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钠
的电镀。
液溴制取方法、实践经验报告
CIT
1年10个月前
发表于
化学
动手实践: 实验报导,严肃内容: 专业科普
内容:无法判断反应是否结束)器材准备:电热套(250ml)、圆底烧瓶(磨口24/29)、球形冷凝管(24/29)、转接头、干燥管、水泵、水槽先按照图示方法组装好仪器,尾气处理可以把干燥管换成塑胶管通入氢氧化
钠
或其他碱性溶液中计算需要多少液溴
Re:回 15楼(qharryq) 的帖子
qharryq
12年8个月前
回复于
科创基金
内容:很多人就是盲目的进行“创新”,合成新药前不推断其性质,没有注意到合成过程中可能会出现的危险(例如重氮盐中间体),往往以为随便换个阴阳离子合成新盐就是所谓的创新,悲剧往往就是这样发生的,例如偶氮四唑钾和偶氮四唑
钠
的感度简直一个天一个地
[实验展示] [原创] 简化版“班氏试剂”的配制——碳酸根离子对二价铜离子的络合作用初探
TBsoft
9年10个月前
回复于
化学
内容:在中文维基上搜索“碳酸铜”,也明确氢氧化铜可溶于碳酸钾生成配合物K2[Cu(CO3)2],那么碱式碳酸铜溶于过量碳酸
钠
生成配合物Na2[Cu(CO3)2]应该也是完全可能的。
生活中的化学常识,关系到衣食住行
gqq36
12年11个月前
发表于
化学
内容:而纯碱能与胆汁酸发生反应,生成物是胆汁酸
钠
,它可溶于水。,人们在制汽水时常用小苏打(碳酸氢
钠
)和柠檬酸配制,当把小苏打与柠檬酸混溶于水中后它们之间发生反应,生成二氧化碳气体,而瓶子已塞紧,二氧化碳被迫呆在水中,当瓶塞打开后,外面压力小了,二氧化碳气体便从水中逸出,人体所需要的矿物质或无机盐类,也就是指
钠
、钾、钙、镁、铁、硫、磷、硅、氯、碘、氟等元素的化合物说的。,人体所需要的
钠
盐和氯化物大多取自食盐,钾盐则大多取自蔬菜类。
简述科学
玄明
13年6个月前
发表于
科学技术学
内容:科学家们发现
钠
遇水会燃烧,你可以发现妈妈遇见尿床会燃烧;科学家发现蜡在高温下会融化,你可以发现蜡笔小新在裙子下会融化;科学家发现光速是30万公里/秒,你可以发现儿子做语文作业的速度是30字/小时;科学家发现在铁中加入碳可以使其坚固
【科普】生物大分子是如何“计算”生命逻辑的。
冬瓜哥
9年0个月前
发表于
农业
内容:对于一个
钠
钾泵来说,这个蛋白质分子可以根据两侧的离子浓度来决定是否启停(将某种离子运送到细胞膜另一侧)。
制假售假者曝甜蜜素掺假 重庆成“重灾区”
彼岸江山
15年11个月前
发表于
化学
内容:但B货加入了芒硝(硫酸
钠
),每吨1万至1.1万元,纯度不及正品的60%,因甜度降低,通常又加糖精来提高甜度。”
日本核污水排放一周年,我去了福岛核电站所在的小镇
硝化咸鱼
2个月26天前
发表于
核技术与核仪器
内容:落地式碘化
钠
闪烁体能谱仪带有数据显示的实时监测自动站(稍后还会看见好些个实物)两柜子个人剂量仪展品掏出761合个影路障情景模拟科普用的云室,效果相当好。
氯酸钠+苯甲酸钠----很猛的推进剂
mrsmith
14年9个月前
回复于
喷气推进
内容:苯甲酸
钠
本身是一个相对比较贵的东西,增加了成本,是否增加效益,也是这种东西有没有价值使用的因素。,苯甲酸
钠
其实不贵,通常用着防腐剂,尽管现在已经被山梨酸钾代替了,但是中国的食品还是在偷偷使用这种东西。
杭高天文社社用教材
客星晨出东方
1年10个月前
专栏文章
杭高天文社纪实
内容:大质量恒星(M>8M☉):大质量恒星与中等质量恒星不同,它们在经过氦燃烧后,中间的碳核心能够被平稳的点火,发生碳燃烧与氧燃烧,形成
钠
,氖,镁,硫,磷,硅等重元素,在核心碳氧也消耗完时,这些碳氧燃烧产生的废料也会燃烧
关于一些试车标准化的建议
leeqingyang
13年2个月前
发表于
喷气推进
内容::304 不锈钢管 挂箱架50cm 固定架80cm燃料 氧化剂 灭火剂 水箱(备用箱) 63PPr 1m 耐压1.2MPA 长度58cm 设计工作压力1.0mpa 额定容量 3.5升灭火剂组分:碳酸氢
钠
10%
又找到一篇比较详细的,可见毒性不高。
アストレア
15年1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:氨基亚铁氰化
钠
分光光度法(GB/T14376-93,水质)气相色谱法;分光光度法 《空气和废气监测分析方法》,国家环保局编5.环境标准:前苏联 车间空气中有害物质的最高容许浓度
【有机化学精品第四讲】-- 酯化反应
mithril
16年0个月前
发表于
化学
内容:但对于醇解及酯交换,采用碱催化剂(如醇
钠
)较酸催化剂更能加快反应速度,这是因为两者的反应机理不同。
过硫酸钠与铜反应的方程
TBsoft
7年5个月前
回复于
化学
内容:过硫酸盐与铜的反应,如果是中学阶段,写成以下反应方程式就行了(以过硫酸
钠
为例):Cu + Na2S2O8 = CuSO4 + Na2SO4或者:Cu + S2O82- = Cu2+ + 2SO42-如果是大学本科阶段
[转帖]树立正确的海洋观
玄明
19年1个月前
发表于
地理与地质
内容:海水中含量最多的是氯化
钠
,每立方公里中含着2700余吨。
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
回复于
科创基金
内容:2DMSO(试剂级)25元*2丙二腈(试剂级)140元*1盐酸羟胺(工业级)150元*1碳酸胍(医药级)200元*1水合肼(试剂级)25元*4双氰胺(工业级)110元*1氰基乙酰胺(试剂级)95*2叠氮
钠
(
[原创] 工业电解的一些基本知识——业余情况下电解制备化学品需要注意的问题
TBsoft
7年7个月前
回复于
化学
内容:引用 3.14:个人认为在电解的过程中溶液的温度会升高这个问题不好解决,之前用某宝上买的隔膜电解池(用于电解饱和食盐水制取氢氧化
钠
)合成盐酸。
探讨一下“绿色环保蚀刻剂”的成分
TBsoft
9年7个月前
回复于
化学
内容:很可能是过硫酸铵(或者过硫酸
钠
)和食盐的混合物。
【转】糖类的化学变化(全篇完...)
廖
4年11个月前
发表于
化学
内容: 糖的氧化与还原反应 ① 醛或酮糖与Tollens试剂(AgNO3-NH3)作用会产生银镜;与Benedict试剂(CuSO4、柠檬酸和Na2CO3)或Fehling试剂(CuSO4,酒石酸钾
钠
、,如亚硫酸盐的存在:亚硫酸氢
钠
与葡萄糖的反应为亲核加成反应,而加成产物与伯胺的反应则为亲核取代反应。 ,食品中常用的海藻酸
钠
、黄原胶及卡拉胶等即属于这样的多糖类化合物。
化学键归类,有助于揭示化学变化的电子偏移原理
白先森
11年10个月前
发表于
化学
内容:离子键是由带异性电荷的离子产生的相互吸引作用,例如氯离子和
钠
离子以离子键结合成氯化
钠
。
化学实验基础知识
神箭凌霄
16年1个月前
发表于
化学
内容:(2)用去污粉洗:去污粉是由碳酸
钠
、白土、细纱等混合而成的。,将要洗的容器先用水湿润(必需用少量水),然后,撒入少量去污粉,再用毛刷擦洗,它是利用碳酸
钠
的碱性具有强的去污能力,细纱的磨擦作用,白土的吸附作用,增强了对仪器的清洗效果。
【精品知识点】-- 高考化学复习热点问题专题训练--离子大量共存问题。
mithril
16年1个月前
发表于
化学
内容:如:Fe2+与NO3-能共存,但在强酸性条件下(即Fe2+、NO3-、H+相遇)不能共存;MnO4- 与Cl-在强酸性条件也不能共存;S2-与SO32-在
钠
、钾盐时可共存,但在酸性条件下则不能共存。
[转贴]有关斯特林发动机的一些资料
用户已注销
16年1个月前
发表于
机械与工具
内容:其燃烧室在外,燃烧的过程与工质无关,或者说只要有热源、冷源就能工作,无论烧煤烧碳都可以,只要能发热就行; 在凡尔纳的科幻小说《海底两万里》中,那艘著名的潜艇诺第留斯号的动力就是斯特林发动机,他的热源是采用
钠
与水反应生热
【有机化学第二讲】-- 硝化反应
mithril
16年1个月前
发表于
化学
内容:脱水剂:浓硫酸、冰醋酸、乙酐、五氧化二磷 硝化剂:硝酸、五氧化二氮N2O5、硝酸
钠
+硫酸 右图为硝基苯的制备过程:有机化学中最重要的硝化反应是芳烃的硝化,向芳环上引入硝基的最主要的作用是作为制备氨基化合物的一条重要途径
两份原创模拟试题
Aromatisation
1年11个月前
发表于
化学
严肃内容: 预印本
内容:加入3g的
钠
以除去可能存在的水并启动反应(或者可以使用Li);d. ,将1mol氯化
钠
加热至刚好熔融过程的ΔH与U0不相等D. ,仲钨酸
钠
铵法中,向除去Si的钨酸
钠
溶液中加入盐酸和NH4Cl,WO42-与NH4+、Na+形成化学式写作3(NH4)2O·Na2O·10WO3·15H2O的复盐(离子方程式,2分)。
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