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Bismuth Oxide: Subnitrate Boiled with Sodium Hydroxide Solution (British Pharmacopoeia, 1907)
Boil bismuth subnitrate with sodium hydroxide solution: bismuth hydroxide falls and sodium nitrate stays dissolved. At 100 °C the hydroxide loses its water, leaving bismuth oxide, a dull lemon-yellow powder.
Source: The Dispensatory of the United States of America (1907), Bismuthi Oxidum, after the British Pharmacopoeia. Not given: amounts, strength or time; those are stated as not given. The 10 % lye, washing and filter are ours. Picture drawn by Youblob.
Intermediate
half a day
Instructions
1
1
Boil the subnitrate with soda lye
Boil the subnitrate with soda lye
Boil bismuth subnitrate with sodium hydroxide solution (ours: 10 %). Bismuth hydroxide is precipitated; sodium nitrate stays in solution. Not given: amounts and time. Goggles and gloves.
Materials for this step:
Bismuth Subnitrate1 as requiredTools needed:
Sodium Hydroxide - 10% solution
Borosilicate Beaker
Hot Plate
Chemical Splash Goggles
Nitrile Gloves2
2
Wash and dry to the oxide
Wash and dry to the oxide
Filter off the precipitate and wash it (ours: with distilled water). Hold it at 100 °C: the hydroxide gives up its water and dull lemon-yellow bismuth oxide remains.
Tools needed:
Filter Paper
Distilled Water
Drying OvenMaterials
1- 1 as requiredPlaceholder
Tools Required
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