Answer to Question #71388 in General Chemistry for Khumbar debbarma

Question

Which of these two Cacl2 or NaCl will produce Schottky defect if added to AgCl and why?

Answer 1

Schottky defect is a flaw in a crystal lattice which linked with a lattice vacancy defect formation. In following case, the Schottky defect forms when CaCl2 adding to AgCl. Mixing of those two compounds leads to process when each added ion of Ca2+ replaces Ag+ ion as they have resembling radii. The differences in the ions charge (+2 and +1 for Ca and Ag respectively) leads to formation of vacancies in the AgCl lattice.
In case with NaCl one can note that Na and Ag have also similar radii and the same ionic charge, that is why the Schottky defect will not be observed.
Answer: CaCl2