Which of the following solutions has a molarity different from the rest? (w/ solution) A. 6N H3PO4 B. 4N Ca(OH)2 C. 8N HC2H3O2 D. 2N NH4OH?

If each mole of an acid or a base dissociates in aqueous solution to give n mole(s) of H⁺ or OH⁻ ions,
Molarity = (Normality) / n

A.
Each mole of H₃PO₄ dissociates in aqueous solution to give 3 moles of H⁺ ions.
Molarity = 6/3 M = 2 M

B.
Each mole of Ca(OH)₂ dissociates in aqueous solution to give 2 moles of OH⁻ ions.
Molarity = 4/2 M = 2 M

C.
Each mole of HC₂H₃O₂ dissociates in aqueous solution to give 1 mole of H⁺ ions.
Molarity = 8/1 M = 8 M

D.
Each mole of NH₄OH dissociates in aqueous solution to give 1 mole of OH⁻ ions.
Molarity = 2/1 M = 2 M


The answer: C. 8 N HC₂H₃O₂