Neutralise a hot solution of oxalic acid with sesquicarbonate of ammonia; evaporate and crystallise.
The crude sulphate is principally used in the preparation of sal ammoniac and sesquicarbonate of ammonia, and for manure.
The mineral soda is the sesquicarbonate, to be afterwards described.
sesquicarbonate of soda, 30 gr.; water, or peppermint water, 11⁄2 fl.
Saturate dilute sulphuric acid with sesquicarbonate of ammonia, in slight excess; filter, gently evaporate, and crystallise.
The sesquicarbonate may be artificially prepared by boiling for a short time a solution of the bicarbonate.
The bicarbonate of soda must be pure, and perfectly free from any neutral carbonate or sesquicarbonate of soda.
sesquicarbonate of soda is made of three parts or atoms of the carbonic acid, and two of the soda.
A weak solution of ammonia, or sesquicarbonate of ammonia, is also similarly employed with advantage.