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Chromic-acid cleaning mixture

The most widely used cleansing agent is the chromic acid cleaning mixture. It is essentially a mixture of chromic acid (CrOj) and concentrated sulphuric acid, and possesses powerful oxidising and solvent properties. Two methods of preparation are available —... [Pg.53]

A method which is frequently used consists in filling the apparatus with chromic acid cleaning mixture (CARE), a nearly saturated solution of powdered sodium dichromate or potassium dichromate in concentrated sulphuric acid, and allowing it to stand for several hours, preferably overnight the acid is then poured off, the apparatus thoroughly rinsed with distilled water, and allowed to drain until dry. [It may be mentioned that potassium dichromate is not very soluble in concentrated sulphuric acid (about 5 g per litre), whereas... [Pg.79]

Chromic acid cleaning mixture, 53 Chromophores, 1144-1146 three conjugated, 1146 two conjugated, 1146 typical single, 1145 Chrysoidine, 620, 623 Cinnamic acid, 707, 712, 1113... [Pg.1171]

Sulphuric acid (concentrated and oleum ) - should always be mixed with water very carefully, by pouring into cold water as a thin stream to prevent acid splashes or spray. Chromic acid cleaning mixtures have the corrosive properties of concentrated sulphuric acid as well as the dangerous oxidising properties of the chromic acid. [Pg.43]

Chromic Acid Cleaning Mixture Dissolve 200 g of sodium dichromate in about 100 mL of water to which 1500 mL of sulfuric acid has been added, slowly with stirring. [Pg.291]

Chromic acid cleaning mixture. Dissolve 10 g of sodimn dichromate in 10 ml of water in a 400 ml beaker. Add slowly with careful stirring 200 ml of concentrated sulfuric acid. The temperature will rise to nearly 80°. Allow the mixture to cool to about 40° and place... [Pg.358]

When any evidence of greasiness appears, e.g. if there is difficulty in the separation of the water and the entraining liquid, the condenser and receiver should be cleaned with chromic acid cleaning mixture, thoroughly rinsed with water and dried in an oven. [Pg.803]

It is probably present in chromic acid cleaning mixtures along with the mixed chromic-sulfuric acid H2CrS07... [Pg.32]

See other pages where Chromic-acid cleaning mixture is mentioned: [Pg.204]    [Pg.5]    [Pg.14]    [Pg.11]    [Pg.30]    [Pg.12]    [Pg.30]    [Pg.204]    [Pg.28]    [Pg.200]    [Pg.235]    [Pg.28]    [Pg.200]    [Pg.235]    [Pg.291]    [Pg.3]    [Pg.12]    [Pg.6]    [Pg.14]    [Pg.276]    [Pg.204]    [Pg.5]    [Pg.5]    [Pg.15]    [Pg.6]    [Pg.15]   
See also in sourсe #XX -- [ Pg.4 , Pg.12 ]

See also in sourсe #XX -- [ Pg.4 , Pg.12 ]



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