Chemistry

Chemistry

Problem

A 0.25 M0.25\,\text{M} aqueous solution of the salt NaA contains the conjugate base A⁻ of the weak acid HA, for which Ka=4.0×10−4K_a = 4.0 \times 10^{-4} at 25 °C. What is the pH of the NaA solution at 25 °C? (Assume that the activity coefficients are 1.) a) 8.408.40 b) 8.908.90 c) 5.105.10 d) 7.007.00

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