Question

Explaine lux_flood concept of acid and base with example

Answer 1

Lux-Flood concepts for acid and base:

According to this theory, acid and base are defined as acid being an oxide acceptor and the base being an oxide donor.

Example: Calcium oxide(CaO)(CaO)$\left(CaO\right)$ reacts with silicon dioxide$\left(Si{O}_2\right)$ (SiO2)(SiO_2)to form calcium silicate(CaSiO3)(CaSiO_3)$\left(CaSi{O}_3\right)$.

$CaO+Si{O}_2⟶CaSi{O}_3$

In this reaction, $CaO$ is an oxide donor. So, $CaO$ acts as the base while $Si{O}_2$ is an oxide acceptor. So, $Si{O}_2$ acts as an acid.

Merits and demerits:

Merit:

This approach emphasizes the acid and basic-anhydride aspects. Acidic oxides are acid anhydride and in the aqueous medium generate protonic acids, while, basic oxides are basic anhydride and generate hydroxyl ions in the aqueous medium.

Demerit:

• The usefulness of this concept is limited to species that contain oxide ion.
• The concept is applicable only in the molten state of an oxide.