The following plot shows a titration curve for the titration of 1.00 L of 1.00 M diprotic acid H2A+ with NaOH.Which point a-d represents the isoelectric point? 
Definitions:
Depleting Self-Control
The concept that self-control is a finite resource that diminishes with use, leading to decreased ability to resist temptation or persist in challenging tasks.
Adaptation-Level Phenomenon
The tendency of humans to quickly adapt to a new situation or environment, making it the new normal.
Biofeedback
A technique that teaches individuals to control physiological processes such as heart rate, using monitoring devices to provide information on bodily functions.
Internal Locus
Belief that one has control over their life events and outcomes, as opposed to external forces being responsible.
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