A 0.186 M solution of the salt NaA has a pH of 8.40.Calculate the K_a value of the acid HA. A)3.4 $\times$ 10^-¹¹ B)7.4 $\times$ 10^-¹⁰ C)2.9 $\times$ 10^-⁴ D)1.2 $\times$ 10² E)none of these

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The Answer of A 0.186 M solution of the salt NaA has a pH of 8.40.Calculate the K_a value of the acid HA. A)3.4 $\times$ 10^-¹¹ B)7.4 $\times$ 10^-¹⁰ C)2.9 $\times$ 10^-⁴ D)1.2 $\times$ 10² E)none of these

A 0186 M Solution of the Salt NaA Has a PH