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Updated: June 23, 2025
The first contained about 10 per cent. of bichromate and 9 per cent. of H SO by weight; the second was eight-tenths as strong, the third about half as strong, the fourth about one and a half times as strong. In all cases the amount of solution employed was considerably in excess of the amount required to dissolve the steel used. A residue was obtained as before. C, 0.266 per 100 of steel.
The two substances most commonly used as standards for a bichromate solution are ferrous ammonium sulphate and iron wire. A standard wire is to be purchased in the market which answers the purpose well, and its iron content may be determined for each lot purchased by a number of gravimetric determinations.
The latter object is accomplished by oxidation to stannic chloride by means of mercuric chloride added in excess, as the mercuric salts have no effect upon ferrous iron or the bichromate. The reactions involved are: 2FeCl + SnCl > 2FeCl + SnCl SnCl + 2HgCl > SnCl + 2HgCl The mercurous chloride is precipitated.
Some of the manufacturers of new musical instruments on the continent lower the colour of the wood before varnishing by staining it with a solution of bichromate of potash. Sometimes when dexterously applied the colour is very good, but the stain is liable to make itself too evident in parts where the wood may be a little more spongy than at others.
!Answer!: 34.8 cc. !Answer!: 0.85 cc. How many cubic centimeters of a solution of potassium bichromate containing 26.30 grams of K Cr O per liter must be taken in order to yield 0.6033 gram of Cr O after reduction and precipitation of the chromium? !Answer!: 44.39 cc. !Answer!: 4.74 cc. !Answer!: 6.99 grams.
"With the Ruhmkorff apparatus, M. Aronnax; one is carried on the back, the other is fastened to the waist. It is composed of a Bunsen pile, which I do not work with bichromate of potash, but with sodium. A wire is introduced which collects the electricity produced, and directs it towards a particularly made lantern. In this lantern is a spiral glass which contains a small quantity of carbonic gas.
This bath has for its object to remove the coating of bichromate, so as to allow the color to adhere to the glass, from which it has been separated by the layer of glucose and bichromate, which would prevent the vitrification. The bath has also for its object to render the light parts of the picture perfectly pure and capable of being easily retouched or painted by hand.
Proceed with the solution of the ore, and the treatment of the residue, if necessary, exactly as described for the bichromate process on page 56. Ferric sulphate separates at this point, since there is no water to hold it in solution and care is required to prevent bumping. !Zimmermann-Reinhardt Procedure! PROCEDURE. Grind the mineral to a fine powder.
In this case no standardization is made, as the normal value can be calculated directly. It is, however, more generally customary to standardize a solution of the commercial salt by comparison with some substance of definite composition, as described below. PROCEDURE. Pulverize about 5 grams of potassium bichromate of good quality.
The sensitizing solution which serves to produce the verifiable image is prepared as follows: Bichromate of ammonia is dissolved in water till the latter is saturated; five grammes of powdered dextrin or glucose are then dissolved in 100 grammes of water; to either of these solutions is added 10 per cent. of the solution of bichromate, and the mixture filtered.
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