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一个超级BT的 初三的竞赛题 高手解答a~
ltc
13年7个月前
回复于
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内容:我估计是氢氧化
钠
的浓度很大时,会很快生成碳酸
钠
,而碳酸
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的溶解度比氢氧化
钠
小得多,所以在溶液中可能会形成一层晶膜从而阻碍了二氧化碳与氢氧化
钠
的接触,从尔是反应速率会减小。
制备高氯酸铯
肖特基的救赎
2年2个月前
回复于空间文章
制备高氯酸铯
内容:体系里有
钠
离子能不黄吗
饱和食盐水的电解产物是?
消失
16年4个月前
发表于
化学
内容:是氢氧化
钠
氯气和氢气 还是氯酸
钠
和氢气啊
【参赛】“雷神之心”———氯化钠晶体
LED
4年3个月前
回复于
晶体养成所
内容:不知为何工业中不是直接电解氯化钾生成氯酸钾,而是要先生成氯酸
钠
再复分解呢?,这样电解的产物,高氯酸
钠
的含量如何。
煮了一锅硫磺,做臭碱
smith
9年8个月前
发表于
化学
内容:资料上查到硫化
钠
也会燃烧,而且有文献说低价硫化合物与氯酸钾的混合物有作为针刺药的潜力,顺便也想探究一下硫磺与碳酸
钠
的机理,于是今天把硫磺加到碳酸
钠
溶液里面去煮,看看能不能搞出一些硫化
钠
出来(我还不想直接买试剂,) 我先把升华硫捏成粉,然后加到碳酸
钠
的饱和溶液里面,在加热煮,但整个反应过程很慢,开始溶液是无色的,硫磺飘在溶液上面,但煮着煮着硫磺就开始沉下去了,然后溶液变成类似PA的颜色,而且有刺激性气味放出
关于炮姐转职生产硝酸钾这档事(完)
7749
3年9个月前
回复于
化工矿冶
内容:又没多少10袋而乙,亚
钠
总有用完的一天,
迭氮化铯制备(持续更新)
零产率人
1年10个月前
发表于
化学
内容:本来打算用叠氮化
钠
和硫酸制备叠氮酸然后中合的,但是考虑到叠氮酸易爆,沸点低,剧毒所以将制备方法改为制备叠氮化
钠
一样的方法XXXXXXXXXXXXXXXXXXXXXXXX/t/88594此为购买的氢氧化铯制备过程为硫酸联氨,20g,和15ml无水乙醇混合,混合后加入氢氧化
钠
6g 沸腾回流10分钟后,蒸馏出来得到水合肼的乙醇溶液加入氢氧化
钠
二次蒸馏(除水)然后将氢氧化铯与制备的肼混合,滴加亚硝酸叔丁酯得到迭氮化铯,然后回流搅拌
核辐射计RADEYE PRD,RADEYE NL,PDS-100GN拆解参观
虎哥
9个月19天前
发表于
拆机鉴赏
核技术与核仪器
内容:它用的碘化
钠
这种还算快速的闪烁体,这么低实属不应该,同样用碘化
钠
的RADEYE系列,通过率就高于150kcps。,RADEYE PRD是γ探测器,它用了一小块碘化
钠
晶体和一个超级小的PMT。
简单试剂自制高锰酸盐
ChairmanC
6年6个月前
发表于
化学
内容:二氧化锰与次氯酸
钠
溶液(淘宝买的高浓84)共热,得到紫色高锰酸
钠
溶液,但是浓度好像有点低 等明矾到了之后可以制取高锰酸铝沉淀试了下硫酸铜不能和高锰酸
钠
反应生成沉淀,可能铜离子比较软的缘故
光纤光谱仪 vs 夜间橙色的天空 (USB4000 30s)
RodTech
7年9个月前
发表于
极客DIY
内容:每天晚上天空都是橙色的,而最近发现 天文使用的
钠
灯滤光片针对589nm的窄带截止,已经基本失效,怀疑橙色光 不是
钠
灯产生的下面的研究与谷歌调查发现,天文光污染滤片,是几十年前就定下来的标准,那时候,大规模使用低压
钠
灯,,只有很窄的个别尖峰,容易过滤,现在使用的是高压
钠
灯,谱线接近连续。,这对城市天文,是个坏消息,
钠
谱线截止滤镜,基本失效了。。。
想到一个制备S酸的思路,不知是否可行?
浪里黑条
6年7个月前
发表于
化学
内容:据查,在乙醇介质中,硫酸氢
钠
可以发生电离。,但是,硫酸
钠
不溶于乙醇,因此
钠
离子和一半的硫酸根离子会结合形成硫酸
钠
沉淀,可以被除去(当然,过滤不能用滤纸啦)。
在家做了块肥皂……
相对论万岁
11年6个月前
发表于
极客DIY
内容:(或30%氢氧化
钠
溶液),植物油,水,乙醇(95%或无水乙醇),氯化
钠
制作肥皂的原理:皂化反应脂肪和植物油的主要成分是甘油三酯,它们在碱性条件下水解的方程式为:CH2OOCR|CHOOCR + 3NaOH,简单的说,就是油脂在碱的条件下水解当碱是氢氧化
钠
的时候,生成物为高级脂肪酸
钠
和甘油(丙三醇)————————我是分割线——————————首先配置约4ml30%NaOH溶液(如果你有的话可以直接量取),表面会结上一层壳 冷却比较慢,这段时间不要浪费了,配置氯化
钠
饱和溶液,用于盐析高级脂肪酸
钠
(就是肥皂) 量取约25ml水 然后加入足量氯化
钠
,搅拌,记住,氯化
钠
溶液一定要饱和 努力搅拌,发现氯化
钠
加多了一点点,,溶不了了……没事,不管他 当你的氯化
钠
溶液配好了,甘油和高级脂肪酸
钠
的混合物也该冷却好了取出来,貌似凝固了…… 加入约250ml热的开水 再放入冷水进行冷水浴……多等等,逛会儿论坛,大约5min,后,取出烧杯,加入氯化
钠
饱和溶液,搅拌析出的高级脂肪酸
钠
(肥皂) 用纱布过滤,我这里没有纱布了……用的一种比较奇葩的纸,貌似是棉做的……得到成品,废液可以倒掉 将其捏成条状,晒干就是肥皂了……当然你也可以用模子
探究无钯情况下次磷酸钠作为还原剂制备鲁米诺的可行性
2SC1970
2年4个月前
回复于
化学
科创基金
内容:选择所述实验条件的原因:次磷酸
钠
虽然电极电势很负,但是其参与的还原反应一般都速率缓慢,因此只探究无催化剂的条件是不行的,必须考虑加入催化剂。,Ti、Ni、Cr、Mn、Cu:虽具有多种价态,但其中无还原性显著的价态,或由稳定价态生成还原性显著的价态比较困难V:价格高昂,不易买到Fe:与产物难以分离二价钴离子虽然本身还原性不强,但其可能催化次磷酸
钠
的氧化反应,关于反应条件的选择:与用次磷酸
钠
做还原剂的反应(例如化学镀)多在碱性条件下进行,也有中性条件的,几乎未见酸性的例子。
关于炮姐转职生产硝酸钾这档事(完)
新黑火药
1年11个月前
回复于
化工矿冶
内容:食品级的亚硝酸
钠
拼多多上就有
关于炮姐转职生产硝酸钾这档事(完)
7749
3年9个月前
回复于
化工矿冶
内容:你做过电解盐水制取高氯酸
钠
么?
叠氮化-启动!
净释十方
1个月27天前
发表于
化学
动手实践: 实验报导
内容:本实验在于探究叠氮化
钠
的合成提醒:水合肼剧毒,有挥发性,叠氮化
钠
剧毒,亚硝酸异丙酯有挥发性,请务必做好防护进行试验,洗消用高锰酸钾溶液实验试剂:85%水合肼,亚硝酸异丙酯,氢氧化
钠
,无水乙醇一 制备亚硝酸异丙酯所需试剂,:亚硝酸
钠
,异丙醇,磷酸称取75克亚硝酸
钠
用180ml水溶解另取烧杯,量筒,量取40ml磷酸,再加30ml水稀释再量取110ml异丙醇,与磷酸混合设置冰水浴,在搅拌的情况下缓慢向亚硝酸
钠
溶液中加入磷酸与异丙醇的混合溶液,,全部加完后让其再反应15分钟,静置,分液观察到生成黄色油状物质,溶液分层用梨形分液漏斗分液,取上层液体,加入碳酸
钠
溶液,洗涤,分液,再加入无水硫酸
钠
,除水,过滤,得到约75ml亚硝酸异丙酯二 搭建如图装置向其中加入
制备高氯酸铵
零产率人
1年11个月前
回复于空间文章
制备高氯酸铵
内容:氯化
钠
很难溶于有机溶剂的
没有人讨论韩春雨NgAgo的事情?
smith
8年5个月前
回复于
生物学
内容:我对生物不了解,但是拿化学做比较打个比方的话,比如说我说我可以有发现有一种环境下和化合物催化下,把5-氨基四唑和亚硝酸
钠
一步简单快速安全地反应合成硝基四唑
钠
,那么我这个发现,在KC上面绝对是个大的发现了,然而这个方法我公布出来,大家都按照这个方法去实验,浪费了药品,确根本没得到1毫克硝基四唑
钠
,那么大家的失望是可想而知的,于是大家就会叫我去重现,而我来一句,这个反应需要“高超”的技巧,没有高超的技巧得不到结果
关于炮姐转职生产硝酸钾这档事(完)
7749
3年9个月前
回复于
化工矿冶
内容:高
钠
可比硝钾,强太多
点解NaOH制Na真坑爹!
江南夜雨
12年1个月前
回复于
化学
内容:制
钠
根本无需外部加热,在《氢氧化
钠
制
钠
》流程中!,最初在氢氧化
钠
中加少量水,然后电解,在5伏大电流的作用下,开始融化,最后
钠
会从集
钠
器中流出
SK–100p高能固体火箭发动机的制作
Antonio
1年8个月前
回复于
喷气推进
科创基金
内容:比较有意思的是,lz买的是氯化
钠
。
naclo4小剂量制备
y3yull
1年9个月前
回复于空间文章
naclo4小剂量制备
内容:这样制成的高氯酸
钠
纯度怎么样
[分享]常用溶液的配制
jcy669
17年5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
滴定液(0.1mol/L)。,硫化
钠
试液 取硫化
钠
1g,加水使溶解成10ml,即得。,亚硝酸
钠
试液取亚硝酸
钠
1g,加水使溶解成100ml,即得。,碱性亚硝基铁氰化
钠
试液 取亚硝基铁氰化
钠
与碳酸
钠
各1g,加水使溶解成100ml,碱性连二亚硫酸
钠
试液 取连二亚硫酸
钠
50g,加水250ml使溶解,加含氢氧化钾28.57g的水溶液40ml,混合,即得。,[检查] 取本液2ml,加入含氨0.05mg的水50ml中,应即时显黄棕色碳酸氢
钠
试液 取碳酸氢
钠
5g,加水使溶解成100ml碳酸
钠
试液 取一水合碳酸
钠
12.5g或无水碳酸
钠
10.5g,加水使溶解成100ml
穷困潦倒。。卖30g金属锶。
AsyncMaster
15年6个月前
发表于
跳蚤市场
内容:金属
钠
100g 。。,30元可以淘宝交易------------------------------------------更新,金属
钠
已经售出,金属锶继续。。
怎么制取高纯水
cp008006
15年10个月前
发表于
化学
内容:我要用高纯水配标准溶液校正
钠
度计,但是烧出来的蒸馏水达不到要求。,要求
钠
离子浓度小于0.2ug/L
从水溶液中制钠
TBsoft
11年4个月前
回复于
化学
内容:汞阴极电解,阴极上能得到
钠
汞齐,并不完全是因为氢在汞阴极上有很强的超电势,还有一个重要原因是:
钠
汞齐的电极电位不能等同于
钠
的电极电位,
钠
的标准电极电位是-2.71V,
钠
汞齐则大得多(如果比较绝对值就是小得多,),也就是说,
钠
汞齐要比
钠
容易还原得多。,
钠
汞齐并不是一种简单的合金,而是金属化合物,
钠
溶于汞,生成
钠
汞齐是一个强烈的放热反应,这也说明
钠
汞齐比
钠
要稳定得多。
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