篇一 :实验一 分析天平的使用

实验1  分析天平的称量练习

分析天平是定量分析中重要而又常用的精密仪器之一。常用的分析天平最大负载为200g,分度值(感量)为0.1mg。实验室常用的是半自动电光天平(例如,TG-328B型半自动电光天平)。电光天平可直接读取0.1mg,故又称万分之一分析天平。

一、实验目的

掌握电光天平的结构、使用规则和称量方法。

二、称量时的基本要求

1.       称量前应使用天平箱内部清洁、环码挂在固定的钩上、天平保持水平等,否则需用软毛刷清扫和做必要的调节。然后测定天平零点。

2.       加重或加重时,必须先把天平梁托起(天平休止)。

3.       砝码必须用砝码镊子夹取,且要轻拿轻放。砝码放在右侧天平盘上。加减环码时应一档一档地转动环码旋钮,防止跳落或串位。

4.       称量和读取数值时,必须关上天平门。

5.       化学试剂或是的物体必须放入小烧瓶或称量瓶中称重。放在左侧天平盘上。过热或过冷的物体应在天平室内干燥器中放置15~30min后再称量。吸湿性或挥发性的物质,须放在密闭容器中称量。

…… …… 余下全文

篇二 :分析天平的使用实验报告

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篇三 :实验四 分析天平称量练习 实验报告参考

实验教案  实验四   分析天平称量练习

一、   实验目的

1.掌握直接称量法、固定质量称量法和递减称量法。

  2. 练习并熟练掌握分析天平的基本操作和常用称量方法。

 3  .培养准确,整齐,简明记录实验原始数据的习惯。

二、  实验用品

托盘天平;半机械加码电光分析天平;电子天平;表面皿;称量瓶;纸条;烧杯等。

三、实验原理

 (一)分析天平的称量方法

分析天平的称量方法一般有直接称量法,固定质量称量法和递减称量法三种。

1  接称量法(又称直接法)

该法一般用于称量某一不吸水、在空气中性质稳定的固体(如坩锅、金属、矿石等)准确质量。称量时,将被称量物直接放入分析天平中,称出其准确质量。

2  定质量称量法

该法一般用于称取某一固定质量的试样(一般为液体或固体的极细粉末,且不吸水,在空气中性质稳定)。称量时先在分析天平上称出干净且干燥的器皿(一般为烧杯、坩锅、表面皿等)的准确质量,再将分析天平增加固定质量的砝码后,往天平的器皿中加入略少于固定质量的试样,再轻轻震动药匙使试样慢慢撒入器皿中,直至其达应称质量的平衡点为止。

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篇四 :分析天平实验测试报告

评分标准:

1、分析天平水平、零点调节正确,灵敏度调节达到要求;(20分)

2、物理天平、分析天平使用正确,数据记录无误;(20分)

3、数据处理正确;(40分)

4、问答题答案要点(20分):

(1)用分析天平测物体的质量前,要对待测物体进行粗测。

(2)天平调节以及测量过程中要注意随手关玻璃门。

    (3)只有当判断天平哪一侧较重时,才旋转止动旋钮到底支起横梁,并在判明后慢慢将其止动。不能在横梁支起时打开玻璃门对天平进行操作加减砝码、钩码或取放物体。

    (4)称衡时,被测物体放在左盘,右盘上加砝码。根据待测物体的粗测质量,加适当的钩码和砝码,支起天平,判明轻重后再调整钩码和砝码。调整钩码和砝码依照从重到轻的顺序。

    (5)转动钩码旋钮时,避免用力过猛。取放砝码时要用镊子,用过的砝码要直接放到砝码盒中原来的位置。

(6)称衡后,要检查横梁是否已落下,钩码是否完全吊起,砝码是否完全放入砝码盒中原来的位置,玻璃门是否关上。

分析天平实验测试报告

小球的粗测质量mo =                g.

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篇五 :高老师自用教案分析天平称量练习 有实验报告模板

实验教案  实验四   分析天平称量练习

一、   实验目的

1.掌握直接称量法、固定质量称量法和递减称量法。

  2. 练习并熟练掌握分析天平的基本操作和常用称量方法。

 3  .培养准确,整齐,简明记录实验原始数据的习惯。

二、  实验用品

托盘天平;半机械加码电光分析天平;电子天平;表面皿;称量瓶;纸条;烧杯等。

提问:

一、分析天平的构造

(1)   最重要的是天平梁,天平梁上有什么?玛瑙刀,有几个,方向,还有平衡调节螺丝;

(2)   指针:偏向左说明那个重?

(3)   升降枢:开关,打开,天平梁放下,电源开,灯亮。两种状态。“半开”还是“全开”状态

(4)   吊耳:玛瑙平板和,挂钩、托蹬

(5)   秤盘:左边、右边

(6)   砝码和圈码:圈码的质量:10mg -990mg

1000mg,也说是1g 以上如何读?10mg以下如何?

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篇六 :高老师基础化学实验教案 有报告模板 台秤和分析天平的使用

实验三  台称及分析天平的使用方法

预习提要:

预习内容p19~p29,p58~p59。

1、目前国内应用最广泛的天平有哪些?

2、了解等背臂双盘电光天平的构造?

3、加减砝码的原则是什么?如何判断天平两盘的轻重?

4、理解下列名词:天平的零点、灵敏度、分度值、平衡点、停点、示值变动性。

5、天平的质量检验有哪几项?如何检验?

6、什么是零点和平衡点?如何调节天平的零点?

7、测定天平灵敏度的步骤是什么?

8、掌握分析天平的使用规则。

9、使用分析天平称量前,应做哪些准备工作?

10、在使用分析天平时,你准备如何保护天平的玛瑙刀口?

11、什么是天平的稳定性、灵敏性、示值变动性和不等臂性?

12、使用中的分析天平,应具有怎样的稳定性和灵敏性?

13、TG-328A型和B型天平的主要不用之处有那些?

14、为什么在称量时,只准开天平箱的侧门而不能开前门?如读数时,没有关天平门时有什么影响?

15、称量的规则有哪些,有哪几条为保护玛瑙刀刃而规定的?

16、如何使用称量瓶、干燥器的。

17、称量前应如何检查天平?

18、在试重过程中要注意什么?

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篇七 :分析化学实验报告

基础化学实验(二)


面 向 21 世 纪 课 程 教 材

  第三版

 

华中师范大学

东北师范大学

陕西师范大学

北京师范大学

高等教育出版社

分析化学实验

Analytic Chemistry Experiments

  安全教育及课程要求

一、安全知识

一)对分析仪器的使用要求

1.实验所使用的玻璃仪器按清单清点后为一人一套,如有损坏,应按价赔偿。

2.实验中所使用的精密仪器应严格按操作规程使用,使用完后应拔去插头,仪器各旋钮恢复至原位,在仪器使用记录本上签名并记录其状态。

3.实验时应节约用水、用电,实验器材一律不得私自带离实验室。

二)、对试剂药品的使用要求

1.实验室内禁止饮食、吸烟,不能以实验容器代替水杯,餐具使用,防止试剂入口,实验结束后应洗手。

2.使用As2O3、HgCl2等剧毒品时要特别小心,用过的废物、废液不可乱倒,应回收或加以特殊处理。

3.使用浓酸、浓碱或其他具有强烈腐蚀性的试剂时,操作要小心,防止溅伤和腐蚀皮肤、衣物等。对易挥发的有毒或有强烈腐蚀性的液体或气体,应在通风橱中操作。

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篇八 :分析天平称量练习

分析化学实验教学指导

分析天平称量练习

一、 实验目的

1、 练习并熟练掌握分析天平的基本操作和常用称量方法。

2、 培养准确、整齐、简明记录实验原始数据的习惯。

二、 实验原理(强调学生一定要阅读实验书。P108-118页:)

(三)分析天平使用方法。P 112-113页 (五) 称量方法。P 115-117页

(六)使用天平注意事项。P 117-118页

本次实验使用电光分析天平。电子天平待做完酸碱滴定实验后,才开始使用。

三、 实验步骤

1、 直接称量法:准确称量各自的称量瓶瓶身、瓶盖,称量瓶瓶身+瓶盖。

2、 固定称量法:称取0.5000g K2Cr2O7试样一份。

3、 递减称量法:称取0.3~0.4 g K2Cr2O7试样三份。

4、

四、教师示范

1、固定质量称量法最后加少量样品的操作。

2、差减法敲样品入小烧杯(或锥形瓶)的操作。

五、 几点具体要求

1、 称量瓶、表面皿、小烧杯的准备。最好在前一次实验后先洗净,晾干。当堂要用时,可

将称量瓶、表面皿冼净后,放在烘箱烘干,凉至室温后使用。

2、 强调使用前先看水平、砝码、称盘;不论是“半开”还是“全开”状态,一律不得取放

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