Silver plating from fulminating silver and glucose:
http://www.colorado.edu/chem/genchem/demoman/o_demo.html
1. Add 5mL 10% AgNO3 to a florence flask.
2. Add 1mL 10% NaOH. NOTE: The first two steps may be carried out immediately
before
lecture. (This makes silver oxide).
3. Add 15M NH3 (ammonia) until the brownish silver oxide has just dissolved.
(The solution may
still appear dark.)
4. Add 7mL of 1% glucose solution and swirl for a few minutes. A silver mirror
will coat the inside
of the flask.
EQUATIONS:
RCHO + 2Ag(NH3)2OH > 2Ag(s) + RCOONH4+ + NH3 + H2O
colloidal silver from silver oxide and glucose:
http://www.sas.org/E-Bulletin/2003-10-31/chem/body.html
Dissolve 2 g dextrin and 2 g sodium
hydroxide in100 mL distilled or deionized
water. Gradually add 1.4 g silver nitrate
dissolved in a small volume of water. Initially
a brown suspension of silver oxide will be
formed. This muddy brown liquid will slowly
change color to a reddish chocolate as the
dextrin slowly reduces the oxide to colloidal
silver. Eventually it assumes a deep red
color showing a fine bluish reflection,
particularly after it is bottled. This is due to a
thin film of metallic silver being deposited on
the wall of the bottle. A few mL of this silver
sol will color a large volume of water. When
not too dilute, its color will be a beautiful red, perfectly transparent by
transmitted light, but exhibiting a slight chocolate opacity by reflected
light.
Marshall
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