1
answer
0
watching
89
views
11 Nov 2019
1. Your boss is studying a pepsin homolog present in fruit and asks you to make 1.00 Lof a 0.100 M acetate buffer at pH 4.25. You have powdered sodium acetate and glacial (melting point 17 C) acetic acid (also distilled water and all the usual lab equipment) available. When finalizing your answer, think about how best to measure the various components of the buffer. Note that the pKa of acetic acid is 4.79 a. What do you mix in what quantity to make the buffer? (5 pts) b. Upon adding 0.010 millimoles of a strong acid to a 1.0 ml sample of your buffer, what is the new pH? (3 pts) For comparison, what is the pH of a 0.010 M aqueous solution of acetic acid? Of 0.010 M perchloric acid (a strong acid)? (3 pts) c.
1. Your boss is studying a pepsin homolog present in fruit and asks you to make 1.00 Lof a 0.100 M acetate buffer at pH 4.25. You have powdered sodium acetate and glacial (melting point 17 C) acetic acid (also distilled water and all the usual lab equipment) available. When finalizing your answer, think about how best to measure the various components of the buffer. Note that the pKa of acetic acid is 4.79 a. What do you mix in what quantity to make the buffer? (5 pts) b. Upon adding 0.010 millimoles of a strong acid to a 1.0 ml sample of your buffer, what is the new pH? (3 pts) For comparison, what is the pH of a 0.010 M aqueous solution of acetic acid? Of 0.010 M perchloric acid (a strong acid)? (3 pts) c.
Nestor RutherfordLv2
16 May 2019