A Student Titrates an Unknown Weak Acid, HA, to a Pale

question 134

Multiple Choice

A student titrates an unknown weak acid, HA, to a pale pink phenolphthalein endpoint with 25.0 mL of 0.100 M NaOH. The student then adds 13.0 mL of 0.100 M HCl. The pH of the resulting solution is 4.7. Which of the following statements is true?

• A) At pH 4.7, half of the conjugate base, A^-, has been converted to HA.
• B) The pK_a of the acid is 4.7.
• C) The pK_a of the acid is less than 4.7.
• D) The pK_a of the acid is greater than 4.7.
• E) More than one of the above statements are correct.

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