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约找到 200 条结果,耗时 0.211 秒
回 6楼(zhaokenb) 的帖子
全变
13年1个月前
回复于
化学
内容:谢谢你详细的解释,之前没想到 k不稳 那么小,但其实我的方法不是用
滴定
管直接加超稀溶液。,我是在烧杯里放蒸馏水和镀件,然后在分液漏斗或
滴定
管中加入较吸的硝酸银溶液,通过滴速控制烧杯中溶液的浓度。
[实验新编]乌洛托品被氧化
sodss
13年4个月前
回复于
化学
内容:二价锰有催化高锰酸根被还原的性质,这与高锰酸钾法
滴定
分析时要“开始慢”的道理一样。,硫酸解乌洛托品是工业分析乌洛托品的一个重要步骤,酸解并挥发完全甲醛后,用碱反
滴定
剩余的硫酸以确定乌洛托品的量
【实验】浓硫酸的提取
托尼史塔克
14年3个月前
回复于
化学
内容:如果再加上
滴定
就是完美。
整点硝酸,为二氧化锰电极做准备
Halloween
4年7个月前
回复于
化学
内容:下一期
滴定
镍离子,应该不涉及HX。
实验展示:硫酸铜中铜含量的测定
化学小僧
12年0个月前
发表于
化学
内容:产生的碘以硫代硫酸钠
滴定
,淀粉为指示剂。,平行
滴定
两组,计算硫代硫酸钠标准液浓度。 ,硫酸铜试样三份,置于三个锥形瓶中;(最好是碘量瓶) 2.加入10ML蒸馏水溶解,加入硫酸酸化,最后加入7ml碘化钾溶液;并立即用硫代硫酸钠标准溶液标定为淡黄色; 3.加入1ml淀粉溶液,溶液变为蓝色,继续
滴定
使蓝色褪去,4.加入KSCN溶液,由于碘被释放,蓝色加深,继续
滴定
至蓝色恰好消失,最后溶液呈米色(CuSCN悬浊液),期间的颜色变化比较复杂,所以多拍了几张 5.最后发一张所有
滴定
的结果照片,,顺便吐槽一下:有许多的人做实验就是打酱油,没有仔细的去做,实验失败了也不去思考,只是去抄袭别人的数据,这样其实在侮辱这门学科,这个实验只要求
滴定
两瓶,但是由于我第一次多加了一些就果断重新做,有一组实验数据偏差的太大
分析纯水的检验
yuanlegang
19年4个月前
回复于
化学
内容:
滴定
分析的时候也不过2~3滴啊。
出一个铁架台
紫色的碘
12年8个月前
回复于
跳蚤市场
内容:回二楼:不是的,我有一个大理石的
滴定
台,这个铁架台不想要了,占地方。
氧化亚铁(FeO)的制备
UIC
5年4个月前
回复于
化学
内容:kindle浏览器发的至于定量方法,把产物完全氧化计算差量,或者
滴定
三氯化钇的制备
paclab
14年0个月前
回复于
化学
内容:下次最好用
滴定
法测一下制出来成品的纯度哟这个实验未知量太大了。。
液溴制取方法、实践经验报告
2SC1970
1年0个月前
回复于
化学
内容:这个好像是
滴定
管的手法,因为过量一滴就不合格。
kasim最后一批货物甩卖
lizhihong
14年7个月前
回复于
跳蚤市场
内容:是否还有
滴定
管?
关于镀银的问题
全变
13年2个月前
发表于
化学
内容:比如用
滴定
管缓慢地滴加硝酸银溶液到放有镀件和水的烧杯里
【原创】高效氧化剂 --- 高氯酸钾的制备。
mithril
15年5个月前
回复于
化学
内容:前面提及过
滴定
管...
废弃化学实验室寻宝
中和为氟
4年9个月前
回复于
化学
内容:嗯,tb搜水培钾倒是有99纯度的硝酸钾,搜水培钙也是,纯度均在99左右(用碳酸钠
滴定
)
标准液的几个问题
yy+sy
15年10个月前
回复于
化学
内容:我试过,如果用我那个老古董的天平,
滴定
会很不准确。。。
80名近代化学著名人物头像集(翻拍版)
sam_jin3887
16年0个月前
回复于
化学
内容:银量法不是法扬斯发明的,但是有专门的法扬斯法,同样是测定氯离子的,但是是沉淀
滴定
法
【实验】蒸馏法制取发烟硝酸
mithril
15年11个月前
回复于
化学
内容:从颜色上看可以肯定是达到烟硝的浓度,我建议LZ做一下
滴定
测浓度,个人感觉其浓度低于95%。
中学生在学校搞事情之——蒸馏硝酸
NClittleprince
6年8个月前
回复于
化学
内容:蒸馏硝酸硫酸貌似要大大过量的~简易楼主用密度计或者
滴定
的方法测一下浓度。
对碳酸根离子对二价铜离子的络合的验证实验
smith
9年9个月前
回复于
化学
内容:继续发
滴定
耗了43ml的碳酸钠溶液,终点没有拍好,我记的数
lizhihong货物
thallium2012
14年7个月前
发表于
跳蚤市场
内容:电位器给你5个 随机的 不收钱 就当找零吧铁架台两个 你好好说明白是哪两个8块的砝码 小容量瓶一个 比色皿4个酸式
滴定
管5元这样的话就是20+8+1+4+5=38晕死 快递费比38还多 我只能给你物流了
减压蒸馏70%硝酸,能不能获得超过90%浓度的硝酸?
ltc
11年1个月前
回复于
化学
内容:硝硫混酸,减压蒸馏可以到95以上,酸碱
滴定
测的浓度 很容易废掉抽气的管子,我报废了两根硅胶管
KK鲨鱼浓度的测定
粥粥
2个月29天前
回复于
化学
内容:非常神奇,我用百分城称和
滴定
管称量10mlKK鲨鱼的密度,为1.800±0.002g/ml,25°C下浓度为89%,复现了上面几楼的结果
连载:部分实验仪器的使用方法(请大家多多补充)
虎哥
17年0个月前
回复于
化学
内容:2.
滴定
台
滴定
台专用于固定
滴定
管作容量分析实验用,
滴定
台均附
滴定
管夹(又称蝴蝶夹),
滴定
台面料为耐腐蚀的白色面料,已有不同型号的定型产品。,使用注意事项 (1)
滴定
管夹持在
滴定
夹上时,务必保持
滴定
管垂直于
滴定
台。,(2)若无
滴定
台时,则可在铁架台上配
滴定
夹或固定2个烧瓶夹代用,
滴定
时,锥形瓶下最好衬上白纸。
【实验】浓硫酸的提取
虎哥
14年3个月前
回复于
化学
内容:
滴定
没有,最后浓度达到多少?
【实验】浓硫酸的提取
焓熵`
14年3个月前
回复于
化学
内容:强烈要求楼主
滴定
后下结论!
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:pH=4.4与pH=7仅差一滴酸(或碱),所以
滴定
时pH=4.4时近似为7!!!
好吧,重发,制备银纳米及其CHI电化学表征
ljp
13年10个月前
回复于
化学
内容:实验数据:硼氢化钠10mmol每l,取25ml,硝酸银1mmol每l,因为要
滴定
所以多取些,15ml,实际反映只要7到8ml。
彻底无语的NaB(C6H5)4...
小苍鹰
15年8个月前
回复于
化学
内容:引用第13楼carneades于2009-06-07 20:21发表的 :这东西我好歹拿来用作高铈离子
滴定
亚铁离子的指示剂。
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