Lactic Acid, CH₃CH(OH)CO₂H, Is a Weak Acid That Dissociates in Water

question 58

Multiple Choice

Lactic acid, CH₃CH(OH) CO₂H, is a weak acid that dissociates in water according to the equation CH₃CH(OH) CO₂H(aq) + H₂O(l)  CH₃CH(OH) CO₂^-(aq) + H₃O⁺(aq) . What species are in the aqueous solution of 0.1 M lactic acid?

• A) CH₃CH(OH)CO₂H only
• B) CH₃CH(OH)CO₂H primarily but some H₃O⁺ and CH₃CH(OH)CO₂^-
• C) H₃O⁺ and CH₃CH(OH)CO₂^- only
• D) H₃O⁺ and CH₃CH(OH)CO₂^- primarily but some CH₃CH(OH)CO₂H

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