早稲田理工2007 III

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和訳はこちら

Student: Excuse me, Ms. Howard, but do you have a minute?

Teacher: Yes, I do. How can I help you?

Student: I was wondering Could you help me sort out this problem? I can't work my way through the instructions.

Teacher: Which part are you having trouble with?

Student: Well, I'm not really sure how to start.

Teacher: Do you have eight small containers?

Student: Yes.

Teacher: Well, first you have to put four drops of water into each of them. Then after that you have to add one drop of potassium iodide (KI) solution to the first container, two drops to the second, and so forth. At the end you have to add eight drops of the chemical to the last container.

Student: I can't add a drop at a time. What should I do to make sure that I'm only adding one drop at a time?

Teacher: Why not use this? This is like a straw. It's called a pipette. First suck in a small amount of the solution, and then place your thumb over the hole at the top to stop the solution from escaping. Then, if you move your thumb a little like this, you can add the number of drops you need.

Student: Okay, I see. I was trying to pour the solution into the containers.

Teacher: Well, obviously that won't work, because you can't measure the number of drops effectively. Do you think you'll be able to do it yourself from here?

Student: Well, next I need to place one drop of lead nitrate (Pb(N03)2) solution in the first container; two in the second, three in the third and so on.

Teacher: That's not quite right. Read what it says here.

Student: "Add eight drops of lead nitrate solution to the first container, seven drops to the second, and so forth. End by adding one drop of lead nitrate to the eighth container." Oh...I see what I was doing wrong now. Thanks to your help, I think I can get it done by myself now. Thank you.

Teacher: No problem. If you have any further questions, don’t hesitate to ask.

Student: You know me. I'm always the first to ask for help.

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