This question-specific review guide is tied to the answer reasoning for a PracticeTestVault item. Use it after you answer the question so the review stays focused on what the prompt actually tested.
What this question is testing
Objective: General Chemistry
Prompt focus: What is the pH of a solution with a hydrogen ion concentration of 1 times 10 to the negative 4 molar?
Why the correct answer works
4
pH equals the negative log of the hydrogen ion concentration, which gives 4.
Why the tempting wrong answer fails
The tempting wrong answer usually loses because it skips the key condition, priority, or evidence in the prompt.
Plain-language takeaway
The pH is the negative base-10 logarithm of the hydrogen ion concentration. The negative logarithm of 1 times 10 to the negative 4 is 4.
Simple analogy
Think of general chemistry like following a short checklist: identify the clue, confirm the rule, and then make the move that fits this exact scenario.
How to review it before a retake
- Underline the command word and name what the question is asking before rereading the choices.
- Compare the correct answer against the closest distractor and write the exact detail that separates them.
- Retest this objective with a fresh question without looking at the rationale first.