Post numer:#1
przez rafal328 » 15 kwi 2014, o 04:18
Siema, slyszal ktos o czyms takim? Koszt jest naprawde smieszny jesli robic to samemu, wytrzymalosc slaba, ale raczej chodzi mi o pokrycie elementow nie narazonych na uszkodzenia mechaniczne np odblysniki reflektorow. Poza tym naklada sie na to klar, wiec moze da rade zwiekszyc tym samym wytrzymalosc. Tutaj proporcje
CH2OH(CHOH)4CHO + 2 [Ag(NH3)2]+ + 3 OH- ? 2 Ag + CH2OH(CHOH)4COO- + 4 NH3 + 2 H2O
Materials Preparation:
30 mL 0.10 M silver nitrate (azotan srebra), AgNO3 (To prepare 100 mL of solution, dissolve 1.7 g of AgNO3 in 60 mL of distilled water and dilute the resulting solution to 100 mL.)
ca. 3 mL concentrated (15 M) aqueous ammonia (amoniak) solution, NH3 (from a dropping bottle.)
15 mL 0.80 M sodium hydroxide (wodorotlenek sodu), NaOH (To prepare 100 mL of solution, dissolve 3.2 g of NaOH in 60 mL of distilled water and dilute the resulting solution to 100 mL.
ca. 3 mL concentrated (16 M) nitric acid (kwas azotowy), HNO3 (from a dropping bottle.)
10 mL 0.5 M dextrose (glukoza), C6H12O6 (To prepare 100 mL of solution, dissolve 9 g of dextrose in 60 mL of distilled water, and dilute the resulting solution to 100 mL.
Hot water to fill Florence flask.
100 mL beaker (zlewka o poj 100ml)
Stirring rod (mieszadło)
500 or 1000 mL Florence flask. (kolba)
This mixture should be prepared no more than one hour before use due to potential hazards. Pour 30 mL of 0.10 M AgNO3 into the 100 mL beaker. While stirring the solution, add drops of 15 M NH3 until the brown precipitate which forms initially has just dissolved. Add 15 mL of 0.80 M NaOH to this mixture. If a precipitate forms again, add drops of 15 M NH3 until it dissolves.
Pour 3 mL 0f 16 M HNO3 into the Florence flask and stopper it. Swirl the acid around to dampen the entire interior surface of the flask. Pour the acid from the flask, and flush it down the drain with water. Rinse the flask and stopper it.
Within ten minutes of presenting the demonstration, fill the flask with hot water to warm it.
Presentation:
Empty the water from the flask. Pour 10 mL of 0.5 M dextrose into the flask. Add the contents of the beaker, and stopper the flask. Swirl the flask continuously to cover its entire surface with a thin coating of the liquid. Within about a minute, the flask will begin to darken as a film of metallic silver forms on its inside surface. Continue to swirl the flask until the entire interior of the flask is covered with a film of silver, and the flask looks like a mirror. Pour the liquid from the flask, and flush it down the drain with water.
Ostatnio edytowano 15 kwi 2014, o 11:25 przez rafal328, łącznie edytowano 1 raz