Zinc Hydroxide
Zinc Hydroxide
CAS: 20427-58-1
Molecular Formula: H2O2Zn
Zinc Hydroxide - Names and Identifiers
| Name | Zinc Hydroxide |
| Synonyms | znmc hydroxide Zinc Hydroxide Zinc hydroxide zinc dihydrate ZINC HYDROXIDE Zinc dihydoxide zincdihydroxide UNII-OXK3V8KJ7L Zinc dihydroxide zinchydroxide(zn(oh)2) Zinc hydroxide (Zn(OH)2) EPA Pesticide Chemical Code 088501 |
| CAS | 20427-58-1 |
| EINECS | 243-814-3 |
| InChI | InChI=1/2H2O.Zn/h2*1H2 |
Zinc Hydroxide - Physico-chemical Properties
| Molecular Formula | H2O2Zn |
| Molar Mass | 99.39 |
| Density | 3.050 |
| Melting Point | 125, decomposes [HAW93] |
| Boling Point | 100°C at 760 mmHg |
| Water Solubility | slightly soluble H2O [HAW93] |
| Vapor Presure | 0Pa at 20℃ |
| Appearance | colorless orthorhombic crystals |
| Solubility Product Constant(Ksp) | pKsp: 16.5 |
| PH | 8.88(1 mM solution);8.88(10 mM solution);8.88(100 mM solution) |
| Storage Condition | Room Temprature |
| Stability | Stable. |
| Physical and Chemical Properties | Amorphous white powder or light yellow powder, relative density of 3.053. Melting point of 125 ° C (decomposition), at 120 ° C decomposition into zinc oxide, insoluble in water, soluble in acid, alkali solution and ammonia, is an amphoteric hydroxide. |
| Use | For the preparation of zinc oxide and zinc salts |
Zinc Hydroxide - Upstream Downstream Industry
| Downstream Products | Zinc oxide |
Zinc Hydroxide - Nature
Open Data Verified Data
set white powder or light yellow powder, relative density 3. 053. Melting point of 125 ° C (decomposition), at 120 ° C decomposition into zinc oxide and water, insoluble in water, is an amphoteric hydroxide. Soluble in strong acid to produce zinc salt. Soluble in strong alkali zincate formation. Unlike aluminum hydroxide, can be dissolved in ammonia to form zinc ammonium complex ion.
Last Update：2024-01-02 23:10:35
Zinc Hydroxide - Preparation Method
Open Data Verified Data
zinc salt method: zinc hydroxide was prepared by reacting zincite solution with sodium hydroxide, and the product was isolated by crystallization.
Last Update：2022-01-01 11:05:36
Zinc Hydroxide - Use
Open Data Verified Data
for the production of zinc compounds such as zinc oxide, zinc sulfate, zinc nitrate, etc. It is also used as an absorbent and rubber complex in surgical dressings.
Last Update：2022-01-01 11:05:35
Zinc Hydroxide - Safety
Open Data Verified Data
poisoning will appear poor appetite, polydipsia, fatigue, chest tightness and tenderness, causing hepatomegaly and pulmonary interstitial edema, alveolar epithelial destruction. Poisoning occurs with inhalable alkaline substances, intravenous injection of glucose (40% solution 20ml) and MG of ascorbic acid. The patient took cardiotonic drugs according to symptoms. The maximum allowable concentration in air is 0.5 mg/m3. During the operation, you should wear a gas mask, protective glasses and work clothes. Hot water bath after work. Attention should be paid to prevent the formation of vapor and aerosol and discharge to the workplace air, should pay attention to dust and ventilation. Lined with polyethylene plastic bags and external plastic woven bags, each 25kg or 50kg net weight. Store in a ventilated and dry place to prevent moisture and heat. Transport should be protected from rain and sun. Do not store and mix with acid and ammonium salts. When loading and unloading should be light to prevent packaging damage. When there is a fire, it can be suppressed by water, sand, and fire.
Last Update：2022-01-01 11:05:36
Zinc Hydroxide - Reference Information
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| introduction | zinc hydroxide colorless orthorhombic crystal. Relative density 3.05. After drying at 40~50 ℃, it conforms to the molecular formula composition and decomposes into zinc oxide and water when heated to 125 ℃. Insoluble in water, soluble in strong acid to form zinc salt, soluble in strong alkali to form zincate, soluble in excess ammonia to form zinc ammonia complex ions. Add an appropriate amount of sodium hydroxide solution to the zinc nitrate solution, and precipitate. |
| preparation | direct precipitation method: weigh 28.75 gZnSO4 · 7H2O and prepare 100mL of 1mol · L-1 solution, and prepare 2mol · LNaOH solution and 2mol · L-1Na2CO3 solution at the same time. Dose 10 mLZnSO4 · 7H2O solution in a 100mL beaker, place it on a magnetic stirrer, and start stirring. Quickly add 10mL of 2mol · L-1 NaOH solution to immediately produce white colloidal precipitate, and continue to stir for 5min until the precipitate does not increase. The above samples were centrifuged in a centrifuge of 5000r · min-1, filtered with double filter paper, and washed (first with water, then with anhydrous ethanol). Seal the product and store it in a fume hood. Under the same method and concentration, change the temperature, react at 25 ℃, 35 ℃, 45 ℃, 55 ℃, and save the sample. According to the above method, the solution reaction is carried out with different concentrations and changing the amount of NaOH added. The best molar ratio of ZnSO4 and NaOH for direct precipitation method is: 1 ∶ 2.32. |
| toxicity | poisoners will suffer from poor appetite, thirst, tiredness, chest tightness and tenderness, etc., causing hepatomegaly, pulmonary interstitial edema and alveolar epithelial destruction. Poisoning can occur by inhaling alkaline substances, intravenous injection of glucose (40% solution 20 m1) and 300 mg of ascorbic acid. Take cardiotonic based on symptoms. The maximum allowable concentration in air is 0.5 mg/m3. In operation, you should wear anti-virus masks, protective glasses and work clothes. Bathing in hot water after work. Attention should be paid to prevent the formation and discharge of vapors and aerosols into the air of the workplace, and dust prevention and ventilation should be paid attention. |
| use | used to produce zinc compounds, such as zinc oxide, zinc sulfate, zinc nitrate, etc. Used to make zinc oxide and zinc salt Used as analytical reagent, also used in rubber manufacturing and pharmaceutical industry |
| production method | zinc salt method reacts zincite solution with sodium hydroxide to prepare zinc hydroxide, and the product is separated by crystallization. |
Last Update：2024-04-09 21:21:28
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