LIST
FEGURÐ OG VELLÍÐAN
HANDVERK
MENNING OG SAGA
SKEMMTUN
UMHVERFI
MATUR OG DRYKKUR
ÖFUGVERKFRÆÐI
VÍSINDI
ÍÞRÓTTIR
TÆKNI
KLÆÐANLEG TÆKNI
Precipitated Silver: Silver Chloride Reduced by Zinc in Acidulated Water (Thorpe 1913)
Fine silver powder without melting anything. Hydrochloric acid throws silver out of solution as white silver chloride. Zinc in slightly acid water then takes the chlorine away and leaves the silver as a grey powder.
Source: Thorpe, Dictionary of Applied Chemistry, vol. 4 (1913), Silver. Thorpe gives no amounts, times or end-point. Ours: a silver nitrate solution, zinc sheet strips, hydrochloric acid of the two acids he names, and the washing and drying. Picture drawn by Youblob.
Byrjandi
1 day
Leiðbeiningar
1
1
Dissolve silver nitrate in water
Dissolve silver nitrate in water
Ours: dissolve silver nitrate in distilled water as the silver solution. Silver nitrate stains and burns skin: gloves and goggles.
Efni fyrir þetta skref:
Silfurnítrat1 as required
Eimað vatn1 as requiredNauðsynleg verkfæri:
Bikarglas úr bórsílíkati
Bórsílíkatglerstöng
Nítrílhanskar
Hlífðargleraugu gegn efnaslettum2
2
Throw down silver chloride with hydrochloric acid
Throw down silver chloride with hydrochloric acid
Add hydrochloric acid to the solution. White silver chloride falls. Ours: add it while it still makes a precipitate, let it settle and pour off the liquid.
Efni fyrir þetta skref:
Saltsýra1 as requiredNauðsynleg verkfæri:
Bikarglas úr bórsílíkatiBórsílíkatglerstöngNítrílhanskarHlífðargleraugu gegn efnaslettum3
3
Reduce the chloride with zinc in acid water
Reduce the chloride with zinc in acid water
Cover the chloride with water made slightly acid with hydrochloric acid (Thorpe: hydrochloric or sulphuric) and put zinc in it. The zinc reduces the chloride to silver. Ours: strips of zinc sheet, left in until no white chloride is left. Time not given.
Efni fyrir þetta skref:
Sinkþynna1 as requiredSaltsýra1 as requiredEimað vatn1 as requiredNauðsynleg verkfæri:
Bikarglas úr bórsílíkatiBórsílíkatglerstöngNítrílhanskarHlífðargleraugu gegn efnaslettum4
4
Take out the zinc, wash and dry the silver
Take out the zinc, wash and dry the silver
Ours: lift out what is left of the zinc, wash the grey silver powder with water until the washings are no longer acid, filter, and dry it. Keep it in a closed jar.
Nauðsynleg verkfæri:
Eimað vatn
Síupappír
Þurrkofn
GlerkrukkaEfni
4- 1 as requiredStaðgengill
- 2 as requiredStaðgengill
- 2 as requiredStaðgengill
- 1 as requiredStaðgengill
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