做的化學(xué)實(shí)驗(yàn)?？?/title> <meta name="keywords" content="實(shí)驗(yàn)?？?化學(xué)實(shí)驗(yàn),化學(xué)實(shí)驗(yàn)?？?" /> <meta name="description" content="化學(xué)是自然科學(xué)的一種，主要在分子、原子層面，研究物質(zhì)的組成、性質(zhì)、結(jié)構(gòu)與變化規(guī)律，創(chuàng)造新物質(zhì)，實(shí)質(zhì)是自然界中原來(lái)不存在的分子，下面給大家分享一些關(guān)于做的化學(xué)實(shí)驗(yàn)?？碱}型，希望對(duì)大家有所幫助。一、配制一定物質(zhì)的量濃度的溶液以配制100mL1.00mol/L的NaOH溶液為例：1、步驟：(1)計(jì)算(2)稱量： 4.0g (保留一位小數(shù))(3)溶解(4)轉(zhuǎn)移：待燒杯中溶液冷卻至室溫后轉(zhuǎn)移(5)洗滌(6)定容：將蒸餾水注入容量瓶，當(dāng)液面離刻度線1— 2cm 時(shí)，改用膠頭滴管滴加蒸餾水至凹液面最低點(diǎn)與刻度"/> <meta http-equiv="Cache-Control" content="no-transform" /> <meta http-equiv="Cache-Control" content="no-siteapp" /> <script src="http://www.rzpgrj.com/public/js/head.js"></script> <link href="/public/css/article.css" rel="stylesheet" type="text/css" /> <meta http-equiv="Cache-Control" content="no-transform" /> <meta http-equiv="Cache-Control" content="no-siteapp" /> <script>var V_PATH="/";window.onerror=function(){ return true; };</script> </head> 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id="contentText"> <p style="text-indent: 2em; text-align: left;">化學(xué)是自然科學(xué)的一種，主要在分子、原子層面，研究物質(zhì)的組成、性質(zhì)、結(jié)構(gòu)與變化規(guī)律，創(chuàng)造新物質(zhì)，實(shí)質(zhì)是自然界中原來(lái)不存在的分子，下面給大家分享一些關(guān)于做的化學(xué)實(shí)驗(yàn)?？碱}型，希望對(duì)大家有所幫助。</p><p style="text-indent: 2em; text-align: left;"><strong>一、配制一定物質(zhì)的量濃度的溶液</strong></p><p style="text-indent: 2em; text-align: left;">以配制100mL1.00mol/L的NaOH溶液為例：</p><p style="text-indent: 2em; text-align: left;">1、步驟：(1)計(jì)算(2)稱量：　4.0g　(保留一位小數(shù))(3)溶解(4)轉(zhuǎn)移：待燒杯中溶液冷卻至室溫后轉(zhuǎn)移(5)洗滌(6)定容：將蒸餾水注入容量瓶，當(dāng)液面離刻度線1—　2cm　時(shí)，改用膠頭滴管滴加蒸餾水至凹液面最低點(diǎn)與刻度線在同一水平線上(7)搖勻：蓋好瓶塞，上下顛倒、搖勻(8)裝瓶貼標(biāo)簽：標(biāo)簽上注明藥品的名稱、濃度。</p><p style="text-indent: 2em; text-align: left;">2、所用儀器：(由步驟寫(xiě)儀器)托盤(pán)天平、藥匙、燒杯、玻璃棒、(量筒)、100mL容量瓶、膠頭滴管</p><p style="text-indent: 2em; text-align: left;">3、注意事項(xiàng)：</p><p style="text-indent: 2em; text-align: left;">(1) 容量瓶：只有一個(gè)刻度線且標(biāo)有使用溫度和量程規(guī)格，只能配制瓶上規(guī)定容積的溶液。(另外使用溫度和量程規(guī)格還有滴定管、量筒)</p><p style="text-indent: 2em; text-align: left;">(2) 常見(jiàn)的容量瓶：50 mL、100mL、250mL、500mL、1000mL。若配制480mL與240mL溶液，應(yīng)分別用500mL容量瓶和250mL容量瓶。寫(xiě)所用儀器時(shí)，容量瓶必須注明規(guī)格，托盤(pán)天平不能寫(xiě)成托盤(pán)天秤!</p><p style="text-indent: 2em; text-align: left;">(3) 容量瓶使用之前必須查漏。<a href='http://www.rzpgrj.com/way/' target='_blank'><u>方法</u></a>：向容量瓶?jī)?nèi)加少量水，塞好瓶塞，用食指頂住瓶塞，用另一只手的五指托住瓶底，把瓶倒立過(guò)來(lái)，如不漏水，正立，把瓶塞旋轉(zhuǎn)1800后塞緊，再倒立若不漏水，方可使用。(分液漏斗與滴定管使用前也要查漏)</p><p style="text-indent: 2em; text-align: left;">(4)命題角度：一計(jì)算所需的固體和液體的量，二是儀器的缺失與選擇，三是實(shí)驗(yàn)誤差分析。</p><p style="text-indent: 2em; text-align: left;"><strong>二、Fe(OH)3膠體的制備</strong></p><p style="text-indent: 2em; text-align: left;">1、步驟：向沸水中加入FeCl3的飽和溶液，繼續(xù)煮沸至溶液呈紅褐色，停止加熱。</p><p style="text-indent: 2em; text-align: left;">操作要點(diǎn)：四步曲：①先煮沸，②加入飽和的FeCl3溶液，③再煮沸至紅褐色，④停止加熱</p><p style="text-indent: 2em; text-align: left;">2、涉及的化學(xué)方程式：Fe3++3H2O Fe(OH)3(膠體)+3H+　強(qiáng)調(diào)之一是用等號(hào)，強(qiáng)調(diào)之二是標(biāo)明膠體而不是沉淀，強(qiáng)調(diào)之三是加熱。</p><p style="text-indent: 2em; text-align: left;">3、命題角度：配制步驟及對(duì)應(yīng)離子方程式的書(shū)寫(xiě)</p><p style="text-indent: 2em; text-align: left;"><strong>三、焰色反應(yīng)</strong></p><p style="text-indent: 2em; text-align: left;">1、步驟：洗—燒—蘸—燒—洗—燒</p><p style="text-indent: 2em; text-align: left;">2 、該實(shí)驗(yàn)用鉑絲或鐵絲</p><p style="text-indent: 2em; text-align: left;">3 、焰色反應(yīng)可以是單質(zhì)，也可以是化合物，是物理性質(zhì)</p><p style="text-indent: 2em; text-align: left;">4 、Na ，K 的焰色：黃色，紫色(透過(guò)藍(lán)色的鈷玻璃)</p><p style="text-indent: 2em; text-align: left;">5 、某物質(zhì)作焰色反應(yīng)，有黃色火焰一定有Na ，可能有K</p><p style="text-indent: 2em; text-align: left;">6、命題角度：實(shí)驗(yàn)操作步驟及Na ，K 的焰色</p><p style="text-indent: 2em; text-align: left;"><strong>四、Fe(OH)2的制備</strong></p><p style="text-indent: 2em; text-align: left;">1、實(shí)驗(yàn)現(xiàn)象：白色沉淀立即轉(zhuǎn)化灰綠色，最后變成紅褐色沉淀。</p><p style="text-indent: 2em; text-align: left;">2、化學(xué)方程式為：Fe2++2OH-=Fe(OH)2 4Fe(OH)2+O2+2H2O=4Fe(OH)3</p><p style="text-indent: 2em; text-align: left;">3、注意事項(xiàng)：(1)所用亞鐵鹽溶液必須是新制的，NaOH溶液必須煮沸，(2)滴定管須插入液以下，(2)往往在液面加一層油膜，如苯或食物油等(以防止氧氣的氧化)。</p><p style="text-indent: 2em; text-align: left;">4、命題角度：制備過(guò)程中的現(xiàn)象、方程式書(shū)寫(xiě)及有關(guān)采取<a href='http://www.rzpgrj.com/fwn/cuoshi/' target='_blank'><u>措施</u></a>的原因</p><p style="text-indent: 2em; text-align: left;"><strong>五、硅酸的制備</strong></p><p style="text-indent: 2em; text-align: left;">1、步驟：在試管中加入3—5mL飽和Na2SiO3溶液，滴入1—2滴酚酞溶液，再用膠頭滴管逐滴加入稀鹽酸，邊加邊振蕩，至溶液顏色變淺并接近消失時(shí)停止。</p><p style="text-indent: 2em; text-align: left;">2、現(xiàn)象：有透明的硅酸凝膠形成</p><p style="text-indent: 2em; text-align: left;">3、化學(xué)方程式：NaSiO3+2HCl= H2SiO3↓+2NaCl(強(qiáng)酸制弱酸)</p><p style="text-indent: 2em; text-align: left;">4、NaSiO3溶液由于SiO32-水解而顯堿性，從而使酚酞試液呈紅色。</p><p style="text-indent: 2em; text-align: left;"><strong>六、離子的檢驗(yàn)</strong></p><p style="text-indent: 2em; text-align: left;">1、Cl-的檢驗(yàn)：加入AgNO3溶液，再加入稀硝酸，若生成不溶于稀HNO3的白色沉淀;或先加硝酸化溶液(排除CO32-干擾)，再滴加AgNO3溶液，如有白色沉淀生成，則說(shuō)明有Cl-存在</p><p style="text-indent: 2em; text-align: left;">2、SO42-的檢驗(yàn)：先加入鹽酸，若有白色沉淀，先進(jìn)行過(guò)濾，在濾液中再加入BaCl2溶液，生成白色沉淀即可證明。若無(wú)沉淀，則在溶液中直接滴入BaCl2溶液進(jìn)行檢驗(yàn)。</p><p style="text-indent: 2em; text-align: left;">3、命題角度：檢驗(yàn)方法、除雜、沉淀洗滌及相關(guān)純度的計(jì)算</p><p style="text-indent: 2em; text-align: left;"><strong>七、氨氣的實(shí)驗(yàn)室制法</strong></p><p style="text-indent: 2em; text-align: left;">1、反應(yīng)原理：2NH4Cl+Ca(OH)2CaCl2+2NH3↑+2H2O</p><p style="text-indent: 2em; text-align: left;">2、收集：向下排空氣法(管口塞一團(tuán)棉花，避免空氣對(duì)流)</p><p style="text-indent: 2em; text-align: left;">3、驗(yàn)滿：①將濕潤(rùn)的紅色石蕊試紙放在試管口，若試紙變藍(lán)，說(shuō)明氨氣已收集滿 ②將蘸有濃鹽酸的玻璃棒靠近試管口，出現(xiàn)大量白煙，則證明氨氣已收集滿</p><p style="text-indent: 2em; text-align: left;">4、干燥方法：堿石灰干燥(不能無(wú)水氯化鈣)</p><p style="text-indent: 2em; text-align: left;">5、裝置圖：固體和固體加熱制氣體的裝置，與制氧氣的相同</p><p style="text-indent: 2em; text-align: left;">拓展：濃氨水或濃銨溶液滴到生石灰或燒堿中制氨氣，或濃氨水直接加熱也可制氨氣</p><p style="text-indent: 2em; text-align: left;">6、命題角度：因氨氣作為中學(xué)化學(xué)實(shí)驗(yàn)制取氣體中唯一的實(shí)驗(yàn)，其地位不可估量。主要角度為：反應(yīng)原理、收集、干燥及驗(yàn)滿等，并以此基礎(chǔ)進(jìn)行性質(zhì)探究實(shí)驗(yàn)。</p><p style="text-indent: 2em; text-align: left;">做的化學(xué)實(shí)驗(yàn)?？枷嚓P(guān)<a href='http://www.rzpgrj.com/yu/wenzhang/' target='_blank'><u>文章</u></a>：</p><p style="text-indent: 2em; text-align: left;">★ <a href="http://www.rzpgrj.com/xuexiff/huahuaxue/c37436.html" target="_blank">做化學(xué)實(shí)驗(yàn)的總結(jié)大全</a></p><p style="text-indent: 2em; text-align: left;">★ <a target="_blank">2017高考化學(xué)實(shí)驗(yàn)經(jīng)典八大題</a></p><p style="text-indent: 2em; text-align: left;">★ <a href="http://www.rzpgrj.com/xuexiff/chusanhuaxue/c73838.html" target="_blank">初三化學(xué)典型實(shí)驗(yàn)總結(jié)與10大易錯(cuò)點(diǎn)舉例分析</a></p><p style="text-indent: 2em; text-align: left;">★ <a target="_blank">高考化學(xué)實(shí)驗(yàn)重要知識(shí)總結(jié)</a></p><p style="text-indent: 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