Calcium tungstate
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Calcium tungstate
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CAS No:
7790-75-2
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Formula:
Ca.O4W
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Chemical Name:
Calcium tungstate
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Synonyms:
Calcium tungsten oxide (CaWO4);Tungstic acid (H2WO4),calcium salt (1:1);C.I. 77250;Calcium tungstate;Tungsten Yellow;Calcium tungsten tetraoxide;Calcium tungstate (CaWO4);Tungstate (WO42-),calcium (1:1),(T-4)-;Lightning-Plus;Hi-Plus;VP 2;EU-V 1A;EU-V 2;Cronex Par Speed;Du Pont Hi-Plus;Detail;VP 2 (tungstate);113933-94-1;210909-23-2;699019-75-5;1362691-61-9;1412435-72-3;1786413-14-6;2095253-92-0;2266561-57-1
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CAS No:
Description
-325 mesh, 10μm or less 99.9% pure; occurs in nature as mineral scheelite; white tetr powder(s), a=0.524 nm, c=1.138 nm; can be prepared by heating tungstic acid and CaO or CaCO3; used in tumor treatment and in luminous paint [KIR83] [STR93] [MER06]
Characteristics
80.26000
-0.47520
powder
5.80 g/cm3 @ Temp: Room temp
1620°C
Insoluble in H{2}O. Decomposes by hot HCl, HNO{3}
-20°C
Safety Information
NONH for all modes of transport
3
Stable under normal shipping and handling conditions.
Calcium tungstate Use and Manufacturing
Calcium tungstate is produced by reacting calcium oxide or calcium hydroxide with tungsten oxide or tungsten hydroxide in an alkali metal hydroxide or carbonate solution. Sodium tungstate and sodium sulfide are mixed and dissolved in water, and then zinc chloride aqueous solution is added, filtered, and the filtrate is treated with pure calcium chloride to prepare calcium tungstate.
Very small crystals have been used for injection into malignant tumors, etc., thus affording by transillumination a means of x-ray treatment; for preparing screens for x-ray observations and photographs; in luminous paints; in scintillation counters.
Calcium tungsten oxide (CaWO4): ACTIVE
Computed Properties
Molecular Weight:287.92
Hydrogen Bond Acceptor Count:4
Exact Mass:287.893183
Monoisotopic Mass:287.893183
Topological Polar Surface Area:80.3
Heavy Atom Count:6
Complexity:85.2
Covalently-Bonded Unit Count:2
Compound Is Canonicalized:Yes
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