18933-05-6 Usage
Preparation
Manganese(II) hydroxide is obtained as a white precipitate by adding a solution of sodium or potassium hydroxide to a solution of manganese(II) salt, such as manganese(II) chloride:
Mn2+ + 2OHˉ → Mn(OH)2
The white precipitate rapidly turns brownish-pink in air. The reaction does not occur with ammonia in the presence of ammonium salt.
The hydroxide also is found in nature as mineral pyrochroite in the form of white transparent leaflets. The white leaflets turn pink on exposure to air.
Reactions
Manganese(II) hydroxide is a base exhibiting weak amphoteric behavior. It reacts with acids forming the corresponding manganese(II) salt:
Mn(OH)2 + 2KOH → K2Mn(OH)4
The hydroxide is rapidly oxidized in air forming manganese(III) oxide, Mn2O3.
References
Handbook of Inorganic Chemicals
Chemical Properties
white to pink crystal(s); hardness is 2.5 Mohs [HAW93]
Check Digit Verification of cas no
The CAS Registry Mumber 18933-05-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,8,9,3 and 3 respectively; the second part has 2 digits, 0 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 18933-05:
(7*1)+(6*8)+(5*9)+(4*3)+(3*3)+(2*0)+(1*5)=126
126 % 10 = 6
So 18933-05-6 is a valid CAS Registry Number.
18933-05-6Relevant articles and documents
Reactions of Mn with H2O and MnO with H2. Matrix-isolation FTIR and quantum chemical studies
Zhou, Mingfei,Zhang, Luning,Shao, Limin,Wang, Wenning,Fan, Kangnian,Qin, Qizong
, p. 5801 - 5807 (2007/10/03)
The reactions of Mn atoms with water and MnO with H2 have been studied using matrix-isolation FTIR and DFT theoretical calculations. In solid argon, Mn atom reacted with H2O molecule to form the MnOH2 complex spontaneously
