某同学配制 0.1 mol·L -1 NaOH 溶液 400 mL ,然后 用草酸基准物来标定其浓度。下列有关操作或数据记录正确的是
A.
在台秤上放一称量纸,称取固体NaOH 约1.6 g
B.
用移液管移取标准草酸溶液25 mL于锥形瓶中,加入1滴甲基橙指示剂,用NaOH溶液滴定至终点
C.
W(H2C2O4) = 1.5035 g , V(H2C2O4) = 250.0 mL
D.
三次滴定NaOH溶液初始读数分别为(mL):0.00、21.46、0.10
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
微信内点击右上角“…”即可分享
反馈
参考答案:
举一反三
【简答题】The 1 ____ is sitting on a 2 ____ next to the 3 ____. The boy's 4 ____ a 5 ____ of 6 ____ and a 7 ____. There's man with a 8 ____ standing 9 ____. The girl's 10 ____ is on the 11 ____ next to the bed....
【单选题】听力原文:W: Let’s get a coffee. That speech has almost put me to sleep. M: OK. There were a few interesting points, but overall it was pretty dull. Q: What can we infer from the conversation? (18)
A.
The woman and man are students.
B.
The man thought the speech was more interesting than the woman did.
C.
The man and woman have been listening to a politician.
【简答题】One day something went wrong with a man’s bicycle chain(链条). The man could not repair it, so he looked 16 for help. The only house nearby belonged to a woman who had 17 there a few months earlier. The...
【判断题】The importance of purchasing is the cost of goods purchased, the quality of goods and services, and the timing of deliveries of goods or services.