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约找到 199 条结果,耗时 0.24 秒
Re:打算 购买 些 酸碱指示剂 请推荐
blueness
16年1个月前
回复于
化学
内容:小声问一下,甲基橙的变色范围是:ph<3.1时显红色:3.1<ph<4.4时是橙色:ph>4.4时是黄色如果这样酸碱
滴定
没有完全中和呀?</ph<4.4时是橙色:ph>
2氧化硫,2硫化碳,氯气它们分别怎么制?
swifttt
14年5个月前
回复于
化学
内容:回三楼 ··自己 用KMnO4 与HCl 实际制的时候发现超剧烈 ··只能用
滴定
管代替分液漏斗 - -最好用二氧化锰+浓盐酸 ··工业电解食盐水··
热解PAC(聚合氯化铝 )法制备盐酸
Stewart
5年10个月前
回复于
化学
内容:首先,产品182ml,10ml用于
滴定
,HCl质量分数约7.5%额,搅拌子原配的比这个大,胶囊状。
请问如何分离成品试剂
古明地觉
9年11个月前
回复于
化学
内容:不曾存在:高中没交
滴定
?
我也玩玩电解
兰若,公主魂
10年10个月前
回复于
化学
内容:不错啊[s:12],还是学校爽,什么都可以拿得用,特别是那些离心机,抽气过滤机,水浴机,
滴定
管,酒精喷灯[s:12]。。。
请问有什么简单的(非食用)的方法来鉴别硫酸镁的真伪??
trample
15年7个月前
回复于
化学
内容:如果要分析纯度的话...实验方法:
滴定
...缺点:不会太准确的...对于分析纯还是化学纯..没辙物理方法:光谱分析...缺点:虽然准确,但一般人没有光谱仪...对于这些东东划不来
我打算合成一种化合物——左乙拉西坦
smith
9年10个月前
回复于
化学
内容:实验器材方面,蒸馏的环境到货了,定量分析的环境也到货了,可以酸式
滴定
了。,我居然忘了买
滴定
夹,用烧瓶夹先代替吧,三口烧瓶、磁力搅拌,现在还用不着,先不买 体系内资源:找了亲戚,他给我介绍了个有机学院的老师,我给他打电话,他以为我是要去读他的研究生,汗。。。。
减压蒸馏70%硝酸,能不能获得超过90%浓度的硝酸?
微微
10年11个月前
回复于
化学
内容:用
滴定
管测量了一下我做的,好像浓度没有什么变化。
请问有什么简单的(非食用)的方法来鉴别硫酸镁的真伪??
hambaby
15年7个月前
回复于
化学
内容:定量
滴定
分析,在有未知的金属阳离子杂质存在的情况下,必须使用盐酸羟胺、KCN作为掩蔽剂,防止非Ca、Mg阳离子对于分析结果的影响。
KK鲨鱼浓度的测定
gjgh
3个月4天前
回复于
化学
内容:2.据传KK鲨鱼中含有比例未知的磷酸,可能会干扰
滴定
。
求教:如何制作发射架
52DIY
9年1个月前
回复于
喷气推进
内容:引用 大梦航空:快去买
滴定
台 我们怀疑你涉嫌参与一起盗墓案件,请跟我们回去接受调查.
求过氧化氢浓度测定法
ltc
13年3个月前
回复于
化学
内容:我觉得还是分解好弄水蒸气造成的影响可以用干燥剂解决
滴定
的话似乎高锰酸钾还原产物锰离子能催化双氧水分解,估计对精度影响不小
醋酸钴(III)的电解制备 - 结题报告
虎哥
3年7个月前
回复于
化学
内容:电解中记录电流曲线,电解后在电解液中刷洗电极,使产物均匀溶解于电解液,设法测定三价钴的含量(硫代硫酸钠
滴定
),计算电荷效率,可获得定量数据。
彻底无语的NaB(C6H5)4...
carneades
15年8个月前
回复于
化学
内容:引用第6楼小苍鹰于2009-06-06 18:07发表的 :想当年我花了20元买了5g邻二氮菲放到现在动一下都没这东西我好歹拿来用作高铈离子
滴定
亚铁离子的指示剂。
【实验】制备高氯酸钾
轻疯科研中心
14年6个月前
回复于
化学
内容:配制K2SO4溶液(不小心把硫酸钾加多了,结果导致后面一系列尴尬) 2)配制HClO4溶液(不小心洒到木质地板上几滴,赶紧用1mol/L NaOH(aq)处理) 3)开始进行
滴定
操作,4)开始收拾残局,进行整理 最后将暂时不需要的(量筒、容量瓶、硫酸钾……)都收拾走了,铁架台当
滴定
台用继续过滤着。
求助 磨口仪器被粘住
盐卜
7年8个月前
回复于
化学
内容:暴力拧这也不靠谱,我至少拧断两根
滴定
管,现在我都不敢去用力拧。
怎么检测油条中是否含有明矾?
北落师门
9年8个月前
回复于
化学
内容:要精确的定量分析的话,国标给出的办法是用定量的EDTA与铝形成络合物,然后用硝酸铅
滴定
剩余EDTA来测出消耗量,详情请看gb1895-2004的国标
求助~硝酸镁浓缩硝酸
盐卜
11年1个月前
回复于
化学
内容:我一个月前用硝镁法蒸馏硝酸,拿到学校求老师
滴定
一下,磨叽了两周都没结果。
南科除垢剂或许能成为爱好者的硝酸来源
悟死参玄
1年11个月前
回复于
化学
内容:最后
滴定
发现浓度只有七十几。
【视频】昨日发射成功
3ha510
15年9个月前
回复于
喷气推进
内容:不错嘛,发射架建议用那种
滴定
台架,棒子很硬,绝对直!
[实验][扫灰]EDTA测定自来水总硬度
百死不悔
13年10个月前
回复于
化学
内容:二、器材药品: 10ml酸式
滴定
管一个 铬黑T指示剂 EDTA标准溶液 亚铁氰化钾(掩蔽剂,掩蔽Cu2+和Fe3+)注:本人无法找到三乙醇胺、氰化物等,故以之代替略去吸量管、洗耳球、蒸馏水、烧杯等常用器材
[求助]救命呀!我蒸馏的硝酸呢?
yoman
17年7个月前
回复于
化学
内容:25ml
滴定
管(只有管) 都要50塊 吸的球....更貴所以器材嚴重缺乏沒法子,國內制的都買不到,有的都只有250ml以下燒杯(都要15塊)外國制的都是天價,什麼英國德國法國....八國聯軍都快要出來
吹箭制作手册
rudolf
13年2个月前
回复于
机械与工具
内容:我是学化学的,在学校也没有PVC管、无缝钢管之类的材料,所以首先选择的是
滴定
管。,不过也许换粗管子会好一点吧,我没试过粗管子,
滴定
管内径好像是11mm来着。
求过氧化氢浓度测定法
zhaokenb
13年3个月前
回复于
化学
内容:方案一:使用甘汞电极测定电动势,再根据Nernst方程计算浓度值(电化学本人学的不咋地,全当只是个提议.....)方案二:稀释过氧化氢后用高锰酸钾进行
滴定
,具体方法详见XXXXXXXXXXXXXXXXXXXX
求教如何用滴定法检验银的纯度!
化学小僧
10年1个月前
回复于
化学
内容:NO WAY
滴定
法一般鉴定的都是少量的物质,大量的话可能会累积导致误差太大。
[实验过程]测定氯酸钾质量分数[科创基金项目]
UICalc
4年8个月前
回复于
化学
内容:solution with 0.1 N sodium thiosulfate (NTS) Record the number as A (A = mL titrant /mL sample)在pH<0.1下
滴定
,碘量瓶)中加入10毫升样品溶液(预先配好,将),密塞,避光反应10分钟 打开塞子,加入1g碘化钾,大力摇晃5秒 迅速加入25毫升饱和磷酸钠溶液,搅拌 使用0.1mol/L硫代硫酸钠溶液
滴定
【实验】浓硫酸的提取
百死不悔
14年3个月前
回复于
化学
内容:引用第1楼虎哥于2010-10-30 23:38发表的 :
滴定
没有,最后浓度达到多少?
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