一二三四区视频,亚洲少妇熟女色,日本久热无码视频网,欧美国产日韩大尺度,亚洲a视频,久久少妇一区二区,日韩999无码视频,刺激久久久久久久,啊啊啊啊不要啊在线

??? ??

??? ??
??? ?? ??? ???
?? ??:
17194-00-2
???:
??? ??
???(??):
?????;?????;?????;?? ???????;?? ??;?? ?????????;?? ??????;??? ??;??? ?? (Ba(OH)2);???? ??
???:
Barium hydroxide
???(??):
Ba(OH)2;Anhydrous Barium hydroxide;Aetzbaryt;Chebi:32592;BARIUM HYDRATE;baryta hydrate;Bariumhydroxid;BARIUM HYDROXIDE;bariumdihydroxide;Barium dihydoxide
CBNumber:
CB5118700
???:
BaH2O2
??? ??:
171.34
MOL ??:
17194-00-2.mol
MSDS ??:
SDS

??? ?? ??

???
>300 °C(lit.)
?? ?
decomposes at 1032 (calculated) [KNA91]
??
2.2 g/mL at 25 °C(lit.)
???
?? ???(??), ?(??) ? ???
??? ??
??
??? ??
??? ??
??
???
??
?? ??
??????(pH)
11.27(1 mM solution);12.22(10 mM solution);13.08(100 mM solution)
???
?? ?????.
??
Air Sensitive & Hygroscopic
Merck
14,977
?? ??
ACGIH: TWA 0.5 mg/m3
NIOSH: IDLH 50 mg/m3; TWA 0.5 mg/m3
???
????. ?, ?????, ??? ???? ????.
InChI
1S/Ba.2H2O/h;2*1H2/q+2;;/p-2
InChIKey
RQPZNWPYLFFXCP-UHFFFAOYSA-L
SMILES
O[Ba]O
CAS ??????
17194-00-2(CAS DataBase Reference)
NIST
Barium dihydroxide(17194-00-2)
EPA
Barium hydroxide (Ba(OH)2) (17194-00-2)
??
  • ?? ? ?? ??
  • ?? ? ???? ?? (GHS)
??? ?? C,Xi,Xn
?? ???? ?? 36/37/38-34-20/22-36/38-41-35-22
????? 26-36/37/39-45-36/37
????(UN No.) UN 3262 8/PG 2
WGK ?? 1
RTECS ?? CQ9200000
TSCA TSCA listed
?? ?? 8
???? III
HS ?? 2805191000
???? ??? 8A - Combustible corrosive hazardous materials
Hazard Classifications Acute Tox. 4 Inhalation
Acute Tox. 4 Oral
Eye Dam. 1
Skin Corr. 1
?? ?? ??? 17194-00-2(Hazardous Substances Data)
?? LD50 ipr-mus: 255 mg/kg GTPZAB 28(6),45,84
???? ?? KE-02060
????(GHS): Exclamation Mark (GHS07)
?? ?: Warning
??·?? ??:
?? ??·?? ?? ?? ?? ?? ?? ? ?? ?? P- ??
H302 ??? ??? ?? ?? ?? - ?? ?? 4 ?? P264, P270, P301+P312, P330, P501
H332 ???? ??? ?? ?? ?? ?? ?? 4 ?? P261, P271, P304+P340, P312
??????:
P261 ??·?·??·???·??·...·????? ??? ????.
P264 ?? ??? ?? ??? ????.
P264 ?? ??? ?? ??? ????.
P270 ? ??? ??? ??? ???, ???? ???? ???.
P271 ?? ?? ??? ? ?? ???? ?????.
P301+P312 ??? ???? ??? ????(??)? ??? ????.
P304+P340 ???? ??? ??? ?? ??? ??? ???? ?? ??? ??? ????.
P312 ???? ??? ????(??)? ??? ????.
P330 ?? ?????.
P501 ...? ??? / ??? ?? ???.
NFPA 704
0
3 0

??? ?? C??? ??, ??, ??

??

Barium Hydroxide occurs as an anhydrate whose prismatic, colorless crystals are very deliquescent. Barium hydroxide can be prepared by dissolving barium oxide (BaO) in water:
BaO+ 9H2O→Ba(OH)2·8H2O
It crystallizes as the octahydrate, which converts to the monohydrate upon heating in air. Barium oxide has been found to react with water vapor at temperatures from 1443 to 1593 K to form gaseous Ba(OH)2 according to the reaction:
BaO(solid)+H2O(gas)→Ba(OH)2(gas)
A better method of preparation involves addition of NaOH to the nitrate. Since barium hydroxide is fairly soluble, it is necessary to evaporate the solution to crystallize Ba(OH)2·8H2O. Ethanol is added to aid in this crystallization. The crystals are washed in cold ethanol to remove sodium ions and then dried.

??? ??

Barium hydroxide,Ba(OH)2·8H20, is a white crystalline powder, colorless solid composed of monoclinic crystals. It has a melting point of 78°C and is soluble in water and insoluble in acetone. It is used in the fusion of silicates and fat saponification.

??? ??

Monohydrate, Ba(OH)2H2O is a white powder; density 3.743 g/cm3; slightly soluble in water; soluble in dilute mineral acids. Octahydrate, Ba(OH)28H2O is a colorless monoclinic crystal; density 2.18 g/cm3 at 16°C; refractive index 1.50; melts at 78°C; vapor pressure 227 torr; loses seven molecules of water of crystallization when its solution is boiled in the absence of atmospheric CO2 forming solid monohydrate; further heating produces anhydrous Ba(OH)2 melting at 407°C; readily dissolves in water (3.76 g/100 g at 20°C and 11.7 g/100 g at 50°C); aqueous solution highly alkaline; also soluble in methanol; slightly soluble in ethanol; insoluble in acetone.

??

Barium hydroxide is used in analytical chemistry to titrate weak acids, particularly organic acids. It forms clear aqueous solutions that are free from carbonate, unlike those of the alkali hydroxides, since barium carbonate is insoluble in water. This allows the use of indicators such as phenolphthalein or thymophthalein (with alkaline color changes) without the risk of titration errors due to the presence of weakly basic CO32- ions.Barium hydroxide is used in organic synthesis as a strong base, for example for the hydrolysis of esters and nitriles.It has been used to hydrolyze one of the two equivalent ester groups in dimethyl endecanedioate. It is also used in the preparation of cyclopentanone, diacetone alcohol and d-Gluonic g-lactone.
Barium hydroxide is used as an additive in thermoplastics (such as phenolic resins), rayon and PVC stabilizers to improve plastic properties. This material is used as a general-purpose additive for lubricants and greases. Other industrial applications for barium hydroxide include sugar fabrication, manufacturing soaps, fat saponification, fusing of silicates and chemical synthesis of other barium compounds and organic compounds.
Barium hydroxide is offered for sale both as the octahydrate and the monohydrate. It is available in large quantities commercially.

?? ??

Barium hydroxide is made by dissolving barium oxide in hot water. The octahydrate, Ba(OH)28H2O, crystallizes upon cooling. It also is prepared by precipitation with caustic soda from an aqueous solution of barium sulfide:
BaS + 2NaOH → Ba(OH)2 + Na2S.

???

An acute poison; toxic symptoms are similar to other soluble salts of barium (see Barium).

Safety Profile

A poison by ingestion andintraperitoneal routes. Incompatible with chlorinated rubber.

??? ?? ?? ?? ? ???

???

?? ??


??? ?? ?? ??

???( 346)?? ??
??? ?? ??? ?? ?? ? ??
Hebei Chuanghai Biotechnology Co,.LTD
+86-86-13131129325 +8613131129325
sales1@chuanghaibio.com China 5228 58
Henan Tianfu Chemical Co.,Ltd.
+86-0371-55170693 +86-19937530512
info@tianfuchem.com China 21587 55
Shenyang Simchoice Chemical Co.,Ltd
+86-024-23769576 +86-15040101888
sales@simchoicechem.com China 254 58
CONIER CHEM AND PHARMA LIMITED
+8618523575427
sales@conier.com China 49979 58
career henan chemical co
+86-0371-86658258 +8613203830695
factory@coreychem.com China 29792 58
Hebei Yanxi Chemical Co., Ltd.
+8618531123677
faithe@yan-xi.com China 5853 58
Hubei Ipure Biology Co., Ltd
+8613367258412
ada@ipurechemical.com China 10236 58
Hefei TNJ Chemical Industry Co.,Ltd.
+86-0551-65418671 +8618949823763
sales@tnjchem.com China 34563 58
ANHUI WITOP BIOTECH CO., LTD
+8615255079626
eric@witopchemical.com China 23541 58
AFINE CHEMICALS LIMITED
+86-0571-85134551
sales@afinechem.com China 15075 58

??? ?? ?? ??:

Copyright 2019 ? ChemicalBook. All rights reserved
南溪县| 金山区| 博野县| 宣汉县| 黎城县| 铜川市| 类乌齐县| 大足县| 信阳市| 南靖县| 合阳县| 牡丹江市| 治多县| 高唐县| 海南省| 邵武市| 敦化市| 全南县| 兴和县| 上林县| 昆明市| 丽水市| 静海县| 青岛市| 赤水市| 府谷县| 祁连县| 长治县| 都匀市| 锡林浩特市| 元氏县| 海兴县| 南平市| 林周县| 横山县| 凭祥市| 普宁市| 寻甸| 贺兰县| 弥渡县| 涿鹿县|