Calculate the pOH of a solution at 25^oC that contains 1 $$ \times $$ 10^$$-$$10 M of hydronium ions, i.e. H₃O⁺.

Which of the following pairs constitutes a buffer?

The hydrogen ion concentration of a 10^$$-$$8 M, HCl aqueous solution at 298 K (K_w = 10^$$-$$14) is

At 25^oC, the dissociation constant of a base, BOH, is 1.0 $$ \times $$ 10^$$-$$12. The concentration of hydroxyl ions in 0.01 M aqueous solution of the base would be