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1.which of the two La(OH) 3 & Lu(oH) 3 is more basic and why??? 2.during volumetric estimation of Fe 2+ or C 2 O 4 2- , solution of potassium permanganate is acidified using H 2 SO 4 ,why HCl is not used????

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:12

3 Answers

ruchi yadav
askIITians Faculty 27 Points
9 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
37 Points
9 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
19 Points
5 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.

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