Von Staudt–Clausen theorem: Difference between revisions

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{{Refimprove|date=August 2011}}
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{{chembox
| verifiedrevid = 464390969
| ImageFile = Chlorid stříbrný.PNG
| ImageFile1 = Silver-chloride-3D-ionic.png
| ImageSize1 =
| IUPACName = Silver(I) chloride
| OtherNames = cerargyrite<br />[[chlorargyrite]]<br />horn silver
| Section1 = {{Chembox Identifiers
| Abbreviations =
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| ChemSpiderID = 22967
| UNII_Ref = {{fdacite|correct|FDA}}
| UNII = MWB0804EO7
| StdInChI_Ref = {{stdinchicite|correct|chemspider}}
| StdInChI = 1S/Ag.ClH/h;1H/q+1;/p-1
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
| StdInChIKey = HKZLPVFGJNLROG-UHFFFAOYSA-M
| InChIKey1 = HKZLPVFGJNLROG-UHFFFAOYSA-M
| CASNo = 7783-90-6
| CASNo_Ref = {{cascite|correct|CAS}}
| EINECS =
| PubChem = 24561
| SMILES = Cl[Ag]
| InChI = 1S/Ag.ClH/h;1H/q+1;/p-1
| RTECS = VW3563000
| MeSHName =
| ChEBI_Ref = {{ebicite|correct|EBI}}
| ChEBI = 30341
| KEGG_Ref = {{keggcite|correct|kegg}}
| KEGG =
| ATCCode_prefix =
| ATCCode_suffix =
| ATC_Supplemental =}}
| Section2 = {{Chembox Properties
| Ag=1 | Cl=1
| Appearance = White Solid
| Density = 5.56 g cm<sup>&minus;3</sup>
| MeltingPtC = 455
| Melting_notes =
| BoilingPtC = 1547
| Boiling_notes =
| Solubility = 520 μg/100 g at 50 °C
| SolubleOther =
soluble in [[ammonia|NH<sub>3</sub>]], conc. [[hydrochloric acid|HCl]], conc. [[sulfuric acid|H<sub>2</sub>SO<sub>4</sub>]], alkali [[cyanide]], [[ammonium carbonate|NH<sub>4</sub>CO<sub>3</sub><sup>?</sup>]], [[potassium bromide|KBr]], [[sodium thiosulfate|Na<sub>2</sub>S<sub>2</sub>O<sub>3</sub>]];<br />
insoluble in [[alcohol]], dilute [[acid]]s.
| RefractIndex = 2.071
| pKa =
| pKb = }}
| Section3 = {{Chembox Structure
| CrystalStruct = [[Halite structure|halite]]
| Coordination =
| MolShape = }}
| Section4 = {{Chembox Thermochemistry
| DeltaHf = −127&nbsp;kJ·mol<sup>−1</sup><ref name=b1>{{cite book| author = Zumdahl, Steven S.|title =Chemical Principles 6th Ed.| publisher = Houghton Mifflin Company| year = 2009| isbn = 0-618-94690-X|page=A23}}</ref>
| Entropy = 96&nbsp;J·mol<sup>−1</sup>·K<sup>−1</sup><ref name=b1/>
}}
| Section5 = {{Chembox Pharmacology
| AdminRoutes =
| Bioavail =
| Metabolism =
| HalfLife =
| ProteinBound =
| Excretion =
| Legal_status =
| Legal_US =
| Legal_UK =
| Legal_AU =
| Legal_CA =
| PregCat =
| PregCat_AU =
| PregCat_US = }}
| Section6 = {{Chembox Explosive
| ShockSens =
| FrictionSens =
| ExplosiveV =
| REFactor = }}
| Section7 = {{Chembox Hazards
| ExternalMSDS = [https://fscimage.fishersci.com/msds/20787.htm Fischer Scientific]
| ExternalMSDS = [http://www.saltlakemetals.com/MSDS_Silver_Chloride.htm Salt Lake Metals]
| EUClass =
| EUIndex =
| MainHazards =
| NFPA-H = 2
| NFPA-F = 0
| NFPA-R = 0
| NFPA-O =
| RPhrases =
| SPhrases =
| RSPhrases =
| FlashPt =
| Autoignition =
| ExploLimits =
| PEL = }}
| Section8 = {{Chembox Related
| OtherAnions = [[silver(I) fluoride]], [[silver bromide]], [[silver iodide]]
| OtherCations =
| OtherFunctn =
| Function =
| OtherCpds = }}
 
}}
 
'''Silver chloride''' is a [[chemical compound]] with the [[chemical formula]] [[Silver|Ag]][[Chlorine|Cl]]. This white [[crystal]]line solid is well known for its low [[solubility]] in [[water]] (this behavior being reminiscent of the chlorides of Tl<sup>+</sup> and Pb<sup>2+</sup>). Upon illumination or heating, silver chloride converts to silver (and chlorine), which is signaled by greyish or purplish coloration to some samples. AgCl occurs naturally as a mineral [[chlorargyrite]].
 
==Preparation==
Silver chloride is easily synthesized by combining aqueous solutions of silver nitrate and sodium chloride.
:AgNO<sub>3(aq)</sub> + NaCl<sub>(aq)</sub> → AgCl<sub>(s)</sub> + NaNO<sub>3(aq)</sub>
 
==Structure and reactions==
[[Image:AgCl crystalline.jpg|thumb|left|Silver Chloride Crystals]]
[[Image:AgCl pyramidal.jpg|thumb|left|Pyramidal Crystals of AgCl]]
The solid adopts the [[Face-centered cubic|''fcc'']] [[Sodium chloride|NaCl]] structure, in which each Ag<sup>+</sup> ion is surrounded by an [[octahedron]] of six chloride ligands. [[Silver(I) fluoride|AgF]] and [[Silver bromide|AgBr]] crystallize similarly.<ref>Wells, A.F. (1984) Structural Inorganic Chemistry, Oxford: Clarendon Press. ISBN 0-19-855370-6.</ref> However, the crystallography depends on the condition of crystallization, primarily free silver ion concentration, as is shown on the pictures left (greyish tint and metallic [[lustre (mineralogy)|lustre]] are due to partly [[redox|reduce]]d [[silver]]). AgCl dissolves in solutions containing [[ligand]]s such as [[chloride]], [[cyanide]], [[triphenylphosphine]], [[thiosulfate]], [[thiocyanate]] and [[ammonia]]. Silver chloride reacts with these ligands according to the following illustrative equations:
:AgCl(s) + Cl<sup>−</sup>(aq) → AgCl<sub>2</sub><sup>−</sup>(aq)
 
:AgCl(s) + 2S<sub>2</sub>O<sub>3</sub><sup>2−</sup>(aq) → [Ag(S<sub>2</sub>O<sub>3</sub>)<sub>2</sub>]<sup>3−</sup>(aq) + Cl<sup>−</sup>(aq)
 
:AgCl(s) + 2NH<sub>3</sub>(aq) → [Ag(NH<sub>3</sub>)<sub>2</sub>]<sup>+</sup>(aq) + Cl<sup>−</sup>(aq)
Most complexes derived from AgCl are two-, three-, and, in rare cases, four-coordinate, adopting linear, trigonal planar, and tetrahedral coordination geometries, respectively.
 
==Chemistry==
[[File:Decomposition of Silver Chloride.jpg|thumb|left|Silver chloride decomposes over time with exposure to UV light]]
In one of the most famous reactions in chemistry, addition of colorless aqueous [[silver nitrate]] to an equally colorless solution of sodium chloride produces an opaque white precipitate of AgCl:<ref>[http://www.epa.gov/sw-846/pdfs/9076.pdf More info on Chlorine test]</ref>
:Ag<sup>+</sup>([[aqueous|aq]]) + Cl<sup>−</sup>(aq) → AgCl([[solid|s]])
This conversion is a common test for the presence of [[chloride]] in solution. Due to its conspicuousness it is easily used in titration, which gives the typical case of [[argentometry]].
 
The [[solubility product]], ''K''<sub>sp</sub>, for AgCl in water is 1.77 &times; 10<sup>&minus;10</sup> at room temperature, which indicates that only 1.9&nbsp;mg (<math>\sqrt{1.77 * 10^{-10}}</math> moles) of AgCl will dissolve in each liter of water. The chloride content of an aqueous solution can be determined quantitatively by weighing the precipitated AgCl, which conveniently is non-hygroscopic, since AgCl is one of the few transition metal chlorides that is unreactive toward water. Ions that interfere with this test are bromide and iodide, as well as a variety of ligands (see [[silver halide]]). For AgBr and AgI, the ''K''<sub>sp</sub> values are 5.2 x 10<sup>−13</sup> and 8.3 x 10<sup>−17</sup>, respectively. The [[silver bromide]] (slightly yellowish white) and [[silver iodide]] (pale yellow) are also significantly more photosensitive than is AgCl.
 
AgCl quickly darkens on exposure to light by disintegrating into elemental [[chlorine]] and metallic [[silver]]. This reaction is used in photography and film.
 
==Uses==
{{unreferenced-section|date=September 2012}}
*The [[silver chloride electrode]] is a common reference electrode in [[electrochemistry]].
*Silver chloride's low solubility makes it a useful addition to pottery glazes for the production of "Inglaze [[lustre (mineralogy)|lustre]]".
*Silver chloride has been used as an antidote for [[mercury poisoning]], assisting in the elimination of [[mercury (element)|mercury]].
*Silver chloride is used:
** to make [[photographic paper]] since it reacts with photons to form [[latent image]] and via photoreduction
** in [[photochromic lenses]], again taking advantage of its reversible conversion to Ag metal
** in [[bandage]]s and wound healing products
** to create yellow, amber, and brown shades in [[stained glass]] manufacture
** as an [[infra-red]] transmissive optical component as it can be hot-pressed into window and lens shapes<ref>[http://www.crystran.co.uk/silver-chloride-agcl.htm Crystran Data Sheet and Application]</ref>
** as an antimicrobial agent:
*** in some personal deodorant products
*** for long-term preservation of drinking water in water tanks
 
==References==
{{Reflist}}
 
{{Silver compounds}}
 
{{DEFAULTSORT:Silver Chloride}}
[[Category:Chlorides]]
[[Category:Silver compounds]]
[[Category:Metal halides]]
[[Category:Coordination compounds]]
[[Category:Photographic chemicals]]
[[Category:Light-sensitive chemicals]]

Revision as of 21:22, 4 March 2014

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