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水楊酸鈉 10.0 碳酸氩鈉 5.0 焦糖色适量水加至 100.0 Ⅰ.精确吸取檢品0.5ml 放于一小分液漏斗内,加5 ml中性醚及甲橙指示液一滴,以0.1N鹽酸滴定至水溶液呈橙紅色,記下讀數。再加入过量的稀鹽酸,振搖后分取乙醚層,川水洗滌乙醚二次,(?)去洗液將乙醚轉移于一三角燒瓶内,小心蒸干,在水杨酸殘渣內加入5 ml中性醇及酚酞指示剂一滴,用0.1N氢氧化钠液滴定至溶液呈粉紅色。 (0.1 N盐酸ml数一0.1N氢氧化钠ml数)(?)碳酸氫鈉所消耗的ml数。合格范围:2.83 ml—3.12 ml. 0.1 N氢氧化鈉液的ml数(?)水楊酸鈉所消耗的ml数。合格范圍:2.97 ml.—3.29 ml. Ⅱ.精确吸取檢品0.5 ml放于一小燒瓶内,加10ml水及二滴甲红指示液,以0.1 N鹽酸滴至溶液呈紅色,记下讀数(a)(?)碳酸氢鈉所消耗之ml数。
Sodium salicylate 10.0 Sodium hydrogen carbonate 5.0 Caramel color Appropriate amount of water Addition to 100.0 I. Accurate absorption of seized goods 0.5ml placed in a small separatory funnel, add 5 ml of neutral ether and a drop of orange indicator solution, 0.1N hydrochloric acid Titrate to aqueous orange-red, write down the readings. Add an excess of dilute hydrochloric acid, shake the points after the ether layer was washed twice with diethyl ether, (?) To wash the ether was transferred to a Erlenmeyer flask, carefully evaporated to dryness, salicylic acid residue was added 5 ml A drop of neutral alcohol and phenolphthalein indicator, with 0.1N sodium hydroxide solution until the solution was pink. (0.1 N hydrochloric acid ml 0.1N sodium hydroxide ml) (?) The amount of sodium bicarbonate consumed ml. Eligibility: 2.83 ml-3.12 ml 0.1 ml Sodium hydroxide solution ml (?) The amount of sodium salicylate consumed. The qualified range: 2.97 ml.-3.29 ml. Ⅱ accurately draw the seized goods 0.5 ml placed in a small flask, add 10ml of water and two drops of a red indicator solution, 0.1N hydrochloric acid drops to the solution was red, write down the readings (a) (?) The amount of sodium bicarbonate consumed.