In a fractional composition diagram for a generic weak acid , the exact pH at which the fractional c — Ionic Equilibrium Chemistry Question
Question
In a fractional composition diagram for a generic weak acid $HA$, the exact pH at which the fractional curve of $[HA]$ intersects the fractional curve of $[A^-]$ is:
Answer: B
💡 Solution & Explanation
The intersection point occurs when the fraction of $HA$ equals the fraction of $A^-$, meaning $[HA] = [A^-]$. Based on $K_a = [H^+][A^-]/[HA]$, this simplifies to $[H^+] = K_a$, or $pH = pK_a$.
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