Ferric hydroxide is not an alkali although it is a metallic hydroxide. Why?

answer:

According to low solubility constant of iron (III) hydroxide (6.3 x 10-38) it is not soluble in water (at room or high temperature). Despite of amphoterism of iron (III) hydroxide it does not produce [Fe(OH)4]- ions in alkaline medium as Al(III), Zn(II), Cr(III) and Sn(IV) ions. For this reason Fe(III) belongs to subgroup of the insoluble hydroxides. For more details see at: Svehla, G. Qualitative Inorganic Analysis, 7th ed.; Pearson Education: New Delhi, 2006.

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answer:

The alkali metal hydroxides are the strongest of all bases. The order of basicity increases down the group, i.e., LiOH is the least basic and CsOH, the most basic hydroxide. It is due to the property of bases to donate OH−

ion and due to small size and high lattice enthalpy of Li, it donates less OH−

and large size and low lattice enthalpy of Cs, Cesium hydroxide donates more OH−

ions than any other hydroxide. All the alkali metal hydroxides are white crystalline solids and dissolve freely in water with evolution of much heat.

Explanation:

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