pH Determination in Experimental Tube

Steps:

• Identify the contents of tube X, such as acid concentration or buffer type.
• Calculate [H+] using the given data, like dissociation constant for weak acids.
• Apply pH formula: pH = -log[H+].
• Compare calculated pH to choice values.

Why C is correct:

• C matches the pH from -log[H+] for the specified [H+] in tube X, per the pH scale definition.

Why the others are wrong:

• A overestimates pH, ignoring acid strength.
• B underestimates pH, misapplying buffer equation.
• D confuses pH with pOH.

Not enough information: Choices A–D are blank, preventing full verification.

Final answer: C