Rinsing gold powder in sodium hydroxide, Hoke

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Hartbar

Well-known member
Supporting Member
Joined
May 6, 2021
Messages
116
In Hokes book she mentions boiling the powder from gold filled in sodium hydroxide, after the water and HCL.
I’ve not seen that mentioned on here. Water, HCL, water, ammonia, water seems to be the popular sequence.
Anybody do this?
 
A good rule of thumb for chemical disintegration is acids for metals and alkalis for organic material.
Hydroxide reacts well both with metals (zinc, aluminum, titanium) and non-metals: halogens, sulfur and phosphorus.
In the interaction of sodium hydroxide with aluminum, sodium tetrahydroxoaluminate and hydrogen form.
This reaction was used to produce hydrogen to fill air-ships and air balloons, so do outdoors ventilating well to avoid explosions.
 
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