Weak acid and base calculations with Ka and Kb

Derive Ka × Kb = Kw for a conjugate pair, calculate the pH of a weak acid or weak base solution from its Ka or Kb (or Ka from pH) using the usual approximations, and convert between Ka, pKa, Kb and pKb.

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The table gives data for four bases at 298 K. Base $K_\mathrm{b}$ p $K_\mathrm{b}$ $\ce{N2H4}$ 5.90 $\ce{C2H5NH2}$ $5.6 \times 10^{-4}$ $\ce{C6H5NH2}$ 9.37 $\ce{C5H5N}$ $1.7 \times 10^{-9}$ Which base has the weakest conjugate acid? A. $\ce{N2H4}$ B.…

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