from The Century Dictionary.
- noun A salt of thiosulphuric acid.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Chem.) A salt of thiosulphuric acid; -- formerly called
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A
saltof thiosulphuric acid.
from Wiktionary, Creative Commons Attribution/Share-Alike License
Bottle containing oil requires 40.0 c.c. thiosulphate.
After the expiration of four hours 20 c.c. of 10 per cent. solution of potassium iodide and 150 c.c. water are added to the contents of the bottle, and the excess of iodine titrated with N/10 sodium thiosulphate solution, the whole being well agitated during the titration, which is finished with starch paste as indicator.
The starch indicator is then added, and the excess of thiosulphate re-titrated.
In our practice we have often taken a negative cliché from drawings made in the ordinary manner, without the aid of the camera obscura (which would have been too expensive for drawings of a certain size), by simply printing a proof by contact on plain or albumenized silvered paper, and fixing, without toning, in a new solution of sodium thiosulphate, then washing as usual.
When the photograph is a silver print especially made for the purpose in question and, consequently not _toned, _ but simply fixed in a new thiosulphate (hyposulphite) bath, and well washed — it is bleached by flowing over a solution of —
One drop of methyl orange is then added, and the solution titrated with N/20 sulphuric acid, which has been standardised against weighings of 0. 05-0.1 grm. fulminate to which 25 c.c. of water is added in a porcelain dish, then 0.5 grm. of thiosulphate, and after stirring for two and a half minutes, titrated with N/20 sulphuric acid.
Mauricheau-Beaupré has elaborated a volumetric method for the estimation of the phosphine in crude acetylene depending on its decomposition by a known volume of excess of centinormal solution of iodine, addition of excess of standard solution of sodium thiosulphate, and titrating back with decinormal solution of iodine with a few drops of starch solution as an indicator.
_ -- Empty the stomach by the tube at once, and wash it out with a solution of sodium thiosulphate.
The mixture is then acidified with the hydrochloric acid solution, and while agitated, an excess of sodium thiosulphate solution is added, the mixture being afterwards allowed to stand a few minutes.
If the photograph has been toned, i.e., colored by a deposit of gold, or if it was fixed in a thiosulphate bath in which toned prints have been fixed, then the image is dissolved by treatment in a solution of potassium cyanide in alcoholized water.