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    Exam 18: Acid-Base Equilibria
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    A 0050 M Solution of the Weak Acid HA Has [H<sub>3</sub>O<sup>+</sup>]
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A 0050 M Solution of the Weak Acid HA Has [H3O+]

Question 78

Question 78

Multiple Choice

A 0.050 M solution of the weak acid HA has [H3O+] = 3.77 * 10¯4 M. What is the Ka for the acid?


A) 7.5 * 10¯3 M
B) 2.8 *10¯6 M
C) 7.0 * 10¯7 M
D) 7.0 * 10¯8 M
E) 2.6 *10¯11 M

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