4. The electrical conductivity of deionized water is commonly used as an index of its purity. Explain.

Answer 1

Quite pure water forms only a few ions.
H2O ==> H^+ + OH^-.
(H^+) = (OH^-) = 1 x 10^-7 M which isn;t much. The higher the electrical conductivity the more ions in the water and the less pure it is.