Calcium hydroxychloride

{{distinguish|calcium hypochlorite}}

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| IUPACName = Calcium chloride hydroxide{{cite web | url=https://pubchem.ncbi.nlm.nih.gov/compound/Calcium-chloride-hydroxide-_1_1_1 | title=Calcium chloride hydroxide (1/1/1) }}

| OtherNames = {{ubl|Calcium chloride hydroxide (1/1/1)|Calcium hydroxychloride}}

|Section1={{Chembox Identifiers

| CASNo = 14031-58-4

| CASNo1 = 127886-77-5

| PubChem = 19779969

| StdInChI=1S/Ca.ClH.H2O/h;1H;1H2/q+2;;/p-2

| StdInChIKey = CTUDRLGCNRAIEA-UHFFFAOYSA-L

| SMILES = [OH-].[Cl-].[Ca+2]

| DTXSID = DTXSID60599844

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|Section2={{Chembox Properties

| Formula = Ca(OH)Cl

| Ca=1|O=1|H=1|Cl=1

| Appearance = white solid

| Density = 2.4 g/cm³{{cite journal |doi=10.3891/acta.chem.scand.35a-0467|title=X-Ray Investigations of Ammines of Alkaline Earth Metal Halides. I. The Structures of CaCl2(NH3)8, CaCl2(NH3)2 and the Decomposition Product CaClOH |year=1981 |last1=Westman |first1=Sven |last2=Werner |first2=Per-Erik |last3=Schuler |first3=Thomas |last4=Raldow |first4=Wiktor |last5=Nielsen |first5=P. H. |journal=Acta Chemica Scandinavica |volume=35a |pages=467–472 |doi-access=free}}

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| Section8 = {{Chembox Related

| OtherCompounds = {{ubl|Zinc chloride hydroxide monohydrate|Hibbingite|Magnesium hydroxychloride|Aluminium chlorohydrate|Cumengeite|Dicopper chloride trihydroxide}}

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Calcium hydroxychloride or calcium chloride hydroxide is an inorganic compound with the chemical formula {{chem2|Ca(OH)Cl|auto=1}}. It consists of calcium cations ({{chem2|Ca(2+)}}) and chloride ({{chem2|Cl−}}) and hydroxide ({{chem2|−OH}}) anions. A white solid, it forms by the reaction of hydrogen chloride with calcium hydroxide{{cite journal |doi=10.1016/j.tca.2004.04.011|title=Reaction of Ca(OH)2 with HCL in the presence of water vapour at low temperatures |year=2004 |last1=Bausach |first1=M. |last2=Krammer |first2=G. |last3=Cunill |first3=F. |journal=Thermochimica Acta |volume=421 |issue=1–2 |pages=217–223}} According to X-ray crystallography, it adopts a layered structure related to brucite (magnesium hydroxide, {{chem2|Mg(OH)2}}).{{cite journal |doi=10.1002/hlca.19610440329|title=Über die Hydroxidchloride Me(OH)Cl. (Me = Mg, Ni, Co, Cu, Zn, Fe, Mn, Cd, Ca, Sn) |year=1961 |last1=Oswald |first1=H. R. |last2=Feitknecht |first2=W. |journal=Helvetica Chimica Acta |volume=44 |issue=3 |pages=847–858}}

Calcium hydroxychloride is sometimes confused with calcium hypochlorite. Calcium hydroxychloride is a double salt, which consists of calcium cations {{chem2|Ca(2+)}} and two kinds of anions, chloride {{chem2|Cl−}} and hydroxide {{chem2|−OH}}, while calcium hypochlorite consists of calcium cations {{chem2|Ca(2+)}} and only one kind of anions, hypochlorite {{chem2|−OCl}}.

Calcium hydroxychloride may form on concrete roads and bridges as a consequence of the use of calcium chloride as a deicing agent. Calcium chloride reacts with calcium hydroxide (portlandite) present in cement hydration products and forms a deleterious expanding phase also named CAOXY (abbreviation for calcium oxychloride) by concrete technologists. The stress induced into concrete by crystallisation pressure and CAOXY salt expansion can considerably reduce the strength of concrete.{{cite web|url=http://theconversation.com/calcium-munching-bacteria-could-be-a-secret-weapon-against-road-salt-eating-away-at-concrete-roads-and-bridges-113970|title=Calcium-munching bacteria could be a secret weapon against road salt eating away at concrete roads and bridges|work=The Conversation|date=4 April 2019 |access-date=7 April 2019}}{{Cite journal|title=Calcium Oxychloride Formation Potential in Cementitious Pastes Exposed to Blends of Deicing Salt|author1=Suraneni, Prannoy|author2=Monical, Jonathan|author3=Unal, Erol|author4=Farnam, Yaghoob|author5=Weiss, Jason|year=2017|journal=ACI Materials Journal|volume=114|issue=4|doi=10.14359/51689607}}