1.which of the two La(OH)3 & Lu(oH)3 is 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????

Grade 12Inorganic Chemistry

1.which of the two La(OH)₃& Lu(oH)₃ is more basic and why???

2.during volumetric estimation of Fe²⁺ or C₂O₄^2-, solution of potassium permanganate is acidified using H₂SO₄,why HCl is not used????

3 Answers

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

12 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

8 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.