C/P Section Bank, Q44 - don't understand equivalence point

[mariposas905]

I'm having trouble understanding how the graphs show a 1:1 mole ratio...I don't get this concept. Would really appreciate any clarification!

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[pretty_positron]

Equivalence point is in the middle of the steep part of the curve which lines up with the 1 molar ratio on the x-axis.

 

[sapientnarwhal]

Equivalence point in MCATspeak is the point at which moles of titrant (substance added) = moles of analyte (substance that titrant reacts with). As the above commenter mentioned, the eq point is at or near the inflection point of the curve.