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约找到 3027 条结果,耗时 0.273 秒
关于碘时钟
powkp
14年0个月前
回复于
化学
内容:.......结果没人看[s:233]我自己也没做过这个实验,只能把资料原模原样发一下:实验准备:配置下列三种溶液溶液A:秤取0.9g碘酸钾溶于温水,再稀释至500ML溶液B:秤取0.45g无水亚硫酸
钠
,
从草木灰中提取“木灰碱”,我真的做到了
Johnny-Wei
10年4个月前
回复于
化学
内容:本帖最后由 Johnny-Wei 于 2014-9-14 22:54 编辑 如果原料不混入食盐,得到的草木灰中含
钠
几乎为0,除了含钾还含有磷、钙、镁、硅、硫元素和铁、锰、铜、锌、硼、钼等微量元素。
【KC2#液机】--催化剂及催化床载荷热试车
ehco
13年0个月前
发表于
喷气推进
内容:50Kg(满载)燃料:92PC H2O2、煤油比冲:250S总冲:3000NS设计室压:3MPa混合比:7.22:1材质:316L不锈钢、40Cr合金钢过氧化氢浓度:92%(密度1.41@20℃、锡酸
钠
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kc-88087
10个月6天前
发表于
化学
动手实践: 实验报导
内容:至此就可以加入AN复分解了复分解得到了一些AP,很干净,很美丽不过想通过结晶得SP还是要去除钡离子然后向一盒溶液里面加入稍过量的碳酸
钠
溶液去除有毒的Ba2+ 再再次痛苦地过滤,就能得到一杯比较安全的溶液
Re:三氯异氰尿酸C3Cl3N3O3  如何分解
拔刀斋
14年6个月前
回复于
化学
内容:警方当晚对现场进行了勘察,并询问承包防空洞的责任人,确定烟雾是人防设施承包人员在防空洞内点燃药物(优氯净,化学成分:二氯异氰尿酸
钠
),进行消毒杀菌时所产生,大量烟雾通过防空洞的透风口涌入了熊猫馆。
浅谈食品安全:从开始到开始 孟超/文
子羽
14年4个月前
发表于
化学
内容:很多人知道它和我们吃的盐:"氯化
钠
"是兄弟,但鲜有人知道,我国目前的安乐死的执行,所使用的即是氯化钾这种物质,其实就毒性而论,安乐死用的量远远不足可以致人死命,可是其致命的是摄入的方式: 静注。,通过静脉注射氯化钾,利用钾
钠
离子的渗透压差,造成恶性心律失常而死。
硝酸铵钙制77%硝酸
章鱼wheat
5个月27天前
发表于
化学
动手实践: 实验报导,严肃内容: 教程/课程
内容:不过之前我尝试制取少量铵的时候投入的碳酸氢铵和理论值比较类似 我就直接带入计算了,可以通过分段添加碳酸氢铵 添加一些碳酸氢
钠
听一下有没有气体放出 然后静置或丢去磁搅一段时间 再用耳朵凑近听看看还有没有气体放出,如果没有了代表添加的碳酸氢
钠
都反应完了 再次重复添加碳酸氢铵 直至添加碳酸氢铵没有声音 来自行判断硝酸钙的含量 其实由于硝酸铵钙几乎不要钱,加少或加多造成的产率变化也没什么关系单纯把硝酸铵钙自带的结晶水带入计算可知理论浓度
生命是什么?E.薛定谔
thallium2012
14年10个月前
回复于
生物学
内容:关于晶体,我们学到的是它们形成了周期性的三向堆叠的晶格,晶格里的单个分子的结构有时是可以识别的,酒精和许多有机化合物就是如此;在其他的晶体中,比如岩盐(氯化
钠
,NaCl),氯化
钠
分子是无法明确地区分界限的,,因为每个
钠
原子被六个氯原子对称地包围着,反过来也是如此;所以说,如果有
钠
氯原子对的话,那么,不管哪一对都可以看作是氯化
钠
分子的组成。
西方文明起源于中国 英语英人起源于中国
Syscus-AC
5年4个月前
回复于
科学技术学
内容:那好,1.请解释以下词:will,should,me,open... ... 2.对于“商铺”,请证明是英文抄中文,不是中文抄英文. 3.请解释为什么过氧化
钠
英文不是
镓铟锡合金系列之二——镓铟锡合金的化学性质研究
火星居士
11年0个月前
发表于
化学
内容:依然取合金约1g,使用碱为氢氧化
钠
( ),浓度约为40g/L,即取约2g氢氧化
钠
,加水50mL配制溶液。
Evans辅基控制的不对称Mukuyama Aldol反应
在下松田诚一
4年0个月前
发表于
化学
内容:合并有机相,无水硫酸
钠
干燥。
相变散热材料及其在电磁枪中的应用前景
三水合番
6年9个月前
发表于
电磁炮
严肃内容: 专著/论述
内容:常见的适合用于电磁枪散热的相变材料中,固-液相变的例如石蜡、三水合醋酸
钠
、低熔点合金;液-气相变的例如水;固-固相变的例如新戊二醇,改性的聚乙二醇等。,散热功率上,有机相变材料如石蜡,导热率约为0.2W/(m*K),无机相变材料如三水合醋酸
钠
,导热率约为1W/(m*K),通过添加部分高导热率材料如膨胀石墨,可以大幅度提高相变材料的导热率到几至十几W/(
Re:建议:
xj198398xujing
16年5个月前
回复于
化学
内容:二氧化铅电极与氯生成氯化铅及氧同上, 石墨是当前能使用的材料中性价比比较高的(腐蚀速率比较小,价格便宜)目前要解决的主要问题是如何能使剥落的石墨电极快速氧化为CO2而不至于堵塞隔膜 3:玻璃是一种钙
钠
的硅酸盐融合物自身偏酸性
汽车不用油?有望解决石油短缺问题的替代燃料
mass_lynnxy
18年5个月前
发表于
极客DIY
内容:另一个替代方法是作为金属氢储存,或者是硼氢化
钠
、氢化铝锂,或者是氨硼化氢。,硼氢化
钠
是热门,因为它可以不用铂催化剂,直接作为燃料使用。,另一方面,回收硼氢化
钠
耗能也很大。
【实验报告】从沙子中提取二氧化硅
思念·落叶
13年5个月前
发表于
化学
内容:故推测白色絮状物为氢氧化钙和硅酸
钠
的混合物) 3.加热蒸干。
关于制氧的设计
asdw_15951
13年0个月前
回复于
化学
内容:首先,基础打扎实:A:方法一是过氧化
钠
+氧化氢(94水啦)B:方法二是过氧化氢+高锰酸钾C:方法三是电解水(不是很现实)我们主要运用第二种但是这种有一个坏处,就是原料都有腐蚀性,制作要小心目标:一、质量不超过
常用火箭推进剂配方
晨钟暮鼓
12年9个月前
发表于
喷气推进
内容:碳............................................ 24硫............................................ 4#7(硝酸
钠
推进剂火箭推进剂,制备方法:硝酸
钠
.................................... 69碳............................................ 27硫.....
公安部公布2017年版易制爆危险化学品名录
TBsoft
7年6个月前
回复于
化学
内容:它们并不具备爆炸性,在已经加强管制硝酸的情况下,也难于成为制爆原料,因此2017年版明确只管制二硝基甲苯、二硝基萘和二硝基苯酚的几个异构体,以及可能存在的盐,另外2011年版中已经管制的4,6-二硝基-2-氨基苯酚
钠
(,苦氨酸
钠
)继续管制。
【科创基金2018H7】几种纯净无机酸及无水盐的实验室制备(I),第二期 迟到的结题报告
chemistry02
2年9个月前
发表于
化学
动手实践: 实验报导
内容:设定制备硝酸30g,计算得需要硝酸钾48.14g,浓磷酸48.18g,并且需要用至少5.04g无水磷酸二氢
钠
尽可能吸收磷酸中的水。,【实验室制取浓盐酸】设定制取含30gHCl的38%浓盐酸,计算得需要氯化
钠
48.08g,浓磷酸83.25g,并额外加水21.58g。
无机硫氰酸盐手记-非金属篇
gkaf2007
11天23时前
回复于
化学
内容:AS₁ 异硫氰酸硅 四异硫氰酸硅最早是由硫氰酸铅和四氯化硅反应制备的,虽然用
钠
、钾、铵、银、铅和铜硫氰酸盐与四氯化硅反应都可以产生,但是用硫氰酸银或硫氰酸铵曾得到最高的产量,这里选择用铵盐做操作。 ,在一枝两升有标准口的三颈圆底烧瓶上装备一架马达带动的搅拌器,一支温度计,一支120毫升滴液漏斗和一只300毫升长的冷凝管,在冷凝管上有一只装了无水硫酸钙的干燥器,在此烧瓶中将研磨成细粉的硫氰酸铵约190克同800毫升经过
钠
干燥的无水苯相混合
硝铵推进剂的一点资料,百度到的
jetliao
13年8个月前
发表于
喷气推进
内容:的推进剂燃速的1.4倍。特别是添加表面活性剂A可使推进剂AN的极限含有率增加到85wt%,这对提高燃速是很有效的。 3 结论 1)采用表面活性剂降低未固化推进剂的粘度,本试验所用的17种表面活性剂中除肉豆蔻酸
钠
、,硬脂酸
钠
和亚油酸
钠
外其它都是有效的,特别是月桂基胺效果最大。 2)本试验装置未能测量出AN极限含有率附近的粘度,测量了不同AN含有率时的剪切应力。 3)未添加表面活性剂时,只能制造AN含有率为81wt
无机硫氰酸盐手记-非金属篇
gkaf2007
12天14时前
回复于
化学
内容:可以通过叠氮化
钠
与二硫化碳反应制备,将混合物在40度保持48小时后在零度以下用冷浓盐酸处理溶液得到白色或淡黄色结晶沉淀,叠氮二硫代碳酸在低温下可以保存20至48小时而不发生明显的分解,酸易溶于水,也可以溶于有机溶剂,产物和盐都是极其易爆的,但它的爆炸不像叠氮二硫化碳那样猛烈,它的爆炸颇类似于黑色火药或亚硝基胍,在常温下酸会自发分解产生硫氰酸 HS.CS.N₃=HCNS+S+N₂ 叠氮二硫化碳可以通过制得的叠氮二硫代碳酸
钠
过滤溶液五毫升用水稀释到,在不断搅拌下一滴滴加入溶解在碘化钾中的当量碘溶液,直到叠氮二硫化碳完全沉淀为止,不过应该避免使碘有些微量的过量,因为会被迭代二硫化碳吸附,用洗涤的方法非常困难的才能将碘除去,如果不小心加入过量的碘可以加入少量的叠氮二硫代碳酸
钠
稀溶液将碘还原
探讨一下“绿色环保蚀刻剂”的成分
herrick
9年7个月前
发表于
化学
内容:蓝色环保蚀刻剂的成分我们清楚的,是过硫酸铵或过硫酸
钠
,因为反应生成硫酸铜呈蓝色而得名。
(教程)从电池中提取原料
mithril
15年8个月前
回复于
化学
内容:灼烧过程中会放出大量的氮氧化物,故需要作废气吸收处理,常用的吸收剂是氢氧化
钠
溶液。
电解法制盐酸及硝酸蒸馏残渣的再利用
xj198398xujing
1年3个月前
回复于
化学
内容:当时没有搭建氯氢燃烧装置未能验证产出气体量能不能维持氢氯燃烧只是顺带提及方法给楼主造成困扰但不燃烧不代表不能通过其他渠道获得氯化氢气体 原贴使用的是氯代醋酸合成氯乙酸 付产氯化氢气体获得盐酸 这个过程可以在业余条件下得到多种产品 在不考虑获得氢氧化
钠
的情况下更经济
奶粉算什么,食品还有安全的吗?
mass_lynnxy
16年3个月前
回复于
科学技术学
内容:工人:这是食品防腐剂亚硝酸
钠
,这东西吃了要不得。 ,亚硝酸
钠
作为一种防腐剂,在食品中添加的剂量国家有严格的规定。
[讨论]学术分制度是否可改进一下
虎哥
17年11个月前
回复于
化学
内容:甲烷的制取实验 醋
钠
碱灰水无影, 操作收集与氧同。,解释: 1、醋
钠
碱灰水无影:\"醋
钠
\"指醋酸
钠
;\"碱灰\"之碱石灰。,这句的意思是说必须用无水醋酸
钠
跟干燥的碱石灰反应来制取甲烷(否则若用醋酸
钠
晶体或石灰不干燥则均几乎不能产生甲烷气体)。,[联想:不能直接用氢氧化
钠
跟无水醋酸
钠
反应,一方面是因为氢氧化
钠
极易吸收空气中的水分;另一方面纯氢氧化
钠
受热时对玻璃试管有腐蚀作用]。,\"液稀\"的意思是说所用的硫酸铜溶液、氢氧化
钠
溶液、乙醛溶液一定要稀;\"碱多\"的意思是说该实验中碱(氢氧化
钠
)要过量,而所用的硫酸铜的量一定要少。
申请A基金高能量密度化合物研发及和合成优化资金
哈哈哈哈哈士奇
7年0个月前
发表于
科创基金
内容:3,5-二取代-1,2,4-三唑类化合物是一种重要的含能材料及中间体,其传统合成方法会产生大量的“三废”,其中以
钠
盐为主的易溶无机盐杂质对于产品后处理影响很大,且提纯产物过程中使用大量甲醇溶剂,大大增加了反应容器的体积,故在此项楼主列举部分为优选重点购买项:氯化亚砜(试剂级)发烟硫酸(试剂级)二氯甲烷(工业级)DMF(试剂级)DMSO(试剂级)丙二腈(试剂级)盐酸羟胺(工业级)碳酸胍(医药级)水合肼(试剂级)双氰胺(工业级)氰基乙酰胺(试剂级)叠氮
钠
(
[建议]化学品安全标签编写规定 GB 15258-1999
bomb
17年7个月前
发表于
化学
内容:饮温水,催吐,就医B81 误食,饮温水,催吐,洗胃,就医B82 误食,饮水,催吐,洗胃,导泄,就医 B83 误食,给饮植物油,催吐,就医 B84 误食,漱口,饮牛奶或蛋清,就医B85 误食,用5%硫代硫酸
钠
洗胃,B86 误食,用1%硫代硫酸
钠
洗胃B87 误食,催吐,用碳酸氢
钠
溶液洗胃B88 误食,催吐,用植物油洗胃和灌肠B89 误食,立即用2%硫酸铜洗胃B90 误食,用硫酸
钠
溶液洗胃,导泄 B91 误食,催吐,
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