hard · Enhanced ACT science
A student tested how quickly four unlabeled solutions (W, X, Y, Z) neutralize a fixed amount of acid, recording the volume of base needed to reach pH 7:
| Solution | Concentration (M) | Volume of base to reach pH 7 (mL) |
| :--- | :--- | :--- |
| W | 0.10 | 12 |
| X | 0.20 | 24 |
| Y | 0.10 | 24 |
| Z | 0.20 | 12 |
Which comparison best supports the conclusion that Solution Y is a stronger acid than Solution W (not merely more concentrated)?
- Comparing Y to X, since both required the same volume of base
- Comparing Y to Z, since both required different volumes despite different concentrations
- Comparing Y to W, since they share the same concentration but Y required twice the base
- Comparing W to Z, since they required the same volume of base
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