Synthesis of chromium(ii)acetate hydrate
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This document describes the properties and preparation of chromium(II) acetate hydrate. Chromium(II) acetate hydrate has the molecular formula C8H16Cr2O10 and appears as a brick-red solid. The document outlines the procedure to prepare chromium(II) acetate hydrate by reducing chromium(III) chloride with zinc in the presence of acetic acid and sodium acetate to form a red precipitate of the hydrate. Characterization details are provided, noting it will oxidize in air and is diamagnetic in its pure form.
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Number of IRs = Number of classes.- In C3v
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Thus we have
Which satisfy the rule sum of the square of the characters of all operations in any IRR is equal to the order of the group
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All the characters of this IRRs equal to +1 or -1
Also IRR must be Orthogonal to Г1
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The characters of Г2 is Orthogonal to Г1 so it has three +1 and three -1
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Synthesis of chromium(ii)acetate hydrate
- 1. Created By : Medina Indriati (J2C 007 030) Melly Wahyuningsih (J2C 007 031) Milka Ironia Realita (J2C 007 032)
- 2. What is Chromium(II)acetate Hydrate??? Chromium(II) acetate, better known as chromous acetate, is the coordination compound with the formula Cr2(CH3CO2)4(H2O)2 or Cr2(OAc)4(H2O)2
- 3. Properties Molecular formula C8H16Cr2O10 Molar mass 376.2 g/mol Appearance brick-red solid Density 1.79 g/cm3 Melting point dehydrates >100C Solubility in water soluble in hot water, MeOH
- 5. Preparation of Cr2(CH3CO2)4(H2O)2 Reagent required : - 15 g CrCl3.6H2O - 12 g of mossy zink - 90 g of NaOAc.3H2O - 25 ml of concentrated HCl - 200 ml of ice-cold boiled water - 75 ml of alcohol (95%) - 75 ml of ether
- 6. Procedure Place the mossy zink and solution of the CrCl3.6H2O in 50 ml of water in the flask. Slowly add concentrated HCl until the solution has a blue color. Make a slurry of the NaOAc.3H2O in 80 ml of water. While hydrogen gas is still being evolved, pinch the rubber tubing to force the chromium(II) chloride solution over into the sodium acetate solution that is in the Erlenmeyer flask.
- 7. Dip the delivery tube under the sodium acetate solution during the transfer, a red precipitate of chromous acetate forms. (note : do not at the chromium solution to the acetate unless the solution is a pure blue) Filter the chromous acetate on a sintered-glass funnel and wash it with cold air-free water. Do not stir up the precipitate with the wash water very much or the filtration may proceed slowly.
- 8. Wash with the alcohol and then the ether, and finally suck the crysstals as dry as possible on the funnel.
- 9. Characterization If air is admitted to the sample, it will gradually turn to the gray-green color characteristic of the oxidized material. Pure[Cr(OAc)2]2.2H2O is diamagnetic
- 10. Analysis [Cr(OAc)2]2·2H20 can be analyzed by Spectroscopy Infared (IR)
- 11. Reaction 2 Cr3+ + Zn → 2 Cr2+ + Zn2+ 2 Cr2+ + 4 OAc- + 2 H2O → Cr2(OAc)4(H2O)2 4 HO2CR + 2 Cr(C5H5)2 → Cr2(O2CR)4 + 4 C5H6 The overall net reaction is the sum of the above reaction : 2CrCl3·6H2O + Zn + 4 NaOAc·3H2O →[Cr(OAc)2]2·2H20 + ZnCl2 + 4 NaCl + 22 H20
- 12. THANK YOU…