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Nitrogen element and hydrazoic acid
Time of Update: 2021-06-18
1. 1 Elemental NitrogenThe two atoms in the N 2 molecule are joined by a triple bond, which is very stable at room temperature .
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The color change principle of acid-base indicator
Time of Update: 2021-06-18
indicate the acid-base of the solution because the dissociation equilibrium of the indicator molecules does not move at the same time, and the undissociated molecules and the dissociated products have different colors. , So that the solution has
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Soft and hard classification of acid and alkali
Time of Update: 2021-06-18
1. The soft and hard classification of acid and alkali>On the basis of the acid-base electron theory, the acid-base is classified into soft and hard
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Calculation of Hydrolysis of Weak Acid and Strong Alkali Salt
Time of Update: 2021-06-18
>Θ , it can be calculated approximately, that is, c0-[OH-]≈c0, then>>Similar to the degree of dissociation, the degree of hydrolysis refers to the fraction
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Preparation and properties of halogen acid, halogen acid and their salts
Time of Update: 2021-06-18
8HC1O 3 =4HCIO 4 +2Cl 2 +3O 2 +2H 2 O4HBrO 3 =2Br 2 +5O 2 +2H 2 OThe thermal stability of halogen acid salt is higher than that of the corresponding acid, but it also decomposes when heated .
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Calculation of weak base and strong acid salt hydrolysis
Time of Update: 2021-06-18
4 CI strong acid salt of a weak base, completely dissociates in water to generate NH2 .
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Dissociation of multiple weak acids
Time of Update: 2021-06-18
>The total dissociation reaction formula of H 2 S is>>The equilibrium constant of the total dissociation reaction
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Hydrolysis step of weak acid and weak base salt
Time of Update: 2021-06-18
The [H + ] and pH of the weak acid and weak base salt solution can be obtained by the following method .
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Acid-base dissociation theory and acid-base proton theory
Time of Update: 2021-06-18
Protic acid according to the theory, the reaction is called a proton donating acid substance, such as the HCI, NH2 .
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Dissociation balance of weak acid and weak base
Time of Update: 2021-06-18
Therefore, the initial concentration of the acetic acid solution can be calculated according to the dissociation reaction formula and equilibrium constant.
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These twelve types of commonly used drugs will increase uric acid!
Time of Update: 2021-06-17
The data suggests that in patients with gout and diabetes, the blood uric acid level increases by an average of 75 μmol/L after insulin treatment [3].
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Phosphorus oxo acids and their salts
Time of Update: 2021-06-17
Phosphorous acid and its salts are strong reducing agents and are easily oxidized to the highest oxidation state of phosphorus .
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The price of hydrofluoric acid fell to 10,000 yuan
Time of Update: 2021-06-17
Falling fluorite prices have lowered the production cost of hydrofluoric acid and helped the market decline .
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Preparation of nitric acid
Time of Update: 2021-06-17
E. g(5) Nitrate with crystal water, if the polarizing ability of the metal ion is strong, the hydrolysis reaction will occur when it is decomposed by heat, and it may be accompanied by the decomposition reaction of nitric acid .
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Carbonic acid and its salts
Time of Update: 2021-06-17
The single-electron-containing orbital of C that is not involved in the hybridization forms a π bond side by side with the other single-electron-containing orbital in the terminal oxygen atom .
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Covestro Shanghai Hydrochloric Acid Oxidation Unit has officially opened recently
Time of Update: 2021-06-15
The operation of Deacon II will add an additional 160,000 tons of low-cost, low-energy chlorine gas production to Covestro's Shanghai integrated base each year .
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The main body of the acetic acid storage tank of the Yizheng Chemical Fiber PTA Project was completed
Time of Update: 2021-06-14
drawing to reduce material waste; discuss with the construction team for many times, select the best method for construction, compile installation and welding operation instructions, clarify the welding operation procedures and quality requirements
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J Gastroenterology H: The effect of tranexamic acid on patients with colonic diverticulum bleeding
Time of Update: 2021-06-10
Figure: The effect of tranexamic acid on various complications The researchers finally said: Although TXA has no significant correlation with lower hospital mortality, it may reduce severe bleeding, blood transfusion, hospitalization time and hospitalization costs.
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JCO: Arsenic combined with all-trans retinoic acid can safely and effectively treat Chinese APL pediatric patients!
Time of Update: 2021-06-10
With the application of all-trans retinoic acid (ATRA) combined with chemotherapy or arsenic trioxide (ATO), APL has become a curable disease , with a complete remission rate of 90-100% in clinical trials.
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the hyaluronic acid that wipes the face be imported? (Health Express Train (59th stop))
Time of Update: 2021-06-10
Resource food or new food raw materials not only enrich the food content and meet the health needs of the general public at different levels, but also promote the rapid development of the industry.
