At 25^ C , the dissociation constant of a base, BOH , is 1.0 10⁻¹² . The concentration of hydroxyl ions in 0.01 M aqueous solution of the base would be:

Step-by-step solution

gathered C =0.01 M K _b=1 10⁻¹² at 25^ C BOH B ⁺+ OH ⁻ C 0 0 gathered at eq. C - C C C aligned [ OH ⁻ ] & = C [ OH ⁻ ] & = K _b C = 1 10⁻¹² 10⁻² aligned [ OH ⁻ ]=10⁻⁷ ~mol ~L ⁻¹ Related Theory The activities of the solutes are approximated with molarities. The dissociation constant is an immediate consequence of the law of mass action which describes equilibria in a more general way. The dissociation constant is also sometimes called ionization constant when applied to salts.