Lead(II) iodate

Lead(II) Iodate
Names
	IUPAC name diiodyloxylead
	Other names Lead(II) iodate
Identifiers
CAS Number	25659-31-8;
3D model (JSmol)	Interactive image;
Beilstein Reference	108301 (G)
ChemSpider	21173032;
ECHA InfoCard	100.042.866
EC Number	247-168-3;
PubChem CID	24884402;
	InChI Key: DRHWBADNSVQEGH-UHFFFAOYSA-L; InChI=1S/2HIO3.Pb/c22-1(3)4;/h2(H,2,3,4);/q;;+2/p-2;
	SMILES [O-]I(=O)=O.[O-]I(=O)=O.[Pb+2];
Properties
Chemical formula	Pb(IO3)2
Molar mass	557.01 g/mol
Appearance	white crystal powder
Density	6.5 g/cm3
Melting point	300 °C (572 °F; 573 K)
Solubility in water	3.61·10−5 M
Solubility product (Ksp)	3.69·10−13
Magnetic susceptibility (χ)	−131·10−6 cm3/mol
Structure
Crystal structure	orthorhombic
Thermochemistry
Std molar; entropy (S⦵298)	312.9632 J/(mol·K)
Std enthalpy of; formation (ΔfH⦵298)	−495.3856 kJ/mol
Pharmacology
	Pharmacokinetics:
Metabolism	Ingestion limit: 50 μg/m3
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	oxidizer
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H272, H302, H332, H360, H373, H410
Precautionary statements	P203, P210, P220, P260, P261, P264, P270, P271, P273, P280, P301+P317, P304+P340, P317, P318, P319, P330, P370+P378, P391, P405, P501
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Lead(II) iodate is an inorganic compound with the molecular formula Pb(IO₃)₂. It is naturally found as heavy white powder.

Production

One way to produce lead(II) iodate involves the reaction of lead nitrate with double moles of potassium iodate. Lead iodate can be precipitated precisely by simultaneous dropwise addition of equivalent solutions of lead nitrate and potassium iodate with water as a solvent at around 60 °C.^[1]

Pb(NO₃)₂(aq) + KIO₃(aq) → KNO₃(aq) + Pb(IO₃)₂(s)

Industrial mass production methods use a less precise method due to higher quantities of reactants. Many other group 1 elements can be used in place of potassium to add iodate to the reaction due to solubility of group 1 element iodates.

Uses

One use for the compound lead(II) iodate is the volumetric determination of lead content in ore. The determination of lead content in a sample of ore begins with the precipitation and separation of lead as a sulfate. The solution of this lead sulfate product is then slightly acidified and the lead is precipitated out as lead(II) iodate out by adding potassium iodate. Lead(II) iodate can then be titrated in the presence of hydrochloric acid and chloroform to indicate the exact amount of lead that was dissolved from the original ore sample. In this chemical process lead(II) iodate is used to isolate the lead found in a sample of ore from other chemicals present so that it can be studied and quantitated effectively.^[4]

PbSO₄(aq) + KIO₃(aq) → K₂SO₄(aq) + Pb(IO₃)₂(s)

References

^ ^a ^b Mer, Victor K. La; Goldman, Frederick H. (1930-07-01). "The Solubility of Lead Iodate in Water and in 0.1 N Salt Solutions". Journal of the American Chemical Society. 52 (7): 2791–2793. doi:10.1021/ja01370a032. ISSN 0002-7863.
^ ^a ^b ^c CRC handbook of chemistry and physics : a ready-reference book of chemical and physical data. William M. Haynes, David R. Lide, Thomas J. Bruno (2016-2017, 97th ed.). Boca Raton, Florida. 2016. ISBN 978-1-4987-5428-6. OCLC 930681942.{{cite book}}: CS1 maint: location missing publisher (link) CS1 maint: others (link)
^ "Lead iodate". pubchem.ncbi.nlm.nih.gov.
^ The Journal of Industrial and Engineering Chemistry. American Chemical Society. 1914. p. 399.{{cite book}}: CS1 maint: date and year (link)

[:0-1] Mer, Victor K. La; Goldman, Frederick H. (1930-07-01). "The Solubility of Lead Iodate in Water and in 0.1 N Salt Solutions". Journal of the American Chemical Society. 52 (7): 2791–2793. doi:10.1021/ja01370a032. ISSN 0002-7863.

[CRC97-2] CRC handbook of chemistry and physics : a ready-reference book of chemical and physical data. William M. Haynes, David R. Lide, Thomas J. Bruno (2016-2017, 97th ed.). Boca Raton, Florida. 2016. ISBN 978-1-4987-5428-6. OCLC 930681942.{{cite book}}: CS1 maint: location missing publisher (link) CS1 maint: others (link)

[3] "Lead iodate". pubchem.ncbi.nlm.nih.gov.

[4] The Journal of Industrial and Engineering Chemistry. American Chemical Society. 1914. p. 399.{{cite book}}: CS1 maint: date and year (link)

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