A student is preparing a solution of 0.1 M Tris-Cl (pH 7.0) with 200 mM NaCl. To
ID: 3164565 • Letter: A
Question
A student is preparing a solution of 0.1 M Tris-Cl (pH 7.0) with 200 mM NaCl. To adjust the pH, the student started with concentrated HCl and overshot, reducing the pH to 4.0. To correct this, the student added NaOH until the pH reached 7.0 and then brought the solution to volume. Which of these statements describes the prepared buffer?
The buffer is correctly prepared.
The pH is not accurate because both acid and base were used.
The pH is accurate, but the solution will have excess salt.
The pH is accurate, but the concentration of Tris will be incorrect.
The pH is accurate, but the volume will be too high.
Explanation / Answer
I believe the correct answer to be C)The pH is accurate, but the solution will have excess salt.
as the NAOH and HCL are added in extra amount and they would form salt and water on reacting together.
Feel free to leave a comment down below for any furhter query. Good rating would be appretiated if you find my answer helpful. Thank you.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.