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【简答题】
阿司匹林肠溶片含量的测定 精密称取片粉适量(约相当于阿司匹林 0.3g ),加入中性乙醇溶解后,加入酚酞 3 滴,滴加 NaOH 滴定液( 0.1mol/L )至溶液显粉红色。 ( 此时中和了存在的游离酸,阿司匹林也同时成为 Na + ) , 再精密加入 NaOH 滴定液( 0.1mol/L ) 40ml ,置水浴上加热使酯结构水解,迅速放室温,再用 H 2 SO 4 滴定液( 0.05mol/L )滴定剩余的碱,并将滴定结果用空白试验校正。 1ml NaOH 滴定液 (0.1mol/L) 相当于 18.02 mg 的 C 9 H 8 O 4 。 已知: 阿司匹林 10 片重: 1.824g , W 称片粉重 : 0.5312g V H2SO4 (空): 20.18ml ; V H2SO4 (样): 3.02ml C NaOH : 0.1032mol/L , C H2SO4 : 0.05120ml/L ,标示量: 0.1g 求:标示量的百分含量?
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参考答案：
举一反三
【单选题】Which of the following is an immediate effect of an increase in money supply by the European Central Bank by 10 percent?
A.
There will be an inflow of foreign capital in the countries belonging to the European Union.
B.
The expected exchange rate value of the foreign currencies vis-à-vis the Euro will increase.
C.
The interest rate in the EU countries will increase.
D.
The product prices in the EU countries will decline drastically.
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【简答题】胚胎来源于受精卵分化的细胞群中的
查看完整题目与答案
【单选题】当在幻灯片中插入了声音以后,幻灯片中将会出现
A.
喇叭标记
B.
一段文字说明
C.
一个按钮
D.
超链接按钮
查看完整题目与答案
【单选题】International Business Negotiation can be as a process in which two or more parties belonging to different countries or cultures come together to discuss the common and conflicting business interest.
A.
understand
B.
understood
C.
understanding
查看完整题目与答案
【单选题】Countries belonging to a ________ maintain whatever policies they see fit against nonmember countries.
A.
economic union
B.
customs union
C.
common market
D.
free trade area
查看完整题目与答案
【多选题】计算机的逻辑安全主要实现方法有
A.
口令
B.
加密
C.
检查日志
D.
1． 文件许可使用
查看完整题目与答案
【单选题】Which of the following is an immediate/short-term effect of an increase in money supply by the European Central Bank by 10%?
A.
There will be an inflow of foreign capital to the countries belonging to the European Union.
B.
The expected exchange value of the foreign currencies will appreciate relative to euro by more than 10%.
C.
The interest rate in the EU countries will increase.
D.
The product prices in the EU countries will rise immediately.
查看完整题目与答案
【判断题】组培过程中形成的胚状体器官与一般种子中的胚的来源一样,都能同时发育成具有根、茎、叶的植株,但二者的来源不一样,其中胚状体来源于体细胞,而种子中的胚来源于受精卵细胞。
A.
正确
B.
错误
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【单选题】口语交流中, 在一个音节的末尾加上一个卷舌动作,使这个音节的韵母具有一种卷舌的色彩,这就是:
A.
轻声
B.
儿化
C.
变调
D.
声音化妆
查看完整题目与答案
【判断题】组培过程中形成的胚状体器官与一般种子中的胚的结构一样,都能同时发育成具有根、茎、叶的植株,但二者的来源不一样,其中胚状体来源于体细胞,而种子中的胚来源于受精卵细胞。
A.
正确
B.
错误
查看完整题目与答案
相关题目：
【单选题】Which of the following is an immediate effect of an increase in money supply by the European Central Bank by 10 percent?
A.
There will be an inflow of foreign capital in the countries belonging to the European Union.
B.
The expected exchange rate value of the foreign currencies vis-à-vis the Euro will increase.
C.
The interest rate in the EU countries will increase.
D.
The product prices in the EU countries will decline drastically.
查看完整题目与答案
【简答题】胚胎来源于受精卵分化的细胞群中的
查看完整题目与答案
【单选题】当在幻灯片中插入了声音以后,幻灯片中将会出现
A.
喇叭标记
B.
一段文字说明
C.
一个按钮
D.
超链接按钮
查看完整题目与答案
【单选题】International Business Negotiation can be as a process in which two or more parties belonging to different countries or cultures come together to discuss the common and conflicting business interest.
A.
understand
B.
understood
C.
understanding
查看完整题目与答案
【单选题】Countries belonging to a ________ maintain whatever policies they see fit against nonmember countries.
A.
economic union
B.
customs union
C.
common market
D.
free trade area
查看完整题目与答案
【多选题】计算机的逻辑安全主要实现方法有
A.
口令
B.
加密
C.
检查日志
D.
1． 文件许可使用
查看完整题目与答案
【单选题】Which of the following is an immediate/short-term effect of an increase in money supply by the European Central Bank by 10%?
A.
There will be an inflow of foreign capital to the countries belonging to the European Union.
B.
The expected exchange value of the foreign currencies will appreciate relative to euro by more than 10%.
C.
The interest rate in the EU countries will increase.
D.
The product prices in the EU countries will rise immediately.
查看完整题目与答案
【判断题】组培过程中形成的胚状体器官与一般种子中的胚的来源一样,都能同时发育成具有根、茎、叶的植株,但二者的来源不一样,其中胚状体来源于体细胞,而种子中的胚来源于受精卵细胞。
A.
正确
B.
错误
查看完整题目与答案
【单选题】口语交流中, 在一个音节的末尾加上一个卷舌动作,使这个音节的韵母具有一种卷舌的色彩,这就是:
A.
轻声
B.
儿化
C.
变调
D.
声音化妆
查看完整题目与答案
【判断题】组培过程中形成的胚状体器官与一般种子中的胚的结构一样,都能同时发育成具有根、茎、叶的植株,但二者的来源不一样,其中胚状体来源于体细胞,而种子中的胚来源于受精卵细胞。
A.
正确
B.
错误
查看完整题目与答案
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