LUX FLOOD CONCEPT OF ACIDS AND BASES
This concept was proposed by Lux in 1939 and extended by Flood in 1947. They describe acids and bases in terms of oxide ions.
Acids:
According to this concept, an acid is an oxide ion acceptor.
Bases:
According to this concept, a base is an oxide ion donor.
Examples:
In the example below, CaO is a Lux-Flood base and SiO2 is a Lux-Flood acid.
\[CaO\; +\; SiO_{2}\;\rightarrow \; CaSiO_{3}\]
In the example below, PbO is a Lux-Flood base and SO3 is a Lux-Flood acid.
\[PbS\; +\; SO_{3}\;\rightarrow \; PbSO_{4}\]
Note:
- This reaction explains the reaction that occurs at a high temperature. For example the manufacturing of glass.
Amphoteric substance (Lux-Flood Concept):
In Lux-Flood concept amphoteric substance is a substance that shows a tendency to loss and gain oxide ion. For example
\[ZnO\; +\; O^{-2}\;\rightleftharpoons \; ZnO_{2}^{-2}\]
\[ZnO\; -\; O^{-2}\;\rightleftharpoons \; Zn^{+2}\; +\; O^{-2}\]
In the first reaction, ZnO is acid and in the second reaction, ZnO is base.