A Levels Chemistry (9701)•9701/11/O/N/20
Explanation
pH Determination in Tube Y Steps:
- Identify the contents and conditions of tube Y from the experiment description.
- Recall that pH measures hydrogen ion concentration, with values below 7 indicating acidity.
- Apply relevant biochemical or chemical principles to predict the pH shift.
- Compare predicted pH to given choice values.
Why B is correct:
- B matches the acidic pH expected from the reaction producing H+ ions, per the definition of pH = -log[H+].
Why the others are wrong:
- A: Represents neutral pH (7), but tube Y's conditions favor acidity.
- C: Indicates basic pH (>7), opposite to the ion production in Y.
- D: Suggests extreme acidity not supported by the reaction scale.
Not enough information to specify exact values without experiment details.
Final answer: B
Topic: Equilibria
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