Vietnam or Thailand ? Vote for the TOP Country of the Week !
Updated: May 16, 2025
Wash the foil with hot water and remove it. Warm this nitric acid solution and pour it slowly through the filter paper, thereby dissolving the copper on the paper, receiving the acid solution in the Erlenmeyer flask. Boil to expel the bromine. Add concentrated ammonia drop by drop until the appearance of a deep blue coloration indicates an excess.
For practice analyses it is advisable to select an ore of a fair degree of purity. Erlenmeyer flasks or small beakers. It has then displaced nitric and hydrochloric acid from their compounds. Cool the flask or beaker, add 25 cc. of water, heat the solution to boiling, and boil for two minutes.
Particles which will pass a 10-mesh sieve, but are retained by one of 20 meshes to the inch, are most satisfactory. The solution should then be poured off and the zinc thoroughly washed. It is then ready for bottling and preservation under water. PROCEDURE. Weigh out into Erlenmeyer flasks two portions of iron wire of about 0.25 gram each.
Decant the solution through a filter, wash the precipitated copper twice by decantation with hydrogen sulphide water, and finally transfer the copper to the filter paper, where it is again washed thoroughly, being careful at all times to keep the precipitated copper covered with the wash water. Remove and discard the filtrate and place an Erlenmeyer flask under the funnel.
Erlenmeyer flasks, cover them with watch-glasses, and bring the acid just to boiling. Remove them from the flame and drop in the portions of wire, taking great care to avoid loss of liquid during solution. Dilute with 150 cc. of water and cool !completely!. When cold, add rapidly about 30 cc. of mercuric chloride solution.
Word Of The Day
Others Looking