Calcium and Chromic Acid

Chromic Acid
Chromic acid is very soluble in water, chromium acid have unlimited solubility in water, the color of this chemicals is red brown in solid state or called as chromic acid flake. The solution color in water is red. Because chrome itself is metal after dilute in water this chrome can attract by negative pole of electric current. The solution of chromic acid flake called as chromic acid. As on solid state chromium acid have formula CrO3 and after dilute in water the formula become H2CrO4.

Chromic acid is an intermediate in chromium plating, and is also used in ceramic glazes, and colored glass. Because a solution of chromic acid in sulfuric acid (also known as a sulfochromic mixture) is a powerful oxidizing agent, it can be used to clean laboratory glassware, particularly of otherwise insoluble organic residues. This application has declined due to environmental concerns. Furthermore the acid leaves trace amounts of paramagnetic ions Cr(III) and Cr(V) that can interfere with certain applications, such as NMR spectroscopy. This is especially the case for NMR tubes.

Calcium
Calcium is important to our body. The chemical element calcium is a malleable, light, silver while metal, an Alkaline Earth Metal of Group IIA in the periodic table. Its symbol is Ca, its atomic number is 20, and its atomic weight is 40.08.

Calcium was first prepared by Sir Humphrey Davy in 1808. following the method of J.J. Berzellus and M.M. Pontin. Davy electrolyzed a mixture of lime, CaO, and mercury to produce an amalgam (a mercury, he obtained a calcite, a form of calcium carbonate (CaCO3).