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发表于
化学
内容:立刻开始有反应 然后就是加热,这仪器是自己有程序升温到420℃,在这个温度下,浓硫酸会沸腾蒸出三氧化硫,对环境污染极大,所以在左边有水泵和废气吸收装置,将蒸汽抽走并通入事先配制好的浓氢氧化
钠
溶液中此时能看到液体在剧烈沸腾
贵金属的回收2(黄金的回收)
mantis63115
18年9个月前
发表于
化学
内容:将此事不容的部件经泡在王水中,加热至微沸,使金、钯、铂等贵重金属溶解,更具溶液中贵金属的含量高低加入适量水稀释至一定浓度,再用亚硫酸
钠
或草酸、甲酸、水合肼、硫酸亚铁、甲醛等还原剂将溶液中的金还原成金颗粒沉淀下来
无机硫氰酸盐手记-非金属篇
gkaf2007
11天22时前
回复于
化学
内容:毫升浓盐酸并稀释至50毫升的水溶液混合搅拌,然后静置半个小时即可结晶出Se(SCN)₂3H₂SeO₃+7HSCN=3Se(SCN)₂+5H₂O+HCN+H₂SO₄ 产物分别用冰乙酸和乙醚洗涤,在氢氧化
钠
上真空干燥后,在无水情况下他可以在278K以下黑暗中稳定几周,加热到356~358K分解,在室温下与水,稀盐酸,稀氢氧化
钠
溶液,低级醇和吡啶作用而被分解,水解产物主要是硒,亚硒酸和硫氰酸根,二硫氰酸硒既具有氧化性又具有还原性
业余火箭活动的基本矛盾是什么?
novakon
9年11个月前
发表于
喷气推进
内容:如果以上结论正确,我们就可以进一步得出:如果要进一步发展中国业余火箭活动,就要解决以上矛盾,比如想办法从奸商那里购买硝酸钾,想办法从肥料或者硝化细菌培养基中提取硝酸钾,想办法用硝酸
钠
和硫酸钾置换出硝酸钾
申请A基金 新型含能化合物工艺研发资金(I)
哈哈哈哈哈士奇
7年0个月前
发表于
科创基金
内容:元将用于购买以下优选重点项: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
(
氨氧化法制硝酸和乙醚的制备(转载)
coulson21
14年8个月前
发表于
化学
内容:在干燥管(3)内装有生石灰或固体氢氧化
钠
。,反应系统中,因往氨水里鼓气使氨气中含有水,如不及时进行处理,造成催化剂吸湿,故可用固体氢氧化
钠
或新制的生石灰对其进行干燥。
常见植物药、矿物药、动物药等自然提取药物汇总
虎哥
3年10个月前
发表于
医学
内容:三、矿物药【氯化
钠
】 Sodium chloride NaCl从咸水湖、海水或咸水井提取的化合物,用于补充电解质,调节渗透压。
【原创】化学之最
彼岸江山
16年0个月前
回复于
化学
内容:钋的毒性 钋210毒性比氰化物高1000亿倍,算一算,0.1克钋可以杀死100亿人(氰化
钠
对人致死量0.1克,),钋-210属于极毒性核素,它容易通过核反冲作用而形成放射性气溶胶,污染环境和空气,甚至能透过皮肤而进入人体
化学实验安全注意事项
zhaokenb
13年9个月前
回复于
化学
内容:在双手潮湿的情况下,切勿触碰插座等带电设施73.电器失火情况下可以使用细沙扑灭,有条件的使用干粉灭火器,不得使用水进行灭火74.在酒精灯打翻或其他易燃液体在燃烧状态下在桌面流动时,应使用湿抹布盖灭(倘若其中有
钠
、,即使在通风的阳台的条件下也不得进行有毒气体的操作,除非具有具有防护措施(一般的防毒面具可能还不行,应在通风橱中进行操作),绝对不可以在小区的开阔场地进行此类实验,避免造成人员伤亡85.甲烷不得与次氯酸
钠
溶液在无防护条件下进行反应
【实验】从零开始制备烟硝
赵冥毅
1年8个月前
回复于
化学
内容:即使五氧化二钒和偏钒酸铵都管制了,偏钒酸
钠
还在。
磷化工艺
子羽
16年6个月前
发表于
化学
内容:酸性清洗剂主要由表面活性剂(如OP类非离子型活性剂、阴离子磺酸
钠
型)、普通无机酸、缓蚀剂三大部分组成。,常用强碱液清洗配方与工艺如下:氢氧化
钠
5%~10%硅酸
钠
2%~8%磷酸
钠
(或碳酸
钠
) 1%~10%表面活性剂(磺酸类)2%~5%处理温度 >80℃处理时间 5~20min处理方式浸泡、喷淋均可强碱液除油脂需要较高温度,无机型助剂主要是硅酸
钠
、三聚磷酸
钠
、磷酸
钠
、碳酸
钠
等。,一般常用的低碱性清洗液配方和工艺如下:浸泡型 喷淋型三聚磷酸
钠
4~10g/l 4~10g/l硅 酸
钠
0~10g/l 0~10g/l碳 酸
钠
4~10g/l 4~10g/l消 泡 剂 0 0.5~,耐蚀性:检测磷化膜本身的耐蚀性可采用硫酸铜点滴法,氯化
钠
盐水浸泡法和盐雾试验法。
转帖 长期接触有毒化学品的人应吃些什么抵御?
子羽
14年4个月前
发表于
化学
内容:含VB1、VB2、VC、VD、VE、优质蛋白质、钾、
钠
、铁、磷、乳酸、苹果酸、淀粉酶、氧化酶等。
实验展示:白云石中钙含量的测定
化学小僧
12年0个月前
回复于
化学
内容:2.标定是使用草酸
钠
,其易提纯,与高锰酸钾反应定量,易于保存,故多用做基准试剂;3.钙含量的测定有多种方法,比较有代表性的是:1.EDTA法;2.氧化还原法;4.这里使用稀的沉淀剂、较热的温度、较长的陈化时间
环卫工接触剧毒瓶受重伤 十个指甲全被剥离(转)
立棍
13年10个月前
回复于
科学技术学
内容:过去我曾连续几个月用氢氧化
钠
当肥皂洗手,喝工业酒精兑盐酸(工业酒精里碱太多,难喝)代替二锅头。
天然广谱抗生素—大蒜素
雪瑷微瑕
16年3个月前
回复于
化学
内容:2.先将大蒜油与吐温-80调匀,再把注射用水少量多次地加入,使全部溶解后用10%氢氧化
钠
调节pH至10.8~11.2(pH计测定),煮沸15分钟,待冷后放冰箱中冷藏过夜,双层滤纸过滤,再用G3垂熔玻璃漏斗精滤,有的处方中加入亚硫酸氢
钠
(约0.3‰)为抗氧剂,可防止在提取及灭菌时受热失效。,亚硫酸氢
钠
可于蒸馏结束后立即加入或预先置于收集瓶中。
回 楼主(四次) 的帖子
zhaokenb
11年5个月前
回复于
化学
内容:有可能生成的是分子量较小的片段所以,不妨试试取沉淀物然后加氢氧化
钠
溶液,长时间煮沸试试,看看沉淀是否溶解,不过从某些文献看来,此法无法把PET解聚为更小的单体。
土农牌双级RO膜处理系统组成②
hamdad
9年5个月前
回复于
物理
内容:10、高压开关(系统产水管路压强高于0.25MPa动作)连接在线电导率仪表电导池,系采用一枚报废的250W高压
钠
灯玻璃壳子制作。
无土栽培中营养液的成分
lib
11年7个月前
发表于
农业
内容:什么味精胡椒想加就加吧:) 常用的要配齐的话在30个品种以内含硝、硫、磷酸,氢氧化钙、钾、
钠
(多在配工作液和管理营养液调整pH等使用)。
火箭版研究课题综述与推荐(不断更新中)
虎哥
13年2个月前
回复于
喷气推进
内容:入门级:推广KNSB,热浇注工艺;进阶级:KN(或硝酸
钠
)-聚乙烯或其它粉状高分子粘接剂,压铸工艺;专业级:RAP,HTPB-AP等,真空浇注,常温或加温固化。
Schiemann反应简介
carneades
14年6个月前
回复于
化学
内容:合成操作 在冷的芳基重氮盐水溶液中加入氟硼酸(HBF4)或氟硼酸
钠
(NaBF4)溶液,立即析出重氮氟硼酸盐晶体。
【拆解】搞到个疑似是LYSO闪烁体的PETCT模块
TubeChip404
4年4个月前
发表于
核技术与核仪器
内容:因此在作为闪烁体使用的过程中,会有一定的自身计数率,根据手册中提到的数据,LYSO的自然计数率是39cps/g,那么这坨闪烁体的自然计数率是9555cps,这个计数率蛮高的,我在帖子DIY碘化
钠
闪烁体伽马能谱仪中使用的
你在那里
大仙
16年6个月前
发表于
天文与空间科学
内容:这颗行星的大气中含有大量的
钠
元素,但是要比科学家预计的要少(早些时候科学家已经确定这颗行星类似于木星,表面相当的热),这可能是因为行星大气高层的云挡住了部分光线导致的误差。
环卫工接触剧毒瓶受重伤 十个指甲全被剥离(转)
jrcsh
13年10个月前
回复于
科学技术学
内容:过去我曾连续几个月用氢氧化
钠
当肥皂洗手,喝工业酒精兑盐酸(工业酒精里碱太多,难喝)代替二锅头。
化学入门采购以及kn的提纯
Ruzen
1年11个月前
发表于
化学
内容:5.15cm玻璃搅拌棒6.吸水纸7.200ml烧瓶(配橡胶塞)8.橡胶软管9.蛇形冷凝管15cm10.50ml塑料量杯11.电子温度计 然后就是药品了,因为我需要提纯kn,所以要碳酸钾,晶体需要氯化
钠
和硫酸铜,kn,山梨糖醇,三氧化二铁,碱式碳酸铜,氢氧化
钠
,稀盐酸
尝试使用pcb参与制作电解池的构建
反氕
3个月14天前
发表于
极客DIY
动手实践: 实验报导
内容:据我家人说应该是六平方的 吧😅)满载电流的情况应该也还算够吧原本不打算做快接口的,每根线对一个接口然后发现塞不进😂,后来就改了快接电极:阳极:有石墨,钌铱钛,二氧化铅,二氧化锰,四氧化三铁(磁铁)电解氯酸
钠
用铱钽钛
关于火箭壳体材料的研究
ksama
13年6个月前
回复于
喷气推进
内容:Polyvinylchloride,PVC) 熔化温度:185~205℃ 氯乙烯具有阻燃(阻燃值为40以上)、耐化学药品性高(耐浓盐酸、浓度为90%的硫酸、浓度为60%的硝酸和浓度20%的氢氧化
钠
)
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