Preparation of Chromium Properties of Chromium
Platinum — Platinum is a chemical element with symbol Pt and atomic number It is a dense, malleable, ductile, highly unreactive, precious and its name is derived from the Spanish term platina, translated into little silver. Platinum is a member of the group of elements and group 10 of the periodic table of elements.
It occurs in some nickel and copper ores along with some deposits, mostly in South Africa. Because of its scarcity in Earths crust, only a few hundred tonnes are produced annually, Platinum is one of the least reactive metals.
It has remarkable resistance to corrosion, even at high temperatures, consequently, platinum is often found chemically uncombined as native platinum. Because it occurs naturally in the sands of various rivers.
Platinum is used in catalytic converters, laboratory equipment, electrical contacts and electrodes, platinum resistance thermometers, dentistry equipment, and jewelry.
Being a heavy metal, it leads to health issues upon exposure to its salts, compounds containing platinum, such as cisplatin, oxaliplatin and carboplatin, are applied in chemotherapy against certain types of cancer.
Pure platinum is a lustrous, ductile, and malleable, silver-white metal, Platinum is more ductile than gold, silver or copper, thus being the most ductile of pure metals, but it is less malleable than gold.
The metal has excellent resistance to corrosion, is stable at temperatures and has stable electrical properties. Platinum reacts with oxygen slowly at high temperatures.
Platinum is insoluble in hydrochloric and nitric acid, but dissolves in hot aqua regia to form chloroplatinic acid and its physical characteristics and chemical stability make it useful for industrial applications.
As is expected, tetracoordinate platinum compounds tend to adopt electron square planar geometries, Platinum has six naturally occurring isotopes, Pt, Pt, Pt, Pt, Pt, and Pt 2.
This colorless deliquescent salt has a range of uses. Sodium acetate is used in the industry to neutralize sulfuric acid waste streams. It is also an agent in chrome tanning and helps to impede vulcanization of chloroprene in synthetic rubber production.
In processing cotton for disposable cotton pads, sodium acetate is used to eliminate the buildup of static electricity. Sodium acetate may be added to food as a seasoning, sometimes in the form of sodium diacetate and it is often used to give potato chips a salt and vinegar flavor.
As the conjugate base of acetic acid, a solution of sodium acetate and this is useful especially in biochemical applications where reactions are pH-dependent in a mildly acidic range. Sodium acetate is used in heating pads, hand warmers.
Sodium acetate trihydrate crystals melt at This solution is capable of cooling to room temperature without forming crystals, by pressing on a metal disc within the heating pad, a nucleation center is formed, causing the solution to crystallize back into solid sodium acetate trihydrate.
Any of these reactions produce sodium acetate and water, carbonic acid readily decomposes under normal conditions into gaseous carbon dioxide and water. This is the taking place in the well-known volcano that occurs when the household products, baking soda.
Coordination complex — Many metal-containing compounds, especially those of transition metals, are coordination complexes. A coordination complex whose centre is an atom is called a metal complex. Coordination complexes are so pervasive that their structures and reactions are described in many ways, the atom within a ligand that is bonded to the central metal atom or ion is called the donor atom.
In a typical complex, an ion is bonded to several donor atoms. A polydentate ligand is a molecule or ion that bonds to the atom through several of the ligands atoms.EXPERIMENT 5: SYNTHESIS OF Ni(en) 3 Cl 2 65 water to dissolve the solid because the product of the reaction is soluble in water.
Note the color of the solution in your lab notebook. Experiment 1. The preparation of some chromium(III) complexes 1 a) Preparation of tris-(1,2-diaminoethane)chromium(III) chloride, [Cr(en) 3]Cl 3 1 g granular zinc, g CrCl H 2 O, 10 cm 3 of 1,2-diaminoethane (ethylenediamine), and 10 cm 3 of methanol are refluxed on .
Aug 02, · Basic iron acetate forms on treating aqueous solutions of iron(III) sources with acetate salts.  Solid iron may be mixed with hydrogen peroxide to form iron(II and/or III) hydroxide, which can then react with vinegar/acetic acid or acetate salts to form iron(III) acetate.
Dec 02, · This series of preparations involves the synthesis of 3 different ethylenediamine complexes of chromium (III). Anhydrous chromium (III) sulfate is produced by drying hydrated chromium (III) sulfate which is a hydrate of variable constitution.
In this experiment the red, diamagnetic chromium(II) acetate hydrate solid will be prepared. The starting material for the synthesis is potassium dichromate K 2 Cr 2 O 7 which is reduced by zinc. Lab Report 4: Air sensitive Compounds: copper(I) chloride and chromium(II) acetate hydrate The laboratory report should be in ACS style and include a title page, an abstract.