Metals form basic hydroxides. Which of the following metal hydroxide is the least basic?
(a) Mg(OH)2 (b) Ca(OH)2 (c) Sr(OH)2 (d) Ba(OH)2
Metals form basic hydroxides. Which of the following metal hydroxide is the least basic?
(a) Mg(OH)2 (b) Ca(OH)2 (c) Sr(OH)2 (d) Ba(OH)2
(a)
All the alkaline earth etals from hydroides. Solubility of hydroxides of alkaline earth metals increases from Be to Ba. Be (OH)2andMg(OH)2 are almost insoluble. The basic nature of hydroxides of alkaline earth metal depends on the solubility of hyroxide in water More the solubility more the basicity. Solubility of hydroxides depends on lattice energy and hydration energy.
△Hsolution=△HIattice energy+△Hhydration energy
The magnitude of hydration energy remains almost same whereas lattice enrgy decreases down the group leading to more negative values for △Hsolution down the group.
More negative △Hsolution more is solubility of compounds.
Hence, Be(OH)2 and Mg(OH)2 have less negativ evalues for △Hsolution Hence, least basic.
(a)
All the alkaline earth etals from hydroides. Solubility of hydroxides of alkaline earth metals increases from Be to Ba. Be (OH)2andMg(OH)2 are almost insoluble. The basic nature of hydroxides of alkaline earth metal depends on the solubility of hyroxide in water More the solubility more the basicity. Solubility of hydroxides depends on lattice energy and hydration energy.
△Hsolution=△HIattice energy+△Hhydration energy
The magnitude of hydration energy remains almost same whereas lattice enrgy decreases down the group leading to more negative values for △Hsolution down the group.
More negative △Hsolution more is solubility of compounds.
Hence, Be(OH)2 and Mg(OH)2 have less negativ evalues for △Hsolution Hence, least basic.
