Boil 0.5 g of the powdered tablets for 2 to 3 minutes with 10 mL of 5 M sodium hydroxide, cool and add an excess of 1　M sulfuric acid; a crystalline precipitate is produced. To a solution of the precipitate in water add iron (III) chloride solution R1; a（

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Boil 0.5 g of the powdered tablets for 2 to 3 minutes with 10 mL of 5 M sodium hydroxide, cool and add an excess of 1　M sulfuric acid; a crystalline precipitate is produced. To a solution of the precipitate in water add iron (III) chloride solution R1; a（）colour is produced.

A.turquoise blue

B.deep violet

C.sandy brown

D.smoky grey

正确答案：deep violet

Tag：医药英语时间：2022-01-12 15:47:43

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Boil 0.5 g of the powdered tablets for 2 to 3 minutes with 10 mL of 5 M sodium hydroxide, cool and add an excess of 1 M sulfuric acid; a crystalline precipitate is produced. To a solution of the precipitate in water add iron (III) chloride solution R1; a（

Boil 0.5 g of the powdered tablets for 2 to 3 minutes with 10 mL of 5 M sodium hydroxide, cool and add an excess of 1　M sulfuric acid; a crystalline precipitate is produced. To a solution of the precipitate in water add iron (III) chloride solution R1; a（