medium · Enhanced ACT science
A researcher measures the pH of a solution after adding increments of a base:
| Base Added (mL) | pH Level |
| :--- | :--- |
| 0 | 3.0 |
| 5 | 3.5 |
| 10 | 4.2 |
| 15 | 6.8 |
Which of the following is true about the rate of pH change between 0 and 15 mL?
- The pH will eventually level off near exactly 7.0 no matter how much base is added.
- The rate of change increases as more base is added, indicating a non-linear relationship.
- The pH is directly proportional to the total amount of base added to the solution.
- The pH level increases by a constant 1.27 units for every 5 mL increment of base added overall.
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