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Zinc Oxide (Pharmacy): Zinc Carbonate Precipitated with Hot Soda, Then Heated
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Charlie

21. uMfumfu 2026DE
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Zinc Oxide (Pharmacy): Zinc Carbonate Precipitated with Hot Soda, Then Heated

The zinc oxide of pharmacy, by the wet route Thorpe's Dictionary (1913) gives: very pure zinc sulphate is precipitated with a hot solution of sodium carbonate, and the dried zinc carbonate is heated to drive off the carbon dioxide. Pure zinc oxide dissolves completely in ammonia. The picture: our diagram.
Oqalayo
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Imiyalelo

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Precipitate with hot sodium carbonate

Precipitate a solution of very pure zinc sulphate with a hot solution of sodium carbonate. No amounts are given. Ours: dissolve each in water and stir the hot carbonate solution in.

Izinto zokwakha zalesi sinyathelo:

I-zinc sulfateI-zinc sulfate1 as required

Amathuluzi adingekayo:

I-Sodium Carbonate (umlotha we-soda)I-Sodium Carbonate (umlotha we-soda)
Amanzi AcwengisisiweAmanzi Acwengisisiwe
Ibhikha LengilaziIbhikha Lengilazi
IsigovuziIsigovuzi
Ipuleti ElishisayoIpuleti Elishisayo
Amagilavu erabhaAmagilavu erabha
2

Filter, wash and dry (ours)

Ours: filter off the carbonate, wash it with water and dry it.

Amathuluzi adingekayo:

Iphepha LokuhluzaIphepha Lokuhluza
Ifanela Lengilazi ElinomlomoIfanela Lengilazi Elinomlomo
Ibhodlela LokuhlambululaIbhodlela Lokuhlambulula
Ihhavini yokomisaIhhavini yokomisa
3

Heat to expel carbon dioxide

Heat the dried carbonate to drive off the carbon dioxide, leaving zinc oxide. No temperature is given. Ours: a crucible in a muffle furnace.

Amathuluzi adingekayo:

I-crucible enesivalo (i-porcelain)I-crucible enesivalo (i-porcelain)
Isithando se-muffleIsithando se-muffle
Udlawu Lwesitsha SokuncibilikisaUdlawu Lwesitsha Sokuncibilikisa
Amagilavu Amelana NokushisaAmagilavu Amelana Nokushisa

Izinto

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Amathuluzi Adingekayo

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