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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
10 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
10 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
6 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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