reg 6
In forcetransfer residue to a platinum dish, evaporate to dryness, ignite, and weigh (residue A)
6 transfer residue to a platinum dish, evaporate to dryness, ignite, and weigh (residue A)
7 treat the residue with 5mL of hydrofluoric acid, containing 0.5mL of concentrated sulphuric acid, then heat on water bath for 1 hour, evaporate to dryness over flame, ignite and weigh (residue B)
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