篇一 :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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篇二 :分析天平的称量练习

分析天平的称量练习

一 实验目的

1. 掌握电子天平的正确使用方法

2. 熟悉直接称量法、固定质量称量法和减量称量法的操作方法

3. 了解分析天平的结构及原理

二 基本原理

分析天平是用于化学分析和物质精确测量的高准确度天平。这类天平的最小分度

5值都小于最大称量的 10。广义的天平包括双盘等臂机械天平、单盘不等臂机械天平

和电子天平。机械天平根据杠杆平衡原理设计,当天平平衡时,物体的质量等于砝码的质量;而电子天平根据电磁力平衡原理设计。

电磁力平衡传感器主要应用在电子天平上,电子天平的重要特点是在测量被测物体的质量时不用测量砝码的重力,而是采用电磁力与被测物体的重力相平衡的原理来测量的。秤盘通过支架连杆与磁场中的通电线圈连接,在称量范围内,当被测重物的重力mg通过连杆支架作用于线圈上,线圈会发生瞬间线性位移,通过电磁传感器的作用会使得线圈中电流增大,线圈将产生一个增大的电磁力F,电磁力F和秤盘上被测物体重力mg大小相等、方向相反而达到平衡,同时在弹性簧片的作用下使秤盘支架回复到原来的位置。F = KBLI = mg。处在磁场中的通电线圈,流经其内部的电流I与被测物体的质量成正比。通过电流信号的测量就可以测量物体的质量。

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篇三 :实验二分析天平称量练习

实验二分析天平称量练习

一、实验目的

分析天平的称量练习,学会熟练地使用分析天平,训练准确称取一定量的试样。

二、实验用品

1、半自动电光天平一台,并附有砝码一套;2、镊子和药勺各一把;3、洁净干燥的瓷坩埚二个;4、装有石英砂的称量瓶一个。

三、实验内容

1、天平的检查

检查天平是否保持水平,天平盘是否洁净。若不干净,可用软毛刷刷净。天平各部件是否在原位。

2、天平零点的检查和调整

启动天平,检查投影屏上标尺的位置,如果零点与投影屏上的标线不重合,可拨动旋钮附近的板手,挪动投影屏位置,使其重合。

3、直接称量法

首先用铅笔在两个坩埚底部分别标上“1”号、“2”号,然后左手用镊子夹取1号瓷坩埚,置于天平左盘中央,右盘加砝码,用转动指数盘自动加取1g以下圈码。

待天平平衡后,记下盘中砝码重量、指数盘的圈码重量,并从投影屏上直接读出10mg以内的重量,即为1号坩埚的重量w1。再用药勺在坩埚内加石英砂0.9000~1.1000g(注意:石英砂不要洒在天平盘上),称出其准确重量,记下w2。求出石英砂的准确重量w

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篇四 :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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篇五 :分析天平简介和称量练习

                                         分析天平简介和称量练习

〖实验目的〗

(1)了解分析天平的构造,掌握分析天平的使用方法和使用规则。

(2)学会直接称量法和差减称量法。

〖实验用品〗  

 仪器: TG-328B型(或其它型号)半自动电光分析天平250ml锥形瓶、称量瓶、表面皿

〖实验原理〗

分析天平是定量分析的常用的基准计量仪器。了解分析天平的构造和性能, 正确地进行称量是做好定量分析实验的基本保证。

分析天平按结构的特点分出等臂和不等臂两大类,分析天平按精度分级和命名是常用的分类方法,过去天平的分级单纯以能称准的最小质量来定。例如能称到0.1mg到0.2mg的天平称为“万分之一天平”或“分析天平”;能称到0.01mg〖的天平称为“十万分之一天平”或“半微量分析天平”等。因为分度值与载重量有密切关系,所以只考虑分度值而不与载重量联系起来的分类方法是不能全面反映天平的性能的。目前我国采用的是以天平分度值与最大载荷之比来划分其精度级别的分类法。按《天平检定规程JJG98-72》(试行本)的规定,把天平分为10级、如表2.4.1所示。

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篇六 :分析天平的使用实验报告

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font-family:媅SO'>b$<span lang=EN-US>TAR</span>n鰱0籗畍.?</span></p> <p class=p0 style='text-indent:21.0pt'><span style='font-size:10.5pt; font-family:媅SO'>n筟hV嶯饄豽 N ?>f:y鶴筟hV剉(嵪??6qT{? c<span lang=EN-US>TAR</span>.? ?>f:y坢悥 ?彇sS鶴皊hQ鰱秗` ?筟hV(嵪?>f:y TAR,</span>>f:yhV:NhQ鰱 ?sS)Ys^n鰱0</span></p> <p class=p0 style='text-indent:21.0pt'><span lang=EN-US style='font-size:10.5pt; font-family:媅SO'>&nbsp;</span></p> <p class=MsoListParagraph style='text-indent:0cm;line-height:18.0pt;layout-grid-mode: char;text-autospace:none'><span style='font-size:10.5pt'> N0瀃寶蚫\Oek</span></p> <p class=MsoListParagraph style='line-height:18.0pt;layout-grid-mode:char; text-autospace:none'><span lang=EN-US style='font-size:10.5pt'>1.</span><span style='font-size:10.5pt'>O(uek?</span></p> <p class=MsoListParagraph style='line-height:18.0pt;layout-grid-mode:char; text-autospace:none'><span lang=EN-US style='font-size:10.5pt'>(1)</span><span style='font-size:10.5pt'>錱 w4ls^闚 ?俌 N4ls^ ?亯惽?4ls^寕??岓?4ls^0</span></p> <p class=MsoListParagraph style='line-height:18.0pt;layout-grid-mode:char; text-autospace:none'><span lang=EN-US style='font-size:10.5pt'>(2)</span><span style='font-size:10.5pt'>?5u恘 ?剺韕<span lang=EN-US>30min</span>T ?筫颯_/T>f:yhV蹚L埻d\O0</span></p> <p class=MsoListParagraph style='line-height:18.0pt;layout-grid-mode:char; text-autospace:none'><span lang=EN-US style='font-size:10.5pt'>(3)</span><span style='font-size:10.5pt'>{? c<span lang=EN-US>ON</span>>f:y.?T ?鶴皊<span lang=EN-US>0.OOOOg</span>饄蠎!j_T筫颯饄蠎0</span></p> <p class=MsoListParagraph style='line-height:18.0pt;layout-grid-mode:char; text-autospace:none'><span lang=EN-US style='font-size:10.5pt'>(4)</span><span style='font-size:10.5pt'>\饄蠎ir{?>e(W饄豽-N.Y ?卂>f:yhV NpeW[3z歔T鶴皊(嵪慤SMO<span lang=EN-US>g,</span>sS颯麐pe ?v^皨U_饄蠎觺済0</span></p> <p class=MsoListParagraph style='line-height:18.0pt;layout-grid-mode:char; text-autospace:none'><span lang=EN-US style='font-size:10.5pt'>2.</span><span style='font-size:10.5pt'>饄蠎筫誰?</span></p> <p class=MsoListParagraph style='line-height:18.0pt;layout-grid-mode:char; text-autospace:none'><span lang=EN-US style='font-size:10.5pt'>(1)</span><span style='font-size:10.5pt'>鶹歔饄蠎誰<span lang=EN-US>(</span>蟢齆饄諷體駛x<span lang=EN-US>0.5000g)</span>?</span></p> <p class=MsoListParagraph style='line-height:18.0pt;layout-grid-mode:char; text-autospace:none'><span style='font-size:10.5pt'>諷Nr^繯h坆椏v ?>eeQ5uP[)Ys^匭 ?卂>f:y芉nx(嵪?T ? c<span lang=EN-US>TAR(</span>n鰱.?<span lang=EN-US>)</span>T ?魐(u[r覊STh坆椏v-Nbaba燫7h ?髞)Ys^O\U^ N>f:y<span lang=EN-US>0.5000g</span>0</span></p> <p class=MsoListParagraph style='line-height:18.0pt;layout-grid-mode:char; text-autospace:none'><span lang=EN-US style='font-size:10.5pt'>(2)</span><span style='font-size:10.5pt'>愊Q饄蠎誰<span lang=EN-US>(</span>饄諷<span lang=EN-US>0.3-0.4g</span>體駛x$N齆<span lang=EN-US>)</span></span></p> <p class=MsoListParagraph style='line-height:18.0pt;layout-grid-mode:char; text-autospace:none'><span style='font-size:10.5pt'>`$(u鋘竳ag諷$N*Nr^繯\鏿og ?鱏R+R:N<span lang=EN-US>1</span>0<span lang=EN-US>2,</span>R+R(WR恎)Ys^ N芉nx饄蛻 ?zz鏿og(嵪懓?:N<span lang=EN-US>m<sub>0</sub></span>孴<span lang=EN-US>m<sub>1</sub></span>0</span></p> <p class=MsoListParagraph style='line-height:18.0pt;layout-grid-mode:char; text-autospace:none'><span style='font-size:10.5pt'>a$(u鋘竳ag諷Nr^繯剉饄蠎鰐 ?燫eQ<span lang=EN-US>1g</span>體駛x墊+g<span lang=EN-US>,</span>(WR恎)Ys^ N芉nx饄蛻<span lang=EN-US>(</span>芉nx髞<span lang=EN-US>0.lmg),</span>皨 NvQ(嵪?:N<span lang=EN-US>m<sub>2</sub></span>KQ0</span></p> <p class=MsoListParagraph style='line-height:18.0pt;layout-grid-mode:char; text-autospace:none'><span style='font-size:10.5pt'>b$(uN\ag鋘竳WY(W饄蠎鰐 N ?諷鶴饄蠎鰐T ?峇(uN\Gr鋘竳SOO鰐講 ?\饄蠎鰐Sb_ ?(u講{弡弐e鸔饄蠎鰐 ?l忹y體駛x<span lang=EN-US>0.3</span>^?<span lang=EN-US>0.4g</span>嶯\鏿og<span lang=EN-US>1</span>-N ?v^芉nx饄鶴饄蠎鰐孴iRYO體駛x螿\(嵪?:N<span lang=EN-US>m<sub>3</sub></span>KQ ?錘 T7h筫誰l忹y諎7h<span lang=EN-US>0.3</span>^?<span lang=EN-US>0.4g</span>嶯\鏿og<span lang=EN-US>2</span>-N ?峇芉nx饄鶴饄蠎鰐孴iRYO諎7h剉螿\(嵪?:N<span lang=EN-US>m<sub>4</sub></span>KQ0</span></p> <p class=MsoListParagraph style='line-height:18.0pt;layout-grid-mode:char; text-autospace:none'><span style='font-size:10.5pt'>c$芉nx饄鶴$N*N鏿og燫諎7h剉(嵪? ?R+R:N<span lang=EN-US>m<sub>5</sub></span>孴<span lang=EN-US>m<sub>6</sub></span>KQ0</span></p> <p class=MsoListParagraph style='line-height:18.0pt;layout-grid-mode:char; text-autospace:none'><span lang=EN-US style='font-size:10.5pt'>&nbsp;</span></p> <p class=p0><span style='font-size:10.5pt;font-family:媅SO'>踁0瀃寶penc皨U_0pencYt</span></p> <p class=p0 style='text-indent:21.0pt'><span style='font-size:10.5pt; font-family:媅SO'>?</span><span lang=EN-US style='font-size:10.5pt'>1</span><span style='font-size:10.5pt;font-family:媅SO'> ?鶹歔饄蠎誰皨U_h? </p> <table class=MsoNormalTable border=1 cellspacing=0 cellpadding=0 style='border-collapse:collapse;border:none'> <tr> <td width=284 valign=top style='width:213.05pt;border:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt'> <p class=p0><span style='font-size:10.5pt;font-family:媅SO'>!kpe</span></p> </td> <td width=284 valign=top style='width:213.05pt;border:solid windowtext 1.0pt; border-left:none;padding:0cm 5.4pt 0cm 5.4pt'> <p class=p0><span style='font-size:10.5pt;font-family:媅SO'>諎7h蛻?</span><span lang=EN-US style='font-size:10.5pt'>g</span><span style='font-size:10.5pt; font-family:媅SO'> ?</span></p> </td> </tr> <tr> <td width=284 valign=top style='width:213.05pt;border:solid windowtext 1.0pt; border-top:none;padding:0cm 5.4pt 0cm 5.4pt'> <p class=p0><span lang=EN-US style='font-size:10.5pt'>1</span></p> </td> <td width=284 valign=top style='width:213.05pt;border-top:none;border-left: none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt'> <p class=p0><span lang=EN-US style='font-size:10.5pt'>&nbsp;</span></p> </td> </tr> <tr> <td width=284 valign=top style='width:213.05pt;border:solid windowtext 1.0pt; border-top:none;padding:0cm 5.4pt 0cm 5.4pt'> <p class=p0><span lang=EN-US style='font-size:10.5pt'>2</span></p> </td> <td width=284 valign=top style='width:213.05pt;border-top:none;border-left: none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt'> <p class=p0><span lang=EN-US style='font-size:10.5pt'>&nbsp;</span></p> </td> </tr> </table> <p class=p0 style='text-indent:21.0pt'><span style='font-size:10.5pt; font-family:媅SO'>?</span><span lang=EN-US style='font-size:10.5pt'>2</span><span style='font-size:10.5pt;font-family:媅SO'> ?愊Q饄蠎誰皨U_h? </p> <table class=MsoNormalTable border=1 cellspacing=0 cellpadding=0 style='border-collapse:collapse;border:none'> <tr> <td width=189 valign=top style='width:142.0pt;border:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt'> <p class=p0><span style='font-size:10.5pt;font-family:媅SO'>饄蠎鱏</span></p> </td> <td width=189 valign=top style='width:142.05pt;border:solid windowtext 1.0pt; border-left:none;padding:0cm 5.4pt 0cm 5.4pt'> <p class=p0><span lang=EN-US style='font-size:10.5pt'>1</span></p> </td> <td width=189 valign=top style='width:142.05pt;border:solid windowtext 1.0pt; border-left:none;padding:0cm 5.4pt 0cm 5.4pt'> <p class=p0><span lang=EN-US style='font-size:10.5pt'>2</span></p> </td> </tr> <tr> <td width=189 valign=top style='width:142.0pt;border:solid windowtext 1.0pt; border-top:none;padding:0cm 5.4pt 0cm 5.4pt'> <p class=p0><span style='font-size:10.5pt;font-family:媅SO'>zz\鏿og蛻</span><span lang=EN-US style='font-size:10.5pt'>(g)</span></p> </td> <td width=189 valign=top style='width:142.05pt;border-top:none;border-left: none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt'> <p class=p0><span lang=EN-US style='font-size:10.5pt'>&nbsp;</span></p> </td> <td width=189 valign=top style='width:142.05pt;border-top:none;border-left: none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt'> <p class=p0><span lang=EN-US style='font-size:10.5pt'>&nbsp;</span></p> </td> </tr> <tr> <td width=189 valign=top style='width:142.0pt;border:solid windowtext 1.0pt; border-top:none;padding:0cm 5.4pt 0cm 5.4pt'> <p class=p0><span style='font-size:10.5pt;font-family:媅SO'>re鶴MR饄蠎鰐</span><span lang=EN-US style='font-size:10.5pt'>+</span><span style='font-size:10.5pt; font-family:媅SO'>7h蛻</span><span lang=EN-US style='font-size:10.5pt'>(g)</span></p> </td> <td width=189 valign=top style='width:142.05pt;border-top:none;border-left: none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt'> <p class=p0><span lang=EN-US style='font-size:10.5pt'>&nbsp;</span></p> </td> <td width=189 valign=top style='width:142.05pt;border-top:none;border-left: none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt'> <p class=p0><span lang=EN-US style='font-size:10.5pt'>&nbsp;</span></p> </td> </tr> <tr> <td width=189 valign=top style='width:142.0pt;border:solid windowtext 1.0pt; border-top:none;padding:0cm 5.4pt 0cm 5.4pt'> <p class=p0><span style='font-size:10.5pt;font-family:媅SO'>re鶴諎7h蛻</span><span lang=EN-US style='font-size:10.5pt'>(g)</span></p> </td> <td width=189 valign=top style='width:142.05pt;border-top:none;border-left: none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt'> <p class=p0><span lang=EN-US style='font-size:10.5pt'>&nbsp;</span></p> </td> <td width=189 valign=top style='width:142.05pt;border-top:none;border-left: none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt'> <p class=p0><span lang=EN-US style='font-size:10.5pt'>&nbsp;</span></p> </td> </tr> <tr> <td width=189 valign=top style='width:142.0pt;border:solid windowtext 1.0pt; border-top:none;padding:0cm 5.4pt 0cm 5.4pt'> <p class=p0><span style='font-size:10.5pt;font-family:媅SO'>鏿og</span><span lang=EN-US style='font-size:10.5pt'>+</span><span style='font-size:10.5pt; font-family:媅SO'>諎7h蛻</span><span lang=EN-US style='font-size:10.5pt'>(g)</span></p> </td> <td width=189 valign=top style='width:142.05pt;border-top:none;border-left: none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt'> <p class=p0><span lang=EN-US style='font-size:10.5pt'>&nbsp;</span></p> </td> <td width=189 valign=top style='width:142.05pt;border-top:none;border-left: none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt'> <p class=p0><span lang=EN-US style='font-size:10.5pt'>&nbsp;</span></p> </td> </tr> <tr> <td width=189 valign=top style='width:142.0pt;border:solid windowtext 1.0pt; border-top:none;padding:0cm 5.4pt 0cm 5.4pt'> <p class=p0><span style='font-size:10.5pt;font-family:媅SO'>饄諷諎7h蛻</span><span lang=EN-US style='font-size:10.5pt'>(g)</span></p> </td> <td width=189 valign=top style='width:142.05pt;border-top:none;border-left: none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt'> <p class=p0><span lang=EN-US style='font-size:10.5pt'>&nbsp;</span></p> </td> <td width=189 valign=top style='width:142.05pt;border-top:none;border-left: none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt'> <p class=p0><span lang=EN-US style='font-size:10.5pt'>&nbsp;</span></p> </td> </tr> <tr> <td width=189 valign=top style='width:142.0pt;border:solid windowtext 1.0pt; border-top:none;padding:0cm 5.4pt 0cm 5.4pt'> <p class=p0><span style='font-size:10.5pt;font-family:媅SO'>輣鵞頬 <span lang=EN-US style='font-size:10.5pt'>(g)</span></p> </td> <td width=189 valign=top style='width:142.05pt;border-top:none;border-left: none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt'> <p class=p0><span lang=EN-US style='font-size:10.5pt'>&nbsp;</span></p> </td> <td width=189 valign=top style='width:142.05pt;border-top:none;border-left: none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt'> <p class=p0><span lang=EN-US style='font-size:10.5pt'>&nbsp;</span></p> </td> </tr> </table> <p class=p0><span lang=EN-US style='font-size:10.5pt;font-family:媅SO'>&nbsp;</span></p> <p class=p0><span style='font-size:10.5pt;font-family:媅SO'>擭0觺簨</span></p> <p class=p0 style='text-indent:21.0pt'><span lang=EN-US style='font-size:10.5pt'>&nbsp;</span></p> <p class=p0><span style='font-size:10.5pt;font-family:媅SO'>mQ0顣槝孴▼簨</span></p> <p class=p0 align=right style='margin-left:147.0pt;text-align:right;text-indent: 21.0pt;text-autospace:ideograph-other'><span lang=EN-US style='font-size:10.5pt'>&nbsp;</span></p> </div> </body> </html>

篇七 :实验一 分析天平称量练习及标准溶液配制

实验一 分析天平称量练习及标准溶液的配制

一、实验目的与要求

1. 了解电子天平的构造及使用规则,学会正确使用分析天平。

2. 掌握直接称量法和减量称量法的操作方法,学会称量瓶与干燥器的使用。

3. 注意有效数字的正确使用,培养准确、整齐、简明记录实验原始数据的习惯。

二、实验原理
    分析天平是根据杠杆原理设计而成的,每一项定量分析工作都直接或间接地需要使用分析天平,常用的分析天平有阻尼天平、半自动电光天平、全自动电光天平、单盘电光天平、微量天平和电子天平等。

电子天平根据电磁力平衡原理直接称量。其特点是性能稳定、操作简便、称量速度快、灵敏度高。能进行自动校正、去皮及质量电信号输出。
电子天平的使用方法:水平调节水泡应位于水平仪中心。
    ⑴ 接通电源,预热 30 分钟。

⑵ 打开关 ON ,使显示器亮,并显示称量模式 0.0000g。

⑶ 称量 按 TAR 键 ,显示为零后。 将称量样品放入盘中央,待读数稳定后,该数字即为称物体的质量。

⑷ 去皮称量 按 TAR 键清零,将空容器放在盘中央,按TAR键显示零,即去皮。将称量样品放入空容器中,待读数稳定后,此时天平所示读数即为所称样品的质量。

…… …… 余下全文

篇八 :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?

…… …… 余下全文