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

Created by

Charlie

21. October 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.
Beginner
1 day

Instructions

1

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.

Materials for this step:

Zinc SulfateZinc Sulfate1 as required

Tools needed:

Sodium Carbonate (soda ash)Sodium Carbonate (soda ash)
Distilled WaterDistilled Water
Glass BeakerGlass Beaker
StirrerStirrer
Hot PlateHot Plate
Rubber GlovesRubber Gloves
2

Filter, wash and dry (ours)

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

Tools needed:

Filter PaperFilter Paper
Glass Funnel - StemmedGlass Funnel - Stemmed
Wash BottleWash Bottle
Drying OvenDrying Oven
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.

Tools needed:

Crucible with Lid (Porcelain)Crucible with Lid (Porcelain)
Muffle FurnaceMuffle Furnace
Crucible TongsCrucible Tongs
Heat-Resistant GlovesHeat-Resistant Gloves

Materials

1

Tools Required

14

This blueprint makes

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Zinc Oxide Powder

Free

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