Extraction of f-block element, Chemistry

Q. Extraction of f-block element ?

As all the lanthanides occur together in nature, their extraction involves two main steps: (i)   separation from one another and (ii) reduction of their compounds to metals. Since the lanthanides are all typically trivalent and are almost identical in size, their chemical properties ark almost similar. Thus, the separation of lanthanides from one another is a very difficult task, almost as difficult as the separation of isotopes. Only europium and cerium will be separated from the remaining lanthanides by employing conventional  Q+  chemical methods because of stabilities of Ce 4+and EU2+ in aqueous solution. Cerium can be separated from a mixture of lanthanides by oxidising ce3+ to ce4+ with permanganate or bromate or hypochlorite in an alkaline medium and subsequently precipitating it as Ce02.  Europium can be reduced to EU2+ either by electrolytic reduction with a mercury cathode or by using zinc amalgam. It is then precipitated from the solution as EuSo4.

Earlier the lanthanides used to be separated from each other by selective precipitation or by fractional crystallisation. With a limited amount of a precipitating agent, the substance uhichis least soluble is precipitated first. For example, if a base is added to a solution of  lanthanide nitrates, the least soluble Lu(OH)3 is precipitated first and the most soluble -  La(OH)3 last. As only a partial separation is effected, the precipitate is redissolved and the method is repeated several times.

Posted Date: 7/12/2013 6:41:47 AM | Location : United States






Your posts are moderated
Related Questions

I need organic chemistry exams in pdf form Project Description: Hi, i need someone to get 100 unique organic chemistry exams from US universities and colleges. The needs f


formation of energy bonds in solids are in accordance to? give reasons .

The state of a galvanic cell without liquid junction, when its temperature and pressure are uniform, can be fully described by values of the variables T, p, and ξ. Find an expressi

Distilled water A kettle can be used to give boiling water, which is then condensed in a jam jar fitted with a big cork and immersed in a pan of cold water. Rubber tubing, adhe

alkali metals belong to s-block in the periodic table ,why?

Name the chief ore of silver. Explain with chemical equations the extraction of silver from this ore.

USE THE KINETIC PARTICLE THEORY TO EXPLAIN THE EXISTENCE OF THE DIFFERENT STATES OF MATTER

The series of elements involving the filling of 5f-orbitals is called actinoids series. They follow Ac (89) and include the fourteen elements from Th (90) and Lw (103). The chem