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

question 63

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