Potassium chromium

Potassium chromium sufphaie 10043-67-1 AlunMrm potassium srlphaite... 

Potassium chromate, manufacture, 6 542 Potassium chromate(VI), physical properties, 6 528t Potassium chromium(III) sulfate... 

One hundred grams of very finely powdered potassium chromium (III) sulfate (chrome alum) are mixed in a flask... 

In the chemical process industries, nickel, cobalt, platinum, palladium, and mixtures containing potassium, chromium, copper, aluminum, and other metals are used in very large-scale dehydrogenation processes. For example, acetone (6 billion pounds per year) is made from isopropyl alcohol styrene (over 2 billion pounds per year) is made from ethylbenzene. The dehydrogenation of n-paraffins yields detergent alkylates and n-olefins. The catalytic use of rhenium for selective dehydrogenation has increased in recent years. Dehydrogenation is one of the most commonly practiced of ihe chemical unit processes. 

Two solutions are prepared (a) 5 g. (0.01 mol) of potassium chromium alum is dissolved in 20 ml. of water and (b) 21 g. of sodium hydroxide (0.50 mol) and 10 g. of bigua-nide sulfate 2-hydratet is dissolved in 50 ml. of water. Solution b is heated to 75°, and solution a is added drop by drop with constant stirring. As each drop strikes the alkaline solution, there is a momentary formation of green chromium hydroxide which dissolves to form a dark red solution. As the reaction progresses, bright red, prismatic crystals separate from the solution. After all of solution a has been added, the mixture is cooled in ice water until no more solid separates. The crystals are filtered on a fritted-glass funnel and washed with 5 ml. of cold water. 

In the chemical process industries, nickel, cobalt, platinum, palladium, and mixtures containing potassium, chromium, copper, aluminum, and other metals are used in very large-scale dehydrogenation processes. 

Synonyms Chrome alum, Chromium and potassium sulfate, Potassium chromium sulfate. Appearance Dark violet-red crystals (ruby red by transmitted light) or light violet powder. Uses Preparation of chrome alum fixing bath as hardening agent for gelatin. 

Analysis of a compound containing potassium, chromium, and oxygen determines that in a 3.34 g sample, 0.89 g is potassium, 1.18 g is chromium, and 1.27 g is oxygen. What is the empirical formula of the compound ... 

You have two 500.0-mL aqueous solutions. Solution A is a solution of a metal nitrate that is 8.246% nitrogen by mass. The ionic compound in solution B consists of potassium, chromium, and oxygen, and the chromium has an oxidation state of +6. The masses of the solutes in each of the solutions are the same. When the solutions are added together, a blood-red precipitant forms. After the reaction has gone to completion, you dry the solid and find that it has a mass of 331.8 g. 

Ca0Si02). Small amounts of magnesia, sodium, potassium, chromium, and sulfur are also present in combined form. Containing less than 1% ciystalline silica (FEREAC 39,23540,74). IDLH 5000... 

SYNS CHROME ALUM CHROME POTASH ALUM CHROMIC POTASSIUM SULFATE CHROMIC POTASSIUM SULPHATE CHROMIUM POTASSIUM SULFATE (1 1 2) CHROMIUM POTASSIUM SULPHATE CRYSTAL CHROME ALUM POTASSIUM CHROMIC SULPHATE POTASSIUM CHROMIUM ALUM POTASSIUM DISULPHATOCHROMATE(III) SULFURIC ACID, CHROMIUM (3+) POTASSIUM SALT (2 1 1)... 

Chromium in its Compounds is sometimes metallic and sometimes non-metallic toward the other components. Thus, in chromium trioxide, CrOg, the anhydride of the hypothetical chromic acid, H2Cr04, chromium acts as a non-metal, just like sulphur in sulphuric acid hence in chromates the chromium is acidic, or non-metallic, in its chemical relations with the other elements. In chromic compounds, however, chromium acts as a metal. Thus chromium hydroxide, Cr(OH)3, is analogous to aluminium hydroxide chrome alum is potassium chromium sulphate, and is analogous to aluminium alum. The two classes pass into each other by appropriate operations,... 

Potassium Chromium Alum, Chrome Alum, KjSOj. Cr2(S04)3.24H20, first isolated by Mussin-Pusehin, is obtained by the reduction of a mixture of potassium dichromate and sulphuric acid by sulphurous acid, alcohol, oxalic acid, etc. ... 

KCrO , Potassium chromium oxide, 22 59 KCr2HOioCio, Chromate, p-hydrido-bis[pentacarbonyI-, potassium, 23 27 KFeU, Uranate(V), hexafluoro-, potassium, 21 166... 

K0SC0O2, Potassium cobalt oxide, 22 57 Ko 5Cr02, Potassium chromium oxide, 22 59 Ko.s7Co02, Potassium cobalt oxide, 22 57 Ko.6Cr02, Potassium chromium oxide, 22 59 Ko7Cr02, Potassium chromium oxide, 22 59 Ko.77Cr02, Potassium chromium oxide,... 

Potassium dichromate is used in the following applications as an anticorrosive agent, in the manufacture of other potassium/chromium compounds, in the manufacture of glass and glazes, and as a constituent in pyrotechnic compositions. 

Arrhenius parameters for the dehydrations of ammonium and potassium aliuninium alums [38] were in agreement with the Polanyi-Wigner equation. Comparisons of the shapes of nuclei on different crystal surfaces indicated that reaction proceeds along (100) planes. The observed decrease of the rate in water vapour is attributed to the blocking of pores by adsorbed molecules. No intranuclear cracking was apparent and the product-reactant boimdaries became irregular because of the influence of water on reorganization of the product phase. The appearance of these nuclei contrasted markedly with those in mixed potassium chromium/aluminium alums, where there is an approximately concentric structure. 

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