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玻璃仪器洗涤和干燥
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发表于
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管尖头、
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4年10个月前
回复于
极客DIY
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滴定
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虎哥
17年11个月前
回复于
化学
内容:2、查漏赶气再调零:意思是说
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前应首先检查
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管是否漏液,然后检查
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管下端是否有气泡,若有应赶掉它,最后调节液面至\"0\"位[联想:(1)查漏的方法是在洗净的
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管中加少量标准溶液。,若漏液,对于酸式
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管应在活塞上涂适量的凡士林,对于碱式
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管应更换一下玻璃球;(2)必须赶掉气泡,是因为如果
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管尖嘴部分有气泡没有赶掉,
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后气泡消失,则使测定结果偏高;(3)每次
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最好都从零位开始,4、左手控制右手动:意思是说在
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时,必须左手控制
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管,右手持锥形瓶不断摇动。,7、酚酞示剂常相识,强酸弱碱甲基橙:这句的意思是说中和
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常用酚酞做指示剂,只有强酸
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弱碱(如盐酸
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氨水)时,才能用甲基橙。,8、使用酸式
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管,不盛碱液切记清:这句的意思是说不能用酸式
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管盛放碱溶液(因为碱液和玻璃中的SiO2反应生成Na2SiO3而使活塞和
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管粘在一起)。
【实验】从零开始制备烟硝
Antonio
1年7个月前
发表于
化学
动手实践: 实验报导
内容:实验药品:浓硫酸(这里为了方便直接使用了含浓硫酸的清洁剂,
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出来的结果是92%,其中包含但不限于染色剂的杂质,也可以使用稀硫酸按前文方法得70%硫酸后蒸馏,但不宜使用稀硫酸直接蒸馏)【警告】实验产生的酸雾对人体有极大伤害
两份原创模拟试题
Aromatisation
1年11个月前
发表于
化学
严肃内容: 预印本
内容:酸碱
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是重要的容量分析方法。,用少量蒸馏水冲洗表面皿内表面,加水至50mL,用Na2S2O3溶液
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。,溶液呈淡黄绿色时停止
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,加入1mL淀粉溶液,振荡显色,逐滴加入Na2S2O3溶液并不断振荡,溶液浅绿色保持30s即停止
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,读取
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管读数。,继续
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至终点,终点时的操作和现象为____________(2分)。,接下来,用Na2S2O3
滴定
,写出离子方程式:____________(1分)。
磷酸法制备盐酸
Stewart
4年10个月前
发表于
化学
内容:经简易NaOH溶液
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实验测得粗略浓度4.9%(质量分数)左右(计算过程中稀盐酸密度按1g/ml近似处理)。
碘酸钙的制备
轻疯科研中心
13年4个月前
发表于
化学
内容:实验日期:2011年9月28日 实验地点:沈阳市第五十一中学 室温:25 ℃ [size=3][font=宋体]【实验目的】 1.以碘酸钙的制备为例,了解物质制备的过程 2.掌握过滤、蒸发、洗涤、移液与
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等实验操作
[分享]常用溶液的配制
jcy669
17年4个月前
发表于
化学
内容:硫代硫酸钠试液 可取用硫代硫酸钠
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液(0.1mol/L)。,碘试液 可取用碘
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液(0.1mol/L)。,硝酸银试液 可取用硝酸银
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液(0.1mol/L)。,乙醇制氢氧化钾试液 可取用乙醇制氢氧化钾
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液(0.5mol/L)。,碘试液 可取用碘
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液(0.1mol/L)。
从草木灰中提取“木灰碱”,我真的做到了
达闻西
11年2个月前
发表于
化学
内容:目前网上找到一些实验仅仅是提取出溶液,然后
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证明其中有碳酸根离子和钾离子罢了。
电弧法制硝酸
冥火
6年4个月前
发表于
化学
内容:(此法误差非常大,仅供参考)准确的浓度与产率待
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装置购置后将重新实验测量。
网上化学数据库
mosiluo
15年8个月前
发表于
化学
内容:chemdata/ XXXXXXXXXXXXXXXXXXXXXXXXXX/Data%20/XXXXXXXml http://155.135.31.26/oliver/XXXXXXXXXXXm 7. pH 值和
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曲线
三聚氰胺的化学性质溶解度及检测方法
AnthraX
16年4个月前
发表于
化学
内容:目前三聚氰胺的检测方法分为浊度法(GB9567-1997, 目测或浊度计,尚杰峰等,2005,化工标准计量质量2005-01)、升华法、重量法(GB9567-1988)、0.5 mol/L硫酸电位
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法
火箭版研究课题综述与推荐(不断更新中)
拔刀斋
13年3个月前
发表于
喷气推进
内容:液体推进剂的化验——目前主要是过氧化氢浓度测量,包括化学
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、密度法、PH法等。
连载:部分实验仪器的使用方法(请大家多多补充)
落叶兄
10年5个月前
回复于
化学
内容:②也可用做较大量的物质间的反应 (3)烧瓶----有圆底烧瓶,平底烧瓶 ①常用做较大量的液体间的反应②也可用做装置气体发生器 (4)锥形瓶 常用于①加热液体,②也可用于装置气体发生器和洗瓶器③也可用于
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中的受滴容器
[转帖]一个化工男自大学至今12年化学之路遭遇的安全事故
msckmsck
11年3个月前
发表于
化学
内容:我们班的一个2货配置重氮液(分析试验
滴定
用,那2货配置全班用的50升),然后不知道肿么回事,瓶子炸了。
双螺旋——发现DNA结构的故事
1211
19年1个月前
回复于
科学技术学
内容:Gulland)和乔丹(XXXXXXrdan)关于DNA酸碱
滴定
的文章,使我非常信服他们那有力的结论:即如果不是全部,至少大部分碱基能够形成与其他碱基相连的氢键。
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