Starting with 1.0M acetic acid and 0.50M NaOH, how would you prepare 100ml of 0.10M acetate buffer , pH =4.50? pKa of acetic acid is 4.74
(abbreviations : acetic acid = HAc,Acetate =Ac- )
I don't knw it.
Buh pls m interested In d solution
To prepare a 100 mL of 0.10 M acetate buffer with a pH of 4.50 using acetic acid (HAc) and sodium hydroxide (NaOH), you can follow the steps below:
Step 1: Calculate the amount of acetic acid and sodium acetate needed:
Since you want to prepare a 0.10 M acetate buffer, the concentration of the acetate ion (Ac-) will also be 0.10 M. The molar concentration of both HAc and Ac- in the buffer will be the same because they are in a 1:1 ratio. Therefore, both HAc and Ac- need to be 0.10 M.
First, calculate the moles of HAc required:
moles of HAc = volume of solution (L) * desired concentration (M)
moles of HAc = 0.1 L * 0.10 M = 0.01 moles
Next, calculate the moles of NaOH needed to react with the acetic acid and form the acetate ion:
Since the molar ratio between NaOH and HAc is 1:1, the moles of NaOH will also be 0.01 moles.
Step 2: Calculate the volume of HAc and NaOH solutions needed:
To calculate the volume of each solution required, you need to know their initial concentrations.
Given:
Initial concentration of acetic acid (HAc): 1.0 M
Initial concentration of sodium hydroxide (NaOH): 0.50 M
Using the formula:
moles = concentration * volume (in liters)
The volume of acetic acid solution required:
volume of HAc solution = moles of HAc / initial concentration of HAc
volume of HAc solution = 0.01 moles / 1.0 M = 0.01 L = 10 mL
The volume of sodium hydroxide solution required:
volume of NaOH solution = moles of NaOH / initial concentration of NaOH
volume of NaOH solution = 0.01 moles / 0.50 M = 0.02 L = 20 mL
Step 3: Prepare the acetate buffer solution:
To prepare the buffer solution, you need to mix the calculated volumes of acetic acid (HAc) and sodium hydroxide (NaOH) solutions, and then add distilled water to reach a final volume of 100 mL.
1) Measure 10 mL of the 1.0 M acetic acid (HAc) solution.
2) Measure 20 mL of the 0.50 M sodium hydroxide (NaOH) solution.
3) Mix the two solutions together in a container.
4) Add distilled water to the container until the total volume reaches 100 mL.
Make sure to mix it well to ensure uniform distribution of components.
This will give you a 100 mL of 0.10 M acetate buffer with a pH of 4.50, prepared from 1.0 M acetic acid and 0.50 M sodium hydroxide.