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A 0186 M Solution of the Salt NaA Has a PH

Question 108

Multiple Choice

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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