Titanyl sulfate

Structural formula
No drawing available
General
Surname	Titanyl sulfate
other names	Titanium oxide sulfate Titanium oxysulfate Titanium (IV) oxide sulfate
Molecular formula	TiO (SO 4 )
Brief description	white odorless solid
External identifiers / databases
CAS number 13825-74-6 34354-86-4 16425-76-6 (monohydrate) 64514-49-4 (dihydrate) EC number 237-523-0 ECHA InfoCard 100,034,098 PubChem 10866624 Wikidata Q1319162
properties
Molar mass	159.93 g mol −1
Physical state	firmly
density	2.05 g cm −3 2.71 g cm −3 (monohydrate)
Melting point	500 ° C (decomposition)
solubility	practically insoluble in water soluble in water (dihydrate)
Refractive index	1.8
safety instructions
GHS labeling of hazardous substances danger H and P phrases H: 290-314 P: 260-280-303 + 361 + 353-304 + 340 + 310-305 + 351 + 338
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . Refractive index: Na-D line , 20 ° C

Titanyl sulfate is a chemical compound of titanium from the group of sulfates .

Extraction and presentation

Titanyl sulfate monohydrate can be obtained by reacting titanium (IV) oxide with concentrated sulfuric acid.

${\displaystyle \mathrm {TiO_{2}+2\ H_{2}SO_{4}\longrightarrow Ti(SO_{4})_{2}+2\ H_{2}O} }$

${\displaystyle \mathrm {Ti(SO_{4})_{2}+2\ H_{2}O\longrightarrow TiOSO_{4}\cdot H_{2}O+H_{2}SO_{4}} }$

The monohydrate is obtained from the action of sulfuric acid salts of titanium (IV) compounds such as titanium (IV) sulfate Ti (SO ₄ ) ₂ with water.

The anhydrous form is obtained from the reaction of titanium (IV) chloride with concentrated sulfuric acid, the resulting still strongly HCl -containing solution having to be freed from HCl in vacuo and dried, since yellowish gelatinous or Resin-like masses precipitate.

${\displaystyle \mathrm {TiCl_{4}+H_{2}SO_{4}+H_{2}O\longrightarrow TiOSO_{4}+4\ HCl} }$

When titanium (IV) oxide or its hydrates react with concentrated sulfuric acid, titanyl sulfate is also formed. When using 70% sulfuric acid, the easily water-soluble dihydrate is formed.

properties

Titanyl sulfate is a moisture-sensitive white odorless solid that is soluble in water. In the titanyl sulphate there are endless Ti-O-Ti-O-zigzag chains in which the structure is completed by the sulphate and (with the hydrate) by water molecules. Titanyl sulfate has an orthorhombic crystal structure with the space group P 2 ₁ 2 ₁ 2 ₁ (space group no. 19) . The monohydrate also has an orthorhombic crystal structure, but with the space group Pmn 2 ₁ (no. 31) and converts into the anhydrous form at 350 ° C. This decomposes at 500 ° C.

use

Titanyl sulphate is used as a detection reagent for hydrogen peroxide and titanium, since the intense orange-yellow colored peroxotitanyl ion (TiO ₂ ) ²⁺ is formed when it is present . This proof is very sensitive and traces of hydrogen peroxide can already be detected. It is also produced as an intermediate product in the sulphate process for the production of titanium dioxide .

Individual evidence

1. ↑ ^{a b c d e f} record with titanyl sulfate in the GESTIS database of IFA , accessed on January 10, 2017(JavaScript required) .
2. ↑ ^{a b c d} Jean D'Ans, Ellen Lax: Pocket book for chemists and physicists . Springer, 1997, ISBN 3-540-60035-3 , pp. 770 ( limited preview in Google Book search).
3. ↑ ^{a b c} Georg Brauer (ed.), With the collaboration of Marianne Baudler a . a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume II, Ferdinand Enke, Stuttgart 1978, ISBN 3-432-87813-3 , p. 1375.
4. ^ ^{A b} Hans Peter Latscha, Martin Mutz: Chemistry of the elements: Chemistry . Springer, 2011, ISBN 3-642-16914-7 , pp. 215 ( limited preview in Google Book search).
5. ^ Egon Wiberg, AF Holleman, Nils Wiberg: Inorganic Chemistry . Academic Press, 2001, ISBN 0-12-352651-5 , pp. 1331 ( limited preview in Google Book search).
6. ^ Uni-regensburg: hydrogen peroxide