non stoichiometric nacl is yellow

Explanation of Non-Stoichiometric NaCl Being Yellow

Non-stoichiometric NaCl is yellow due to the presence of F-centers, which are formed when excess sodium ions occupy the lattice sites in the crystal structure of NaCl. These F-centers absorb light in the visible spectrum, resulting in the yellow color.

The formation of F-centers in non-stoichiometric NaCl is a result of the presence of excess sodium ions, which disrupt the stoichiometric balance of NaCl. This disruption leads to the creation of color centers that absorb and emit light in the visible spectrum, giving the non-stoichiometric NaCl its characteristic yellow color.

F-centers are formed when excess sodium ions occupy the lattice sites in the crystal structure of NaCl, leading to the absorption of light in the visible spectrum and the resulting yellow color [[SOURCE 1]].