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acetic acid acetone added water alcohol alkali ammonia ammonium amount apparatus aqueous benzene boiling bulb c.c. of water cacao calcium calculated carbon dioxide cent Chem chemical Chemistry chemists Chim chloride cobalt cocoa colour combustion compounds concentrated condenser containing cooled copper crucible determined dilute dissolved distilled dried error estimation ether evaporated excess extract filtered filtrate flask gives glass grms heated hydrochloric acid hydrogen sulphide ignited insoluble iodine iron lime liquid litre mercury method methyl mgrm milk minutes mixture morphine nitric acid nitrogen obtained oxide oxidised percentage permanganate phenol phosphate platinum potassium iodide precipitate present Public Analysts pure pyridine reaction reagent refractive index residue salts sample separated shell silica small quantities sodium carbonate sodium hydroxide solids-not-fat soluble solvent standard starch substances sugar sulphate sulphuric acid tartaric acid temperature thiosulphate titrated treated tube vapour volume washed weight whilst zinc