A Weak Acid Has Ka = 4

question 25

Multiple Choice

A weak acid has Ka = 4.2 × 10^-3. If [A-] = 2.0 M, what must [HA] be so that [H+] = 2.1 × 10^-3 M?

• A) 1.5 M
• B) 2.0 M
• C) 1.0 M
• D) 0.5 M
• E) 0.25 M

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