Asked by ny
A weak base is added to water. Which information is required to find the strength of its conjugate acid?
the value of Kb and the concentration of the weak base
the value of Kw only
the values of Kb and Kw
the values of and Kw and the concentration of the weak base
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The values of Kb and Kw.
Reason: for a conjugate acid–base pair Ka · Kb = Kw, so Ka = Kw / Kb. The concentration of the base does not affect the intrinsic Ka of its conjugate acid (only the equilibrium composition). Note: Kw depends on temperature (1.0×10−14 at 25 °C).
Reason: for a conjugate acid–base pair Ka · Kb = Kw, so Ka = Kw / Kb. The concentration of the base does not affect the intrinsic Ka of its conjugate acid (only the equilibrium composition). Note: Kw depends on temperature (1.0×10−14 at 25 °C).
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