You need to look up pKa for acetic acid in your text or notes. I used pKa = 4.74.
And is that 3.8 or 3.80? It will make a difference in determining the number of significant figures.
pH = pKa + log[(base)/(acid)]
3.80 = 4.74 + log B/A
Solve for B/A which is equation 1.
Then A + B = 0.1 is equation 2.
Solve these two equation simultaneously for A and B which will give you the mols A and mols B. I assume you can take it from here.
using this method i calculated 1.03 mL, but this was not one of the options
the options were:
a. ) 1.28 mL
b. ) 1.41 mL
c. ) 0.15 mL
d. ) 2.18 mL
Sorry. I didn't correct for the volume.
You want 0.250 L (not a liter) of solution.
So A + B = 0.025
and B/A is the same as before. By the way, when I solved for B/A, I get 0.1136. That's too many s.f. but I carried it through. You can round at the end. I ended up with answer a.
I got 1.028mL instead of 1.28mL.
After finding the concentration of the acid, I multiplied by the molar mass. then, i multiplied by L/1050g to cancel out the g. Finally, I multiplied by 0.250L. Clearly, I'm making this too complicated.
B/A = 0.1136 or
B = 0.1136*A
A + B = 0.025
A + 0.1136A = 0.025
A = 0.025/1.1136 = 0.02245 moles
0.02245*60g/mol = 1.347 grams acetic acid.
1.347/1.05 = 1.282 which rounds to 1.28 mL.
Answer this Question
school - What is the pH of 0.1 M formic acid solution? Ka=1.7„e10-4? What is the...
chemistry - Calculate the volume of 1.00 M acetic acid solution and mass of ...
Chemistry - Calculate the volume of 1.00 M acetic acid solution and mass of ...
Biochemistry - A buffer solution is prepared by mixing 2.50 mL of 2.00M sodium ...
Chemistry 12 - In a lab the task was to dilute a 1.0M sol'n of Acetic Acid to a ...
Chemistry - If you need to prepare 250.0 mL of a pH 5.00 buffer that has a total...
Biochem - You have prepared a 400 mL of a .210 M acetate buffer solution with a ...
CHEMISTRY HELP! - a. According to the Henderson-Hasselbalch equation, how many ...
GEN CHEM - make 200.0 mL of a pH 5.00 buffer from 0.200 M acetic acid and 0.100 ...
Chemistry - A buffer contains 5.00 M acetic acid and 5.00 M acetate anion. ...