Cas number 131-91-9
Molecular formula C10H7NO2; ONC10H6OH C10H7NO2
Molecular weight 173.17
Alias ​​1-nitroso-2-naphthol (cobalt reagent) 1-Nitroso-2-Naphthol
Brownish yellow needle crystal or powder. Yi Shenghua. Slightly soluble in water, soluble in ethanol, benzene, ether, carbon disulfide, caustic alkali solution, carbon trichloride, carbon tetrachloride and other organic solvents, slightly soluble in cold petroleum ether. The solution is slightly yellow or brown-orange, and produces red or blue complexes with Co3 +, Ru3 +, ZrO2 +, Fe2 +, etc., which are slightly soluble in water, and can be extracted with chloroform or carbon tetrachloride. Melting point: 110.4 ~ 110.8 ℃ The project analysis is pure
(AR)
Appearance Appearance brown powder infrared spectrum identification Infrared spectrometry and control products matching melting point Melting point 104 ° C-108 ° C
Purity≥97.0% (neutralization titration)
Water <0.5%
Hot dilute acetic acid dissolution test Solubility solution transparent burning residue Ignition residue (Sulfate) ≤0.05%
Pass Sensitivity Test
The product is used as a coloring agent for cobalt, palladium and zirconium photometric determination. It is used as a co-precipitating agent for enriching Cr3 +, Co2 +, Fe2 +, UO, and also as an extractant for Ag +, Cd2 +, Co2 +, Cu2 +, Ni2 +, Th4 + and other ions. It is a precipitant for cobalt determination by weighing method. Also used as an organic synthesis intermediate.
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