Cerium(IV) hydroxide
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| Name =
| ImageFile = Ce hydroxide.jpg
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| IUPACName = cerium(4+);tetrahydroxide
| OtherNames = ceric hydroxide
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| Section1 = {{Chembox Identifiers
| CASNo = 12014-56-1
| CASNo_Ref = {{cascite|correct|CAS}}
| PubChem = 10219931
| ChemSpiderID = 21171175
| UNII = 20GT4M7CWG
| EINECS = 234-599-7
| StdInChI=1S/Ce.4H2O/h;4*1H2/q+4;;;;/p-4
| StdInChIKey = WTVAYLQYAWAHAX-UHFFFAOYSA-J
| SMILES = [OH-].[OH-].[OH-].[OH-].[Ce+4]
}}
| Section2 = {{Chembox Properties
| Formula = Ce(OH)4
| MolarMass =
| Appearance = bright yellow solid
| Density =
| MeltingPt =
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| Section3 = {{Chembox Hazards
| MainHazards = Not classified as hazardous
| ExternalSDS =
| FlashPt =
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| Section8 = {{Chembox Related
| OtherFunction =
| OtherAnions =
| OtherCations = lanthanum hydroxide
praseodymium hydroxide
| OtherCompounds = cerium(III) hydroxide
cerium dioxide
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Cerium(IV) hydroxide, also known as ceric hydroxide, is an inorganic compound with the chemical formula Ce(OH)4. It is a yellowish powder that is insoluble in water but soluble in concentrated acids.{{Cite book|last=Perry|first=Dale L.|title=Handbook of Inorganic Compounds|publisher=CRC Press|year=2011|isbn=978-1-43-981461-1|pages=104}}
Production
Cerium(IV) hydroxide can be produced by reacting cerium(III) carbonate and acetic acid, then oxidizing it with hydrogen peroxide in base. The reactions are:钟学明,邓安民,舒红英 等. 氢氧化铈合成的新方法. 过程工程学报. 2005.2. 5(1):74-77
: Ce2(CO3)3 + 6 CH3COOH → 2 Ce(CH3COO)3 + 3 CO2↑ + 3 H2O
: 2 Ce(CH3COO)3 + 3 H2O2 + 4 H2O → 2 Ce(OH)3(OOH) + 6 CH3COOH
: CH3COOH + NaOH → CH3COONa + H2O
: 2 Ce(OH)3(OOH) → 2 Ce(OH)4↓ + O2↑
The net equation is：
: Ce2(CO3)3 + 6 CH3COOH + 3 H2O2 + 6 NaOH —343 K→ 2 Ce(OH)4 + 6 CH3COONa + O2↑ + 3 CO2↑ + 5 H2O
If using cerium(III) nitrate as ingredient, a similar reaction occurs:李月红，李树胜，方中心. 高纯氢氧化铈生产工艺研究. 无机盐工业. 2011.9. 43(9): 40-42
: 2 Ce(NO3)3 + 3 H2O2 + 6 NH3·H2O → 2 Ce(OH)3(OOH)↓ + 6 NH4NO3 + 2 H2O
: 2 Ce(OH)3(OOH) —Δ→ 2 Ce(OH)4↓ + O2↑
It might also prepared by addition of sodium hydroxide or ammonium hydroxide to a Ce4+ solution, being obtained as a gelatinous precipitate described as CeO2·xH2O, (x = 0.5–2). Boiling an insoluble Ce4+ salt in NaOH gives granular Ce(OH)4.