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AP Chemistry
4.8 Introduction to Acid-Base Reactions
4.6 Introduction to Titration
4.3 Representations of Reactions
4.2 Net Ionic Equations
IntermediateMCQDrawing RepresentationsConceptual14.4k
A single square box represents a microscopic cross-section of the titration solution with a legend placed directly above it. The legend defines three symbols: an open white circle with a black border represents \(\text{H}^+\text{(aq)}\); a solid gray circle represents \(\text{Na}^+\text{(aq)}\); and a solid black circle represents \(\text{Cl}^-\text{(aq)}\). Inside the square container, there are exactly 12 total particles distributed uniformly: exactly 6 solid black circles (\(\text{Cl}^-\)), exactly 3 solid gray circles (\(\text{Na}^+\)), and exactly 3 open white circles (\(\text{H}^+\)). The particles are dispersed without overlapping or forming clusters. No solvent water molecules, hydroxide ions, bonds, charges inside the circles, or additional text annotations appear inside or outside the box.
Particulate representation of the titration solution after addition of \(\text{NaOH(aq)}\) titrant.
A student titrates a \(25.0 \text{ mL}\) sample of \(0.100 \text{ M } \text{HCl(aq)}\) with \(0.100 \text{ M } \text{NaOH(aq)}\). The initial \(25.0 \text{ mL}\) sample of \(\text{HCl(aq)}\) is represented at the particulate level by a sample containing \(6\) \(\text{H}^+\text{(aq)}\) ions and \(6\) \(\text{Cl}^-\text{(aq)}\) ions. The diagram below represents a representative microscopic volume of the solution after the addition of a certain volume of the \(\text{NaOH(aq)}\) titrant. (Water molecules are omitted for clarity.)

Based on the particulate model, which of the following correctly identifies the volume of \(0.100 \text{ M } \text{NaOH(aq)}\) added to the flask and explains why the count of \(\text{Cl}^-\text{(aq)}\) ions is unchanged?

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