The equilibrium constants of the following are

N₂ + 3H₂ $$\rightleftharpoons$$ 2NH₃;     K₁

N₂ + O₂ $$\rightleftharpoons$$ 2NO;     K₂

H₂ + $${1 \over 2}$$O₂ $$\rightleftharpoons$$ H₂O;     K₃

The equilibrium constant (K) of the reaction :

2NH₃ + $${5 \over 2}$$ O₂ $$\rightleftharpoons$$ 2NO + 3H₂O will be

A weak acid, HA, has a K_a of 1.00 $$ \times $$ 10^$$-$$5. If 0.100 mol of this acid is dissolved in one litre of water, the percentage of acid dissociated at equilibrium is closest to

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?