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The constants Ka and Kb are related as shown in Equation 16.5.10. The pKa and pKb for an acid and its conjugate base are related as shown in Equation 16.5.15 and Equation 16.5.16.

The larger the Kb, the stronger the base and the higher the OH − concentration at equilibrium. The values of Kb for a number of common weak bases are given in Table 16.5.2.

Aqueous ammonia (NH3) is a weak basic solution. pH of NH3 solution is calculated by using Kb value of NH3. Online calculator can be used to check your pH values.

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