SOLUBILITY AND ACIDITY PROPERTIES OF TANTALUM AND NIOBIUM HYDROXIDES

Journal Article · Thu Aug 01 04:00:00 EDT 1963 · Zhur Neorgan. Khim.

OSTI ID:4155080

Babko, A K; Lukachina, V V; Nabivanets, B I

Solubility of freshly precipitated tantalum and niobium hydroxides wss studied at STAH+! from 1 x 10/sup -11/ to 8N (nitric acid media). It is shown that the isoelectric region of tantalum is at pH 9 to 2 and niobium at pH 7 to 0. The isoelectric region of tantalum solubility is 8.0 x 10/sup -6/ mole/l. and niobium 1.4 x 10/sup -5 mole/l. Effects of H/sup +/ and OH/sup -/ concentration on solubility of Ta and Nb acids were evaluated. It was revealed that Ta and Nb ion monomers were formed at the initial stages of solubility. Instability constants were calculated for Ta and Nb hydroxides and a diagram of their distribution between various hydrolyzed forms and acid solutions was constructed. (R.V.J.)

• Research Organization: Inst. of General and Inorganic Chemistry, Academy of Sciences, Ukrainian SSR
• NSA Number: NSA-18-001695
• OSTI ID: 4155080
• Journal Information: Zhur Neorgan. Khim., Journal Name: Zhur Neorgan. Khim. Vol. Vol: 8
• Country of Publication: Country unknown/Code not available
• Language: Russian

Related Subjects

ACIDITY
CHEMISTRY
DIAGRAMS
DISTRIBUTION
NIOBIUM HYDROXIDES
NITRIC ACID
SOLUBILITY
SOLUTIONS
STABILITY
TANTALUM HYDROXIDES