2.24克铁粉和50ml稀硝酸刚好完全反应(硝酸还原产物是NO).向反应后所得溶液中加入50ml0.2mol/l的KI溶液,碘离子恰好被氧化成单质碘,求原稀硝酸的物质的量浓度

2.24克铁粉和50ml稀硝酸刚好完全反应(硝酸还原产物是NO).向反应后所得溶液中加入50ml0.2mol/l的KI溶液,碘离子恰好被氧化成单质碘,求原稀硝酸的物质的量浓度
2.24克铁粉和50ml稀硝酸刚好完全反应(硝酸还原产物是NO).向反应后所得溶液中加入50ml0.2mol/l的KI溶液,碘离子恰好被氧化成单质碘,求原稀硝酸的物质的量浓度

2.24克铁粉和50ml稀硝酸刚好完全反应(硝酸还原产物是NO).向反应后所得溶液中加入50ml0.2mol/l的KI溶液,碘离子恰好被氧化成单质碘,求原稀硝酸的物质的量浓度
n（Fe3+）=0.2×0.05=0.01mol
n（Fe）=2.24/56=0.04mol
总反应：Fe+HNO3---Fe（NO3）3+Fe（NO3）2+NO
0.01 0.03
0.03e 0.06e 0.09/3=0.03
n（HNO3）=0.03+0.06+0.03=0.12mol
c（HNO3）=0.12/0.05=2.4mol/L

That day I told the story of Sima Guang drop tank, and then ask questions. My intention is to give students Sima Guang smart or witty, brave and the like, and then make the best students to learn. Stu...

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That day I told the story of Sima Guang drop tank, and then ask questions. My intention is to give students Sima Guang smart or witty, brave and the like, and then make the best students to learn. Students have raised their hands, and actively speak it makes me warm and happy.
the first question a student almost makes me depressed out.
she asked: teacher, what is the tank?
I faint! your junior high school, and do not know what is the tank? Hey! Also, how can tank the city now, no wonder kids do not know. Most students see the same puzzled look at me, I had to draw on the blackboard had a cylinder shape, to tell you, the cylinder is a common household containers.
second student question is: where to buy the tank? How much is one?
I said, this issue is not important, the next one!
to the student asked me: very important, the teacher, if the cylinder is very expensive, I will not be home to the most expensive computer I smashed it?
I glared at him, it Sima Guang-cylinder is not home. The next student!
third student asked: What cylinder is used for?
is a super naive question. A student cut in and said: \
I had to explain that: In ancient times, each with a cylinder is designed to catch water.
fourth student immediately asked: their homes are often without water or less water it?
view of history lesson for students is really important. Shall be construed: was no running water, people are taking to the river or well water tank every day existence.
not even tap water, indicating that ancient people stupid, or our modern understanding. The student issued with emotion.
fifth of students: where to put the tank?
You idiot! I said to myself. I am a bit impatient, and rebuked the teacher telling a story he has just why go? Is not without carefully listening? I clearly told on the yard for a while you Zhanzhao Ting!
his defense: the teacher I have been listening, I mean is that the cylinder placed on where in the yard? A wall or door of the court or the Court under the eaves or the hospital in the middle?
could I know! Sima Guang, have left no detailed description of the memoirs, say it all fell into place where children do not go? Do not look for excuses to continue doing it now!
sixth students: Why did not cover that tank?
child if the lid will not fall down. Say should be said that the ancient people of Health ah, no cover, dust, dirt what insects are inside out, people will get sick eating ... ... ... ...
This is what I like what it! Has a lid, and fell to one side. I realized that this question is not a way to go, bunch of stupid fix will be out of touch on faint and had to come up with the old time-tested way to comprehend the question and strong good student. I motioned Sports Committee.
Sports Committee: \Was going to say and I head meter eighty tall, but I have not seen such a high cylinder, can be too short Sima Guang also do not save.
Labour members see my hands: so high, how the child up for?
a ladder or jumping from a height into the? I can not go up for. How big rock? Sima Guang, how much? Sima Guang told the teacher when your child is, he hugged move large stones? If the water tank was not deep enough, the children do not fall into danger, they do not save. This guy I have ashen face despite the self-serving to go on.
As to save enough to prove that the water tank or a full tank of deep water. Can withstand the pressure of so much water that the tank did not break the cylinder wall is thick enough to strong enough. Sima Guang, since just little kids, hold not move big stones, then he took a small stone that is thick enough to shatter solid enough vats it? No way! Even if he took out 铁杵磨成针 spirit, about to drop under the patient until the smashed so far, even if he ultimately smashed the tank really, that a child drowned early estimates, so ... ...
Stop ! I stopped him to go on. This kid was really good in physics. I hope in the final squad leader who: Sima Guang hit cylinder from the story of what you get inspired?
squad leader to stand up to see the students looking forward to the eyes, took a deep breath: \> vomited blood, and I stumble on the podium. Sima Guang! Why did you drop tanks?

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