Na2so4

I am just reading what a double replacement reaction is and what are the examples. So I came up with this question : what is a reaction actually? For example when we add $\ce$ forms as a precipitate. So hay! A reaction has occurred! But the reaction in the title doesn't form any precipitate depending on solubility rules. So does any reaction really takes place or the substances just dissociate into separate ions? A reaction occurs when the starting chemicals (molecules, ions) are changed into some different molecules (ions). This involves making and breaking bonds. It can include transferring electrons from one species to another. Just because a ppt is not formed does not mean that reaction has not occurred. In general chemists use a host of different techniques to determine the outcome of a reaction. Some of these are (in random order) measuring pH, quantitative analysis,titration, nuclear magnetic resonance (NMR), uv, visible, infra red & microwave spectroscopy, chromatography, xray scattering, mass spectrometry, and i've missed quite a few out. After all knowing what you have made, or if you have made it, is a major part of chemistry. Your question seems more philosophical then chemical in that you are aware of what happens and why, but want to attach semantic labels to various states and process involved. This study is called semantics. In information science, ontologies concern the codifying of semantics. While arguably not classically chemistry per se, ontologies are...

• العربية • Asturianu • تۆرکجه • Български • বাংলা • Bosanski • Català • Čeština • Dansk • Deutsch • Ελληνικά • English • Esperanto • Español • Eesti • Euskara • فارسی • Suomi • Français • Gaeilge • Gaelg • עברית • हिन्दी • Hrvatski • Magyar • Հայերեն • Bahasa Indonesia • Italiano • 日本語 • 한국어 • Кыргызча • Latina • Lietuvių • Bahasa Melayu • Nederlands • Norsk bokmål • Polski • Português • Română • Русский • Srpskohrvatski / српскохрватски • Simple English • Slovenčina • Slovenščina • Српски / srpski • Svenska • தமிழ் • ไทย • Türkçe • Українська • Oʻzbekcha / ўзбекча • Vèneto • Tiếng Việt • Winaray • 中文 • 粵語 Nātrija sulfāts Nātrija sulfāta struktūrformula Bezūdens nātrija sulfāts Citi nosaukumi glaubersāls CAS numurs 7757-82-6 (bezūdens sāls), 7727-73-3 (dekahidrāts) Na 2SO 4 142,04 g/mol Bezūdens sālim 2680 kg/m 3, dekahidrātam 1464 kg/m 3 1157 K (884°C) (bezūdens), 32,4°C (dekahidrāts) 1429°C (bezūdens) 4,76 g/100ml (0°C); 42,7 g/100ml (100°C) Nātrija sulfāts (Na 2SO 4, glaubersāls Na 2SO 4·10 H 2O) ir balta, kristāliska viela, kas šķīst ūdenī. Tas ir stabils, neitrāls Iegūšana [ | ] Lielāko daļu nātrija sulfāta iegūst kā derīgo izrakteni. Dažreiz (ievērojami retāk), nātrija sulfāts ir sastopams anhidrīda formā ( 2NaCl + H 2SO 4 → 2HCl + Na 2SO 4 Īpašības [ | ] Nātrija sulfāts Na 2SO 4 + H 2SO 4 ⇌ 2NaHSO 4 Tā ir līdzsvara reakcija un tās stāvoklis ir atkarīgs no temperatūras, koncentrācijas un citu vielu klātbūtnes. Nātrija sulfātam ir neparasta šķīdības atkarība no tempe...

Sodium Sulfate - Na 2SO 4 What is Sodium Sulphate? Sodium sulphate ( Na 2SO 4) is the sodium salt of Anhydrous sulphate is a white crystalline solid also known as the mineral thenardite, while the decahydrate Na 2SO 4.10H 2O has been known as Glauber’s salt or mirabilis. Na 2SO 4.7H 2O is transformed to mirabilite when it is cooled. Mirabilite is the natural mineral form of the decahydrate. About two-thirds of the world’s production of sodium sulphate is obtained from mirabilite. It is also produced from by-products of chemical processes such as hydrochloric acid production. Meaning of Anhydrous Anhydrous literally means “no water .” In chemistry, substances without water are labelled as anhydrous. The term is most often applied to crystalline substances after the water of crystallisation is removed. The name and function of salt compounds change with the presence or absence of water in their crystalline structures. For example, sodium sulphate, NaSO4, is called anhydrous sodium sulphate when free of water and is used as a drying material. That same compound in its decahydrate iteration is called “Glauber’s salt,” and is used to make glass. A molecule with no water molecule in it usually absorbs moisture from the salt to which it comes in contact with and hence use as a dehydrating agent. Table of Content • • • • • • Structure of Sodium Sulphate Properties of Sodium Sulphate Molecular formula Na 2SO 4 Molecular weight 142.04 gm/mole (anhydrous), 322.20 gm /mole (decahyd...

• 1S/2Na.H2O4S/c;;1-5(2,3)4/h;;(H2,1,2,3,4)/q2*+1;/p-2 WE1650000 性质 Na 2SO 4 无水：142.04 g/mol 十水：322.20 g·mol⁻¹ 外观 白色結晶狀固體 有 无味 2.664 g/cm 3（无水） 1.464g/cm 3（十水） 884°C（1157K） 1429°C（1702K） 无水： 4.76 g/100 mL (0 °C) 28.1 g/100 mL (25 °C) 42.7 g/100 mL (100°C) 十水： 19.5 g/100 mL (0 °C) 44 g/100 mL (20 °C) 难溶于 可溶于 −52.0·10 −6 cm 3/mol n D 1.468（无水） 1.394（十水） 结构 药理学 危险性 主要危害 刺激性 目录 • 1 形态 • 2 历史 • 3 化学性质 • 4 物理性质 • 5 结构 • 6 生产 • 6.1 自然资源 • 6.2 化学生产 • 7 应用 • 7.1 商業用途 • 7.2 造纸业 • 7.3 玻璃制造 • 7.4 纺织面料 • 7.5 食品工业 • 7.6 热储存 • 7.7 小规模应用 • 8 安全性 • 9 参考资料 • 10 外部链接 形态 [ ] • 无水硫酸钠；矿物形式为 • 七水硫酸钠：一种非常稀有的形态，为 • 十水硫酸钠：常被称为 历史 [ ] 十水硫酸钠被称为格勞勃鹽，以 sal mirabilis（神奇的盐），直到20世纪才發现其他有類似作用的藥物 在18世纪，芒硝开始被用作工业生产纯碱（ 化学性质 [ ] 硫酸钠是一种典型的静电结合的 Na 2SO 4 + BaCl 2 → 2 NaCl + BaSO 4 硫酸钠对大多数氧化剂或还原剂都没有反应。在高温下，它可以通过 Na 2SO 4 + 2 C → Na 2S + 2 CO 2 这一反应被用于 硫酸钠与硫酸反应，得到 Na 2SO 4 + H 2SO 4 ⇌ 2 NaHSO 4 硫酸钠略微显示出形成 4) 2（在39℃以上不稳定）和NaCr(SO 4) 2，而硫酸钾和硫酸铵则形成许多稳定的矾。 物理性质 [ ] 2SO 4在水中的溶解度曲线 硫酸钠在水中具有不寻常的溶解特性。 结构 [ ] 十水合物的晶体由具有 2O) 6] +离子组成。这些八面体共享边，故10个水分子中有8个与钠结合，另外2个是间隙性的，与硫酸根 生产 [ ] 硫酸钠的世界产量，几乎完全以十水合物的形式存在，每年约为550万至600万吨（Mt/a）。1985年产量为450Mt/a，一半来自自然资源，一半来自化工生产。21世纪后在2006年之前处于稳定的水平，自然生产增加到4Mt/a，化学生产减少到1.5至2 Mt/a，总产量为5.5至6 Mt/a。 自然资源 [ ] 世界上三分之二的十水盐产量来自矿物 用以制备硫酸钠的天然矿物主要有芒硝、无水芒硝、钙芒硝三种，其中芒硝和无水芒硝为硫酸钠及其水合物，钙芒硝为含钙钠的硫酸盐矿物，化学式为Na 2Ca(SO 4) 2，理论成分为22.29%Na 2O，20.16%CaO，57.55%SO 3， 化学生产 [ ] 世界上大约三分之一的硫酸钠是作为化学工业中其他工艺的副产品生产的。这种生产的大部分是初级工艺中固有的化学成分，而且只有很小的经济效益。作为副产品的硫酸钠生产正在下降。 最重要的硫酸钠化学生产是在 （ 英语 ： Mannheim process）中由氯化钠和硫酸生产，或在哈格里夫斯工艺中由二氧化硫生...

• Experimental Physico-chemical Properties • Experimental Melting Point: 32 °C Alfa Aesar 884 °C Alfa Aesar 884 °C OU Chemical Safety Data (No longer updated) 32 °C Alfa Aesar 884 °C Alfa Aesar 884 °C Oakwood 884 °C FooDB 883 °C Wikidata 884 °C Sigma-Aldrich 888 °C Strem 32.4 °C Kaye & Laby (No longer updated) 884 °C Oakwood • Experimental Refraction Index: 1.484 Alfa Aesar • Experimental Solubility: 19.1% w/w in 20?C water Kaye & Laby (No longer updated) 42.2% w/w in 100?C water Kaye & Laby (No longer updated) insoluble in ethanol Kaye & Laby (No longer updated) Soluble in water. Insoluble in alcohol Alfa Aesar • Experimental Density: 1.46 g/mL Alfa Aesar 2.68 g/mL Alfa Aesar 2.68 g/mL Oakwood 2.68 g/l Wikidata 2.68 g/mL Sigma-Aldrich 1.464 g/mL / 20 °C Kaye & Laby (No longer updated) • Miscellaneous • Appearance: White crystals or powder OU Chemical Safety Data (No longer updated) • Stability: Stable. Incompatible with strong acids, aluminium, magnesium,strong bases. Hygroscopic. OU Chemical Safety Data (No longer updated) • Toxicity: ORL-MUS LD50 5989 mg kg-1, IVN-RBT LD50 1220 mg kg-1 OU Chemical Safety Data (No longer updated) • Safety: IRRITANT Alfa Aesar Minimise contact. OU Chemical Safety Data (No longer updated) WARNING: Causes GI injury, skin and eye irritation Alfa Aesar WARNING: Irritates lungs, eyes, skin Alfa Aesar Patents Personal Collections Publication or Magazine Article Web-based Article (blog or commentary) Available Chemicals Databases Biological Prop...