Top Posters
Since Sunday
21
A
8
7
w
6
R
5
o
5
A
5
t
5
m
5
t
5
h
5
S
5
New Topic  
Annonn Annonn
wrote...
Posts: 116
Rep: 1 0
2 months ago
Use the Henderson-Hasselbalch equation to perform the following calculations.
The Ka of acetic acid is:  1.8 × 10–5. FW for sodium acetate, trihydrate (NaC2H3O2•3H2O) is 136.08 g/mol.

• Buffer A: Calculate the mass of solid sodium acetate required to mix with 50.0 mL of
0.1 M acetic acid to prepare a pH 4 buffer.

• Buffer B: Calculate the mass of solid sodium acetate required to mix with 50.0 mL of
1.0 M acetic acid to prepare a pH 4 buffer.
Read 98 times
5 Replies
Replies
Answer verified by a subject expert
bio_manbio_man
wrote...
Educator
Top Poster
Posts: 31070
2 months ago
Sign in or Sign up in seconds to unlock everything for free
• Buffer A: Calculate the mass of solid sodium acetate required to mix with 50.0 mL of 0.1 M acetic acid to prepare a pH 4 buffer.



Can you replicate this for (b)?
1

Related Topics

wrote...
2 months ago
So, I tried replicating it for Buffer B, since there is 1.0 M of acetic acid, and all the numbers are the same, wouldn't the answer be 3.321 g?
I noticed Buffer B's answer is similar to Buffer A's answer, but with the decimal moving to the right, once.
wrote...
Educator
2 months ago
I've modified it
Attached file
Thumbnail(s):
You must login or register to gain access to this attachment.
wrote...
2 months ago
Thank you, that's what I got except I added an extra sig fig Slight Smile
wrote...
Educator
2 months ago
Considering significant figures, it should only be 2 sf, thus 3.2 will suffice.
New Topic      
Explore
Post your homework questions and get free online help from our incredible volunteers
  95 People Browsing
 224 Signed Up Today
Related Images
 138
 46
 31