Question

求段落翻译

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Answer 1

滴定管（见图1）是用来准确放出不确定量液体的容量仪器。滴定管主要用于滴定反应物直到反应出现为止。
使用滴定管
注满滴定管，关闭底部的活塞，并使用漏斗。可能需要略抬起漏斗，以让溶液自由流动。
你也可以使用一次性移液管来注满滴定管。这比漏斗为小，对10毫升滴定管更适用。请确保移液管是干燥或已用滴定剂润洗，如是则溶液的浓度不会改变。
滴定之前，用滴定剂润洗滴定管，检查滴定管畅通无阻。润洗一玻璃器皿，润洗至其表面都涂满一层滴定剂，然后沥干。润洗两次或三次可确保滴定剂的浓度不会被水滴稀释而下降。
检查滴定管尖端的气泡。将滴定管斜置，把尖端部分向上倾斜，慢慢挤压至溶液溢出，就能排出气泡。如果滴定中有气泡存在时，容量的读数可能有误的。
用洗涤瓶子的水冲洗滴定管的尖端部分，并小心风干。一分钟后，检查尖端部份的溶液，看看你的滴定管是否有泄漏。在你读取首个容量的读数之前，尖端部份应是清洁和干燥的。

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原文如下：
A buret (see Figure 1) is used to deliver solution in precisely-measured, variable volumes. Burets are used primarily for titration, to deliver one reactant until the precise end point of the reaction is reached.
Using a Buret
To fill a buret, close the stopcock at the bottom and use a funnel. You may need to lift up on the funnel slightly, to allow the solution to flow in freely.
You can also fill a buret using a disposable transfer pipet. This works better than a funnel for the small, 10 mL burets. Be sure the transfer pipet is dry or conditioned with the titrant, so the concentration of solution will not be changed.
Before titrating, condition the buret with titrant solution and check that the buret is flowing freely. To condition a piece of glassware, rinse it so that all surfaces are coated with solution, then drain. Conditioning two or three times will insure that the concentration of titrant is not changed by a stray drop of water.
Check the tip of the buret for an air bubble. To remove an air bubble, whack the side of the buret tip while solution is flowing. If an air bubble is present during a titration, volume readings may be in error.
Rinse the tip of the buret with water from a wash bottle and dry it carefully. After a minute, check for solution on the tip to see if your buret is leaking. The tip should be clean and dry before you take an initial volume reading.