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约找到 3027 条结果,耗时 0.329 秒
自制手机消毒机
放牛党主席
4年10个月前
回复于
极客DIY
内容:使用时有时需要除去其中的硫酸,方法是加入计量的醋酸
钠
。
二氧化硫气相催化氧化制备硫酸
赵冥毅
1年3个月前
回复于
化学
内容:如果使用过碳酸
钠
和过氧化氢(我有一桶20kg浓度50%),即使有难以想象的分解与干燥装置也无法维持连续几小时的大流量通气,成本更是会大大增加。
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:焦亚硫酸
钠
。 ,记者:等松子开口才能放硫酸
钠
? ,据工人讲,焦亚硫酸
钠
可以使开了口的松子颜色更白、更好看一些。,老板:这是用开水兑的,苯甲酸
钠
。 ,根据国家标准,泡菜的加工过程中,苯甲酸
钠
的用量不得超过万分之五。
化学物质英文简称(像我一样喜爱化学物理的新手阅读)
☆落花吹雪
15年10个月前
发表于
化学
内容: 正丁基 EDTA Ethylenediaminetetraacetic acid 乙二胺四乙酸二
钠
[实验贴图]减压蒸馏浓缩过氧化氢【2分】
六味地黄丸
14年0个月前
回复于
化学
内容:第二种: 本发明涉及无机化合物制备领域,特别涉及从申请号为871 03988专利申请中所得阴极产物的过氧化
钠
水溶液制备过 氧化氢的方法。,用磷酸或磷酸二氢
钠
将过氧化
钠
水溶液中和至 pH9.0~9.7,使生成Na-〔2〕HPO-〔4〕和H-〔2〕O-〔2〕,将所说的Na-〔2〕HPO-〔4 〕和H-〔2〕O-〔2〕水溶液冷却到+5~-5℃,,本 ----------------------------------------- 制备过氧化氢的方法,其特征在于,用下列步骤从过氧化
钠
水 溶液制备: (1)用磷酸或磷酸二氢
钠
(NaH↓〔2〕 PO,↓〔4〕)将过氧化
钠
水溶液中和至9.0~9.7,使 生成Na↓〔2〕HPO↓〔4〕和H↓〔2〕O↓〔2〕的水溶液, (2)使所说的Na↓〔2〕HPO↓〔4〕和 H↓〔2〕O↓〔2〕水溶液冷却到+5~-5
处女贴—关于开伞装置
qharryq
13年9个月前
回复于
喷气推进
内容:D型——可行性:50%—80%原因:由于我没有做过类似的实验,不清楚碳酸
钠
和盐酸(醋酸的)反应速率如何(听说貌似不慢),不敢妄下定论。
【申请科创基金A】高能材料RDX球形化技术的探究
trample
12年6个月前
发表于
科创基金
内容:球型RDX酸度检测方法: 滴定法:将制备出的球形RDX用溶剂溶解,再用标准氢氧化
钠
溶液滴定,以计算结晶的酸度。
回 7楼(小龙) 的帖子
冥灵
13年8个月前
回复于
化学
内容:但是,不知您怎样看待国外实验者用大量铝热剂PK液氮,用大量
钠
块和钾块与水反应,也不知道你看不看CCTV10的一些外国的节目。
回 14楼(侧卫007) 的帖子
焓熵`
14年1个月前
回复于
化学
内容:一个
钠
离子一个氢化过氧负离子。
尿素和铵盐合成胍的问题
Gdeestan
4个月24天前
回复于
化学
内容:使用的硅胶是通过以下步骤从液体玻璃(硅酸
钠
)制备的。
(参赛)“蓝色妖姬”——采用恒温(30℃-50℃)蒸发结晶法制备的硫酸铜晶体
全桥整流
2年10个月前
发表于
晶体养成所
动手实践: 实验报导
内容:如果追求高透明度,我建议用a4纸防尘(透气性很低,水蒸发很慢,几乎不会出现白斑和裂缝),蒸发慢一般不会出现大饼(经验所得),如果实在忍受不了大饼的苦恼,可以考虑氯化
钠
晶体,几乎不会大饼。
医药化工:“欣弗”事件
虎哥
14年3个月前
发表于
化学
内容:本人在参与盐酸克林霉素氯化
钠
注射液(输液)研究的过程中,就发现主药极易受温度影响,输液作为静脉滴注的产品,对其“无菌”与“内毒素”要求十分严格,为保证产品无菌,生产时输液都要进行灭菌,通常输液采用的灭菌温度为,最终我也没有研制出一批合格的产品,但为了报批,还是挑三批我认为不合格的产品送省所检验去了…… 一年之后,我们厂里研制的盐酸克林霉素氯化
钠
注射液取得了新药证书,没有发任何补充研究的批件,经理与车间主任很高兴,对于亲自参与该产品研究的我,清楚地认识到这意味着什么,这个产品上市后将会比克林霉素的氯化
钠
输液产生更大的危害。
星火计划 (用了一个寒假发射的探空气球)
富二代创始人
9年10个月前
发表于
航空技术
内容:然后是 使用氢氧化
钠
和硅铁粉以及水反应产生氢气; 具体反应方程式如下(直接拍照了。。。。
暑假最后之作
krew
15年6个月前
回复于
喷气推进
内容:原因在于我直接把KNSU压入发动机而未采取隔热措施,前2个甚至连包裹药柱的纸筒都没烧穿(纸筒经硅酸
钠
处理过)。
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:但是必须指出(强调):当用到金属钾、
钠
的操作以及无水操作时,决不能在水浴上进行,否则会引起火灾或使实验失败,使用水浴时勿使容器触及水浴器壁及其底部。
试问有办法把AgCl高效的转化成AgNO3吗
baozuyi
14年11个月前
回复于
化学
内容:一、主要化学反应 Fe+2HCl→FeCl2+2[H] 2AgCl+2[H]→2Ag↓+2HCl 二、操作过程 1、沉淀氯化银:在含氯化银的废液中,加入过量的氯化
钠
,使氯化银沉淀完全,然后过滤
多图,多数据:我进入了福岛核事故的隔离区
paclab
8年5个月前
发表于
核技术与核仪器
动手实践: 社会实践
内容:我携带了一台Ludlum闪烁体计数器,配两寸碘化
钠
:铊闪烁体,测量范围为10~400,000 cpm;两台基于Cs137穿透能量补偿过的卤素“pancake探头” 盖革剂量仪,型号分别是Fluke ASM
[转帖]一个化工男自大学至今12年化学之路遭遇的安全事故
msckmsck
11年3个月前
发表于
化学
内容:那次是我做
钠
砂,做完了之后,泡了石油醚切
钠
皮的培养皿我想拿去洗,用乙醇粹灭了就倒进了水池子(这是我犯的唯一的错误,有机溶剂是不能倒水池,而是要倒进废液桶的) 水池子四壁都是不知道是啥的有机物,粘了吧唧的,还有一次是,硫酸釜罐用碱水中和(溶液是浓硫酸),滴加60%氢氧化
钠
水溶液中和。,8.氰化
钠
残液。,其实氰化物没那么危险,氰化
钠
和氯化
钠
其实没什么区别,只要注意防护,勤洗手就行了。,当时我们用了1吨氢氧化
钠
片碱中和了所有的液溴。
介绍一下我两年来的工作:双平面质谱
Mr.ienore
8年4个月前
发表于
仪器仪表
动手实践: 实验报导,严肃内容: 专业科普
内容:后来我买了一个玻璃电阻规进行了校准(预先有优于0.02pa的真空,排封的),再将橡胶管用氢氧化
钠
汤熬一下。
额来一个比乙醚更XE的~~碘甲烷
watnb
14年10个月前
回复于
化学
内容:3、现场应急监测方法 4、实验室监测方法 1,2-萘醌-4-磺酸
钠
比色法《空气中有害物质的测定方法》杭士平主编 色谱/质谱法《固体废弃物试验分析评价手册》中国环境监测总站等译 热解吸-气相色谱法
一枚小型固体燃料火箭的设计/制作/发射
小叮当0312
1年4个月前
发表于
喷气推进
内容:下图为融化过后的knsb燃料和文章“标准化的knsb工艺”不同的是,我在燃料熔化后,加入了燃料质量的千分之三的月桂醇醚硫酸
钠
作为表面活性剂使燃料的流动性增强,以便于稍后的燃料装填。
常用危险化学品贮存通则[长帖]
虎哥
16年6个月前
回复于
化学
内容:B5.2 品名:过氧化
钠
编号:51002 别名:双氧化
钠
,二氧化
钠
化学式:Na2O2 分子量:77.99 特性:浅黄白色粉末或粒状物。,加温到380℃以上分解成亚硝酸
钠
和氧。 ,微吸潮,吸潮性比硝酸
钠
小。,B5.16 品名:过硫酸
钠
编号:51504 别名:高硫酸
钠
;过二硫酸
钠
化学式:Na2S2O8 分子量:238.13 特性:白色结晶性粉末,能逐渐分解,潮湿和高温能使分解加快。,强热约500℃分解为氧化铬及铬酸
钠
。
从阿波罗到“月球勘探者”
大仙
16年6个月前
发表于
天文与空间科学
内容:70年代乘坐阿波罗飞船登月的宇航员发现月球上有氦原子和氩原子;后来从地球上观测到月球上还存在
钠
和钾。,科学家们起初认为月球大气的主要成分是氦和氩,1988年发现其中还存在钾和
钠
元素。
治疟药青蒿素与中医无关
立棍
9年3个月前
发表于
科学技术学
内容:有机研究所和北京中药所的具体工作人员这期间做了大量反应,确定了青蒿素过氧的存在,也证明了过氧是青蒿素抗疟的活性基团;青蒿素的
钠
硼氢还原反应给青蒿素的衍生物的合成提供了可能;青蒿素的碱处理反应为后来青蒿素的定量分析提出了方法
延期药的配方与讨论
mosiluo
15年9个月前
发表于
化学
内容:络酸盐及重铬酸盐类:铬酸钡、重铬酸钡 (BaCrO)等27 硝酸盐类:硝酸钾、硝酸
钠
等。
实验综合资料
大仙
16年0个月前
发表于
化学
内容:6、制二氧化硫气体时,用浓H2SO4与亚硫酸
钠
反应。
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