjang atom N–O juga sama pada 127&
Ketertarikan peneliti pada struktur kristal timbal(II) nitrat terutama didasarkan pada kemungkinan rotasi internal bebas gugus nitrat dalam kisi kristal pada kenaikan temperatur, tetapi ini hingga saat ini belum terbukti.<ref name="nowotny"/>
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Memungkinkan juga untuk mengekstrak nitrat dari bahan organik seperti [[pupuk]] atau [[urin]]. Ekstraksi nitrat menggunakan metode ini tidak sekuat nitrat berderajat kemurnian industri, tetapi dapat digunakan untuk produksi [[serbuk mesiu]].
Hampir semua timbal(II) nitrat yang tersedia secara komersial diproduksi sesuai dengan bahan skala [[laboratorium]].<ref name="adlam">{{cite book|last = Adlam|first = George Henry Joseph|author2=Price, Leslie Slater
Dalam perlakuan limbah timbal menggunakan asam nitrat, misalnya, dalam pengolahan limbah timbal-[[bismut]] dari pengilangan timbal, larutan tak murni timbal(II) nitrat dibuat sebagai [[produk sampingan]]. Larutan ini dilaporkan untuk digunakan dalam proses [[sianidasi emas]].<ref name="sidech">{{cite web|title = Product catalog; other products|url = http://www.sidech.be/products.html|publisher = Sidech|location = Tilly, Belgium|accessdate = 2008-01-05|archive-date = 2007-07-01|archive-url = https://web.archive.org/web/20070701013928/http://www.sidech.be/products.html|dead-url = yes}}</ref>
Apart from [[lead(II) acetate]], lead(II) nitrate is the only common soluble lead compound. Lead(II) nitrate readily [[solvation|dissolves]] in water to give a clear, colourless solution.<ref name="ferris">{{cite journal|first = L.M.|last = Ferris|title = Lead nitrate—Nitric acid—Water system|journal = Journal of Chemicals and Engineering Date|year = 1959|doi = 10.1021/je60007a002|volume = 5|pages = 242–242|issue = 3}}</ref> As an [[ionic compound|ionic substance]], the dissolution of lead(II) nitrate involves [[dissociation (chemistry)|dissociation]] into its constituent ions.▼
== Reaksi ==
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<center><math>\text{Pb(NO}_3\text{)}_{2(s)} \longrightarrow \text{Pb}_{(aq)}^{2+} + 2\text{NO}_{(aq)}^{3-}</math></center>
Timbal(II) nitrat membentuk larutan yang sedikit asam, dengan pH antara 3,0 sampai 4,0 untuk larutan 20% dalam air.<ref>http://www.mallbaker.com/americas/msds/english/L3130_msds_us_Default.pdf{{Pranala mati|date=Mei 2021 |bot=InternetArchiveBot |fix-attempted=yes }}</ref>
When concentrated [[sodium hydroxide]] solution is added to lead(II) nitrate solution, [[Alkali salt|basic nitrates]] are formed, even well past the [[equivalence point]]. Up through the half equivalence point, Pb(NO<sub>3</sub>)<sub>2</sub>·Pb(OH)<sub>2</sub> predominates, then after this point Pb(NO<sub>3</sub>)<sub>2</sub>·5Pb(OH)<sub>2</sub> is formed. No simple Pb(OH)<sub>2</sub> is formed up to at least [[pH]] 12.<ref name="kirkothmer">{{cite book|first = D.F.|last = Othmer|authorlink = Donald Othmer|title = Kirk-Othmer Encyclopedia of Chemical Technology|edition = second completely revised|volume = 12 (Iron to Manganese)|year = 1967|publisher = [[John Wiley & Sons]]|location = New York|pages = 272|isbn = 0-471-02040-0}}</ref><ref name="pauley">{{cite journal|title = Basic Salts of Lead Nitrate Formed in Aqueous Media|first = J. L.|last = Pauley|author2=M. K. Testerman |journal = [[Journal of the American Chemical Society]]|year = 1954|volume = 76|issue = 16|pages = 4220–4222|doi = 10.1021/ja01645a062}}</ref>▼
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Lead(II) nitrate is associated with interesting [[supramolecular chemistry]] because of its [[complex (chemistry)|coordination]] to [[nitrogen]] and [[oxygen]] electron-donating compounds. The interest is largely academic, but with several potential applications. For example, combining lead nitrate and [[diethylene glycol|pentaethylene glycol]] (EO<sub>5</sub>) in a solution of [[acetonitrile]] and [[methanol]] followed by slow [[evaporation]] produces a new crystalline material [Pb(NO<sub>3</sub>)<sub>2</sub>(EO<sub>5</sub>)].<ref>{{cite journal|title = Structural Chemistry of Poly (ethylene glycol). Complexes of Lead(II) Nitrate and Lead(II) Bromide|first = Robin D.|last = Rogers|author2=Andrew H. Bond |author3=Debra M. Roden |journal = [[Inorganic Chemistry (journal)|Inorg. Chem.]]|year = 1996|issue = 24|pages = 6964–6973|doi = 10.1021/ic960587b|volume = 35|pmid=11666874}}</ref> In the crystal structure for this compound, the EO<sub>5</sub> chain is wrapped around the lead ion in an [[Celestial sphere|equatorial plane]] similar to that of a [[crown ether]]. The two bidentate nitrate [[ligand]]s are in [[Cis-trans isomerism|trans configuration]]. The total [[coordination number]] is 10, with the lead ion in a bicapped [[square antiprism]] [[molecular geometry]].▼
=== Kompleksasi ===
The complex formed by lead(II) nitrate, [[lead(II) perchlorate]] and a [[thiazole|bithiazole]] bidentate N-donor ligand is binuclear, with a nitrate group bridging the lead atoms with coordination number of 5 and 6.<ref name=mahjoub>{{cite journal|title = A Dimeric Mixed-Anions Lead(II) Complex: Synthesis and Structural Characterization of [Pb<sub>2</sub>(BTZ)<sub>4</sub>(NO<sub>3</sub>)(H<sub>2</sub>O)](ClO<sub>4</sub>)<sub>3</sub> {BTZ = 4,4'-Bithiazole}|first = Ali Reza|last = Mahjoub|author2 = Ali Morsali|journal = [[Chemistry Letters]]|volume = 30|issue = 12|year = 2001|page= 1234|doi=10.1246/cl.2001.1234}}</ref> One interesting aspect of this type of complexes is the presence of a physical gap in the [[coordination sphere]]; i.e., the ligands are not placed symmetrically around the metal ion. This is potentially due to a lead [[lone pair]] of electrons, also found in lead complexes with an [[imidazole]] ligand.<ref name=wan>{{cite journal|title = 2D 4.8<sup>2</sup> Network with threefold parallel interpenetration from nanometre-sized tripodal ligand and lead(II) nitrate|authors = Shuang-Yi Wan, Jian Fan, Taka-aki Okamura, Hui-Fang Zhu, Xing-Mei Ouyang, Wei-Yin Sun and Norikazu Ueyama|journal = [[Chemical Communications|Chem. Commun.]]|year = 2002|pages = 2520–2521|doi = 10.1039/b207568g|issue = 21}}</ref>▼
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Jenis kimia ini tidak unik hanya untuk garam nitrat; senyawa timbal(II) lainnya seperti [[timbal(II) bromida]] juga membentuk kompleks, tetapi senyawa nitratnya sering digunakan karena kelarutannya dan sifat bidentatnya.
Lead(II) nitrate is an [[oxidizing agent]]. Depending on the reaction, this may be due to the Pb<sup>2+</sup>(aq) ion, which has a standard [[reduction potential]] (E<sup>0</sup>) of −0.125 V, or the nitrate ion, which under acidic conditions has an E<sup>0</sup> of +0.956 V.<ref name="HillPetrucci">{{cite book|title = General Chemistry|publisher = Prentice Hall|location = Upper Saddle River, New Jersey|year = 1999|page = 781|first = John W.|last = Hill|author2=Petrucci, Ralph H. |edition = 2nd|isbn = 0-13-010318-7}}</ref> The nitrate would function at high temperatures or in an acidic condition, while the lead(II) works best in a neutral aqueous solution.▼
=== Oksidasi dan dekomposisi ===
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Ketika dipanaskan, kristal timbal(II) nitrat terdekomposisi menjadi [[timbal(II) oksida]], [[Oksigen#alotropi|oksigen]] dan [[nitrogen dioksida]].
<center><math>2\text{ Pb(NO}_3\text{)}_{2(s)} \longrightarrow 2\text{ PbO}_{(s)} + 4\text{NO}_{2(g)} + \text{O}_{2(g)}</math></center>
Oleh karena sifat ini, timbal nitrat sering digunakan dalam [[piroteknik]] seperti [[kembang api]].<ref name="pyrotechnica"/>
Due to the hazardous nature of lead(II) nitrate, there is a preference for using alternatives in industrial applications. In the formerly major application of [[lead paint]]s, it has largely been replaced by [[titanium dioxide]].<ref name="millennium">{{cite web|url = http://www.millenniumchem.com/Products+and+Services/Products+by+Type/Titanium+Dioxide+-+Paint+and+Coatings/r_TiO2+Fundamentals/Historical+Development+of+Titanium+Dioxide_EN.htm |title = Historical development of titanium dioxide|publisher = Millennium Inorganic Chemicals|accessdate = 2008-01-04|archiveurl = http://web.archive.org/web/20071021023341/http://www.millenniumchem.com/Products+and+Services/Products+by+Type/Titanium+Dioxide+-+Paint+and+Coatings/r_TiO2+Fundamentals/Historical+Development+of+Titanium+Dioxide_EN.htm |archivedate = October 21, 2007}}</ref> Other historical applications of lead(II) nitrate, such as in matches and fireworks, have declined or ceased as well. Current applications of lead(II) nitrate include use as a heat stabiliser in nylon and polyesters, as a coating for [[thermography|photothermographic]] paper, and in [[rodenticide]]s.<ref name="greenwood"/>▼
== Aplikasi ==
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Pada skala laboratorium, timbal(II) nitrat merupakan salah satu dari dua sumber [[dinitrogen tetroksida]] yang mudah dan dapat diandalkan. Mengeringkan timbal(II) nitrat dengan hati-hati dan kemudian memanaskannya dalam sebuah bejana baja, dihasilna [[nitrogen dioksida]], yang mengalami dimerisasi menjadi senyawa yang diinginkan.
<center><math>2\text{ NO}_2 \rightleftharpoons \text{N}_2\text{O}_4</math></center>
To improve the [[Tank leaching|leaching]] process in the [[gold cyanidation]], lead(II) nitrate solution is added. Although a bulk process, only limited amounts (10 to 100 milligrams lead(II) nitrate per kilogram gold) are required.<ref>{{cite book|first = Fathi|last = Habashi|title = Recent advances in gold metallurgy|year = 1998 |journal=Revisa de la Facultad de Ingeniera, Universidad Central de Venezuela|volume=13|issue=2|pages=43–54}}</ref><ref>{{cite web|url = http://www.e-goldprospecting.com/html/auxiliary_agents_in_gold_cyani.html|title = Auxiliary agents in gold cyanidation|publisher = Gold Prospecting and Gold Mining|accessdate = 2008-01-05}}</ref> Both the cyanidation itself, as well as the use of lead compounds in the process, are deemed controversial due to the compounds' toxic nature.▼
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Dalam kimia organik, timbal(II) nitrat telah digunakan sebagai oksidan, misalnya sebagai suatu alternatif dari [[reaksi Sommelet]] untuk oksidasi [[benzil]] halida menjadi aldehida.<ref name=SchulzeBerichte1884>{{cite journal |last = Schulze
| first = K. E. |title = Über α- und β-Methylnaphtalin
| journal = [[Berichte der deutschen chemischen Gesellschaft|Chemische Berichte]]
| volume = 17|page = 1530|year = 1884|doi=10.1002/cber.188401701384}}</ref>
{{OrgSynth|author = Rapoport, H.; Jamison, T.|collvol = 9|collvolpages = 344|prep = cv9p0344|year = 1998|title = (S)-N-(9-Phenylfluoren-9-yl)alanine and (S)-Dimethyl-N-(9-phenylfluoren-9-yl)aspartate}}</ref>
==
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== Lihat juga ==
{{portal|Kimia}}
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== Pranala luar ==
{{Commons category|Lead(II) nitrate|Timbal(II) nitrat}}
* {{cite journal|last = Woodbury|first = William D.|title = Lead|url = http://digicoll.library.wisc.edu/cgi-bin/EcoNatRes/EcoNatRes-idx?type=article&did=ECONATRES.MINYB1982V1.WWOODBURY&isize= |journal = Mineral yearbook metals and minerals|year = 1982|publisher = [[United States Bureau of Mines|Bureau of Mines]]|pages = 515–42|accessdate = 2008-01-18}}
* {{cite journal|title = Lead|url = http://www.cdc.gov/niosh/npg/npgd0368.html|publisher = National Institute for Occupational Safety and Health|journal = NIOSH Pocket Guide to Chemical Hazards|date=September 2005|id = NIOSH 2005-149| accessdate = 2008-01-19}}
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;Lembar Data Keselamatan Bahan (MSDS)
* [http://physchem.ox.ac.uk/MSDS/LE/lead_nitrate.html MSDS timbal nitrat, PTCL, Oxford University] {{Webarchive|url=https://web.archive.org/web/20070916040907/http://physchem.ox.ac.uk/MSDS/LE/lead_nitrate.html |date=2007-09-16 }}
* {{PDFlink|[http://www.proscitech.com.au/cataloguex/msds/c151.pdf MSDS for lead nitrate, ProSciTech]|126 [[Kibibyte|KiB]]<!-- application/pdf, 129167 bytes -->}}
* [http://www.sciencestuff.com/msds/C1980.html MSDS timbal nitrat, Science Stuff Inc] {{Webarchive|url=https://web.archive.org/web/20060328120306/http://www.sciencestuff.com/msds/C1980.html |date=2006-03-28 }}
* [http://avogadro.chem.iastate.edu/MSDS/Pb(NO3)2.htm MSDS timbal nitrat, Iowa State University] {{Webarchive|url=https://web.archive.org/web/20060504233922/http://avogadro.chem.iastate.edu/MSDS/Pb(NO3)2.htm |date=2006-05-04 }}
* [https://srmors.nist.gov/msds/view_msds2pdf.cfm?msds=991 MSDS timbal nitrat, NIST]{{Pranala mati|date=Maret 2021 |bot=InternetArchiveBot |fix-attempted=yes }}
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