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Copper Carbonate: Blue Vitriol Precipitated with Washing Soda
Pour washing soda into a solution of copper sulfate and a pale blue sludge falls out; warm it and it turns into a dense green powder. George Fownes (1856) gives this as the way the pigment is made; it is close in make-up to the mineral malachite. Potters and glassmakers use it as a copper colour.
The picture: a heap of basic copper carbonate powder.
Beginner
A day with drying
Instructions
1
1
Two solutions
Two solutions
Dissolve the copper sulfate in one beaker of warm water and the washing soda in another.
Materials for this step:
Copper Sulfate Pentahydrate (CuSO₄·5H₂O)250 g
Washing Soda290 g
Water2 litersTools needed:
Balance Scale
Glass Beaker
Hot Plate
Chemical Splash Goggles
Rubber Gloves2
2
Pour in the soda
Pour in the soda
Pour the soda slowly into the copper, stirring; it froths as gas comes off. A pale blue sludge falls out. Stop when more soda no longer makes any.
Tools needed:
Glass Beaker
Glass Stirring RodChemical Splash GogglesRubber Gloves3
3
Warm it green
Warm it green
Warm the mixture gently and stir. Fownes: the precipitate becomes dense and turns green.
Tools needed:
Glass BeakerHot PlateGlass Stirring Rod4
4
Wash and dry
Wash and dry
Filter it, wash it several times with clean water to take out the sodium sulfate, and dry it in a dish at low heat. Store the powder in a closed jar.
Materials for this step:
Water2 litersTools needed:
Filter Paper
Glass Funnel - Stemmed
Evaporating Dish
Glass JarChemical Splash GogglesRubber Gloves5
5
Soda for the copper
Soda for the copper
Loading Jupyter Notebook...
6
6
Limits
Limits
The precipitation and the change to green are Fownes's; the quantities are ours. Copper salts are harmful if swallowed; do not breathe the dry powder.
Materials
3- Placeholder
- 290 gPlaceholder
- 4 litersPlaceholder
Tools Required
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