100mg供试品这里指的是溶质氯化钠,即应该取1.0 mL 10%氯化钠溶液.
Sodium and Sodium Salts
Dissolve 0.1 g of the substance to be examined in 2 ml of water R or use 2 ml of the prescribed solution. Add 2 ml of a 150 g/l solution of potassium carbonate R and heat to boiling. No precipitate is formed. Add 4 ml of potassium pyroantimonate solution R and heat to boiling. Allow to cool in iced water and if necessary rub the inside of the test-tube with a glass rod. A dense white precipitate is formed.