Question

X** station constant of water at 10 degree celsius is 5.31 into 10 raise to power minus 17 the ionic product of water is

Answer 1

Pure water is a weak electrolyte and it undergo self ionization or auto-protolysis. In this process water molecules splits into  hydrogen ion (H+) and hydroxide ion (OH-).

The equation is shown as:





As we know hydrogen ion is very reactive and it reacts further with water molecules to form hydronium ion(H3O+)





Applying law of mass action at equilibrium, the value of dissociation constant, K comes to

        K = [H+] [OH-]/[H2O]

       or   [H+][OH-] = K[H2O]

Since dissociation takes place to a very small extent, the concentration of undissociated water molecules, [H20], may be regarded as constant. Thus, the product #[H20] gives another constant which is designated as Kw. So,

[H+][OH-] = Kw

The constant, Kw, is termed as ionic product of water.