Wikipedia:WikiProject Chemicals/Chembox validation/VerifiedDataSandbox and Zinc pyrophosphate: Difference between pages

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| Appearance = crystalline powder

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'''Zinc pyrophosphate''' (Zn₂P₂O₇) is an [[ionic compound|ionic]] [[inorganic compound|inorganic]] [[chemical compound]] composed of Zn²⁺ [[cation]]s and [[pyrophosphate]] [[anion]]s.

== Preparation ==

Zinc pyrophosphate can be obtained from the thermal decomposition of zinc ammonium phosphate.<ref name="Calvo">{{Cite journal|last=Calvo|first=Crispin|date=1965-05-01|title=THE CRYSTAL STRUCTURE AND PHASE TRANSITIONS OF β-Zn 2 P 2 O 7|journal=Canadian Journal of Chemistry|language=en|volume=43|issue=5|pages=1147–1153|doi=10.1139/v65-152|issn=0008-4042|doi-access=free}}</ref>

:2 ZnNH₄PO₄ → Zn₂P₂O₇ + 2 NH₃ + H₂O

It can also be obtained from the reaction between [[sodium carbonate]], [[zinc oxide]], and [[ammonium dihydrogen phosphate]].<ref name="Jarboui">{{Cite journal|last1=Jarboui|first1=A.|last2=Ben Rhaeim|first2=A.|last3=Hlel|first3=F.|last4=Guidara|first4=K|last5=Gargouri|first5=M.|date=2010|title=NMR study and electrical properties investigation of Zn2P2O7|url=http://link.springer.com/10.1007/s11581-009-0333-5|journal=Ionics|language=en|volume=16|issue=1|pages=67–73|doi=10.1007/s11581-009-0333-5|s2cid=94790682 |issn=0947-7047}}</ref>

:Na₂CO₃ + 2 ZnO + 2 (NH₄)H₂PO₄ → Zn₂P₂O₇ + 2 NaOH + 2 NH₃ + 2 H₂O + CO₂

It is also produced when a strongly acidic solution of [[zinc sulfate]] is heated with [[sodium pyrophosphate]].<ref>{{Cite book|last=Ochs|first=Rudolf|url=https://books.google.com/books?id=1hmBBwAAQBAJ&pg=PA117|title=Praktikum der Qualitativen Analyse Für Chemiker · Pharmazeuten und Mediziner|publisher=Springer-Verlag|year=2013|isbn=978-3-662-28315-8|location=Berlin, Heidelberg|pages=117|oclc=860357745}}</ref>

:2 ZnSO₄ + Na₄P₂O₇ → Zn₂P₂O₇ + 2 Na₂SO₄

Another method is precipitating zinc as a phosphate, then heating over 1123 K.{{Citation needed|date=May 2009}}

== Properties ==

Zinc pyrophosphate is a white crystalline solid that is insoluble in water.<ref name="Perry">{{Cite book|last=Perry|first=Dale L.|url=https://books.google.com/books?id=SFD30BvPBhoC&pg=PA469|title=Handbook of Inorganic Compounds|publisher=CRC Press|year=2016|isbn=978-1-4398-1462-8|edition=2nd|location=Boca Raton, FL|pages=469|oclc=759865801}}</ref> On heating in water, it decomposes to form Zn₃(PO₄)₂ and ZnHPO₄. It crystallizes in the monoclinic system. The α-form crystallizes at low temperatures and the β-form crystallizes at high temperatures.<ref name="Calvo"/><ref name="Jarboui"/>

== Uses ==

Zinc pyrophosphate is used as a pigment.<ref name="Perry"/> It is useful in [[gravimetric analysis]] of zinc.<ref>{{Cite book|last1=Holleman|first1=Arnold F.|title=Lehrbuch der anorganischen Chemie|last2=Wiberg|first2=Egon|last3=Wiberg|first3=Nils|publisher=de Gruyter|year=1995|isbn=978-3-11-012641-9|edition=102nd|location=Berlin|pages=1493|oclc=237142268}}</ref>

==References==

{{Reflist}}

{{Zinc compounds}}

[[Category:Pyrophosphate salts]]

[[Category:Zinc compounds|pyrophosphate]]

{{inorganic-compound-stub}}