The base dissociation constant of ammonia is K_b = 1.8x 10^-5 and K_w = 1.0x 10^-14. What is the hydrolysis constant K_h of NH4+ ?

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The base dissociation constant of ammonia is $K_{b} = 1.8 \times 1 0^{- 5}$ and $K_{w} = 1.0 \times 1 0^{- 14}$ . What is the hydrolysis constant $K_{h}$ of $NH X_{4} X^{+}$ ?

For the conjugate acid of a weak base,

K_{h} = K_{w} / K_{b} = 1 0^{- 14} / (1.8 \times 1 0^{- 5}) = 5.6 \times 1 0^{- 10}