Synthesis of chrome alum

Preparation of chrome alum (chromium(III) potassium sulfate)

The chrome alum is obtained by crystallizing a mixture of potassium and chromium sulfates.

Preparation of chrome alum (chromium(III) potassium sulfate)

Preparation of chrome alum (chromium(III) potassium sulfate)

Potassium and chromium sulfates are directly obtained by reducing potassium dichromate with ethanol in acid medium.

Preparation of potassium sulfate and chromium sulfate by reducing potassium dichromate with ethanol

Preparation of potassium sulfate and chromium sulfate by reducing potassium dichromate with ethanol

98 grams of potassium dichromate are placed in a porcelain dish containing 400 ml of water. 76 ml of concentrated sulfuric acid are slowly added and stirred until all the salt is dissolved. If potassium dichromate has not completely dissolved the mixture is warmed gently. After all the salt has dissolved, the solution is filtered if it is not absolutely clear. Then 63 ml of ethyl alcohol are cautiously added, by stirring the reaction mixture after each addition and by allowing the heat of the reaction to raise the temperature of the solution to the boiling point. When all ethanol has been added the flask is covered and the hot solution is left to stand for  a week or longer. The obtained crystals of chrome alum are filtered and if the filtrate is evaporated the additional amount of chrome alum is obtained. The crystals are dried and stored in a bottle since they are efflorescent. Chrome alum obtained by described method contains twelve molecules of crystalized water (dodecahydrate) – KCr(SO4)2 · 12H2O.

Synthetic inorganic chemistry, by A. A. Blanchard, 328-330, 1936

IUPAC Name

potassium;chromium(3+);disulfate

InChI

InChI=1S/Cr.K.2H2O4S/c;;2*1-5(2,3)4/h;;2*(H2,1,2,3,4)/q+3;+1;;/p-4

InChI Key

OIDPCXKPHYRNKH-UHFFFAOYSA-J

Canonical SMILES

[O-]S(=O)(=O)[O-].[O-]S(=O)(=O)[O-].[K+].[Cr+3]

MeSH Synonyms

chromalum, chrome alum, chrome alum, dodecahydrate, chromic potassium sulfate, chromic potassium sulfate dodecahydrate

Depositor-Supplied Synonyms

Chromium potassium sulfate, Chrome potash alum, Crystal Chrome Alum, Potassium chromium alum, Potassium chromic sulfate, 0% Basicity chrome alum, Chromic potassium sulphate, Potassium chromic sulphate, Potassium chromium sulfate, Chromium potassium sulphate, CCRIS 6183, CCRIS 7532, CHROMIC POTASSIUM SULFATE, Chromium(III) potassium sulfate, Potassium chromium(III) sulfate, Chromium potassium bis(sulphate), Potassium disulphatochromate (III), EINECS 233-401-6, EINECS 233-627-5, Chromium potassium sulfate (1:1:2), Sulfuric acid, chromium potassium salt, Sulphuric acid, chromium potassium salt, Potassium chromic sulfate [Chromium and chromium compounds], Chromium(III) potassium sulfate solution, Chromium potassium sulfate (CrK(SO4)2), Potassium chromium disulfate (KCr(SO4)2), 10141-00-1, Sulfuric acid, chromium(3+) potassium salt (2:1:1), ACMC-20algb, AC1L1VC5, UNII-579U79PAIC, 34636_RIEDEL, 579U79PAIC, 34636_FLUKA, 7788-99-0 (dodecahydrate), CTK3J9759, potassium chromium(3+) disulfate, AKOS015913956, LS-53443, LS-188419, TC-167474, Sulfuric acid, chromium potassium salt (1:?:?), I14-44896, Sulfuric acid,chromium(3+) potassium salt (2:1:1), 10279-63-7, 14766-82-6, 81827-72-7, 81827-73-8

Removed Synonyms

Chrome alum, CID61489, 15244-38-9

IUPAC Name

potassium;chromium(3+);disulfate;dodecahydrate

InChI

InChI=1S/Cr.K.2H2O4S.12H2O/c;;2*1-5(2,3)4;;;;;;;;;;;;/h;;2*(H2,1,2,3,4);12*1H2/q+3;+1;;;;;;;;;;;;;;/p-4

InChI Key

ZFVHBEKVAITXHW-UHFFFAOYSA-J

Canonical SMILES

O.O.O.O.O.O.O.O.O.O.O.O.[O-]S(=O)(=O)[O-].[O-]S(=O)(=O)[O-].[K+].[Cr+3]

MeSH Synonyms

chromalum, chrome alum, chrome alum, dodecahydrate, chromic potassium sulfate, chromic potassium sulfate dodecahydrate

Depositor-Supplied Synonyms

Chrome alum, Chromium potassium sulfate dodecahydrate, 7788-99-0, Chrome alum (dodecahydrate), UNII-H54D055WX6, CCRIS 8929, Potassium chromium alum dodecahydrate, Chromium(III) potassium sulfate dodecahydrate, Potassium chromium(III) sulfate dodecahydrate, Chromium(III) potassium sulfate (1:1:2), dodecahydrate, Sulfuric acid, chromium(3+)potassium salt(2:1:1), dodecahydrate, ACMC-20alga, AC1L2NJM, KSC492E4P, 60151_FLUKA, 60152_FLUKA, CTK3J2247, MolPort-019-905-476, 60151_SIAL, 60152_SIAL, H54D055WX6, 10141-00-1 (Parent), 243361_SIAL, AKOS015902664, Chromic potassium sulfate dodecahydrate, RTR-024931, TRA0072036, LS-53444, T987, TR-024931, potassium chromium(3+) disulfate dodecahydrate, chromium(3+) ion potassium dodecahydrate disulfate, 3B4-4680, chromium(3+) potassium sulfate hydrate (1:1:2:12), I14-19756

Removed Synonyms

CID24596, 10141-00-1

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