A 0050 M Solution of the Weak Acid HA Has [H₃O⁺]

question 78

Multiple Choice

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