Question

Chapter 16 Relating pKa and pKb Review I Constants | Periodic Table Ar Learning Goal: To understand the relation between the strength of an acid or a base and its pKa and pKb values. The degree to which a weak acid dissociates in solution is given by its acid-ionization constant, Ka. For the generic weak acid, HA, HA(aq) A (aq) H (aq) and the acid-ionization constant is given by a HA Similarly, the degree to which a weak base reacts with H2O in solution is given by its base-ionization constant, Kb. For the generic weak base, B, B(aq) + H20 (l)-BH + (aq) + OH. (aq) and the base-ionization constant is given by [BH'][OH 1 = p. ashehs ni qubliud fimdu Chapter 16 t Relating pKa and pKb l Review | Constants I Periodic Table Learning Goal: To understand the relation between the strength of an acid or a base and its pKa and pK, values. The degree to which a weak acid dissociates in solution is given by its acid-ionization constant, Ka. For the generic weak acid, HA, HA(a) A (a) H (aq) and the acid-ionization constant is given by HA Similarly, the degree to which a weak base reacts with H2O in solution is given by its base-ionization constant, Kb. For the generic weak base, B, B(aq) + H2o0) BH (aq) +OH (aq) and the base-ionization constant is given by Kb BH OH く) 5018 ? answer numerically.

Answer 1

$HA\rightleftharpoons H^{+}+A^{-}$

0.094 0 0

0.094-x x x

$K_{a}=\frac{[H^{+}][A^{-}]}{[HA]}$

Ka- a-0.094-1

K,=0.0910310リ 、,-0.094-(10-3)

3 Ka-1.075 × 10-

pK,--loqK,--Ioq(1.075 × 10-5)

pKa = 4.968