Inorganic Chemistry> reasoning.....

1.which of the two La(OH)3 & Lu(oH)3is more basic and why???2.during volumetric estimation of Fe2+or C2O42-, solution of potassium permanganate is acidified using H2SO4,why HCl is not used????

riddhi debnath , 13 Years ago

Grade 12

3 Answers

ruchi yadav

Last Activity: 11 Years ago

Answer

its due to lanthanide contraction.as the size of lanthanide ions decreses frm La3+ to Lu3+ , the covalent character of the hydroxides increases and hence the basic strength decreases.La(OH)3 is most basic and Lu(OH)3 is least basic.

Thank You

Ruchi

Askiitians Faculty

PERUMAL

Last Activity: 11 Years ago

its due to lanthanide contraction.as the size of lanthanide ions decreases frm La3+ to Lu3+ , the covalent character of the hydroxides increases and hence the basic strength decreases.La(OH)3 is most basic and Lu(OH)3 is least basic.

Mohd Talha

Last Activity: 7 Years ago

Since ionic size decrease from La³+to Lu³+ the basic character of hydroxides decreases from La(OH)3 to Lu(OH)3. Thus, La(OH)3 most basic while Lu(OH)3 is least basic.