The acid, when distilled slowly, is decomposed and yields a and 0-angelica lactones.
The two last classes number over 400,000 (1903), but the quantity of alcohol distilled by them is small.
When distilled with phosphoric anhydride they yield nitriles.
It is a white crystalline solid of melting point 43° C.; it boils at 210° C., and it can be distilled without decomposition.
Boron can be estimated by precipitation as potassium fluoborate, which is insoluble in a mixture of potassium acetate and alcohol, For this purpose only boric acid or its potassium salt must be present; and to ensure this, the borate can be distilled with sulphuric acid and methyl alcohol and the volatile ester absorbed in potash.
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