Question

You need to prepare an acetate buffer of pH 6.08 from a 0.812 M acetic acid...

You need to prepare an acetate buffer of pH 6.08 from a 0.812 M acetic acid solution and a 2.07 M KOH solution. If you have 925 mL of the acetic acid solution, how many milliliters of the KOH solution do you need to add to make a bufer of pH 6.08? The pKa of acetic acid is 4.76.

Homework Answers

Answer #1

apply buffer equation

pH = pKa + log(A-/HA)

substitute known values

6.08 = 4.76 + log(A-/HA)

A-/HA = 10^(6.08 -4.76) = 20.892

A-. = 20.892*HA

so...

initial mmol of acid = MV = 0.812*925 = 751.1 mmol of acid

after adding mmol of base:

mmol of base = MV = 2.07*Vbase

then

acid left = 751.1 - 2.07*Vbase

conjugate formed = 2.07*Vbase

so...

relate

A-. = 20.892*HA

2.07*Vbase = (20.892)*(751.1 - 2.07*Vbase)

2.07/20.892*Vbase = 751.1 - 2.07*Vbase

(2.07/20.892 + 2.07) * Vbase = 751.1

Vbas = 751.1 / (2.07/20.892 + 2.07) = 346.27 mL of NaOH required

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
You need to prepare an acetate buffer of pH 5.64 from a 0.747 M acetic acid...
You need to prepare an acetate buffer of pH 5.64 from a 0.747 M acetic acid solution and a 2.86 M KOH solution. If you have 475 mL of the acetic acid solution, how many milliliters of the KOH solution do you need to add to make a bufer of pH 5.64? The pKa of acetic acid is 4.76.
You need to prepare an acetate buffer of pH 5.80 from a 0.869 M acetic acid...
You need to prepare an acetate buffer of pH 5.80 from a 0.869 M acetic acid solution and a 2.06 M KOH solution. If you have 475 mL of the acetic acid solution, how many milliliters of the KOH solution do you need to add to make a bufer of pH 5.80? The pKa of acetic acid is 4.76.
You need to prepare an acetate buffer of pH 5.79 from a 0.645 M acetic acid...
You need to prepare an acetate buffer of pH 5.79 from a 0.645 M acetic acid solution and a 2.53 M KOH solution. If you have 625 mL of the acetic acid solution, how many milliliters of the KOH solution do you need to add to make a bufer of pH 5.79? The pKa of acetic acid is 4.76.
You need to prepare an acetate buffer of pH 5.52 from a 0.884 M acetic acid...
You need to prepare an acetate buffer of pH 5.52 from a 0.884 M acetic acid solution and a 2.70 M KOH solution. If you have 575 mL of the acetic acid solution, how many milliliters of the KOH solution do you need to add to make a bufer of pH 5.52? The pKa of acetic acid is 4.76.
You need to prepare an acetate buffer of pH 5.72 from a 0.876 M acetic acid...
You need to prepare an acetate buffer of pH 5.72 from a 0.876 M acetic acid solution and a 2.80 M KOH solution. If you have 625 mL of the acetic acid solution, how many milliliters of the KOH solution do you need to add to make a bufer of pH 5.72? The pKa of acetic acid is 4.76.
You need to prepare an acetate buffer of pH 6.33 from a 0.727 M acetic acid...
You need to prepare an acetate buffer of pH 6.33 from a 0.727 M acetic acid solution and a 2.16 M KOH solution. If you have 475 mL of the acetic acid solution, how many milliliters of the KOH solution do you need to add to make a buffer of pH 6.33? The pKa of acetic acid is 4.76.
You need to prepare an acetate buffer of pH 5.53 from a 0.842 M acetic acid...
You need to prepare an acetate buffer of pH 5.53 from a 0.842 M acetic acid solution and a 2.60 M KOH solution. If you have 975 mL of the acetic acid solution, how many milliliters of the KOH solution do you need to add to make a buffer of pH 5.53? The pKa of acetic acid is 4.76.
You need to prepare an acetate buffer of pH 6.50 from a 0.644 M acetic acid...
You need to prepare an acetate buffer of pH 6.50 from a 0.644 M acetic acid solution and a 2.75 M KOH solution. If you have 575 mL of the acetic acid solution, how many milliliters of the KOH solution do you need to add to make a buffer of pH 6.50? The pKa of acetic acid is 4.76.
You need to prepare an acetate buffer of pH 6.36 from a 0.714 M acetic acid...
You need to prepare an acetate buffer of pH 6.36 from a 0.714 M acetic acid solution and a 2.69 M KOH solution. If you have 475 mL of the acetic acid solution, how many milliliters of the KOH solution do you need to add to make a buffer of pH 6.36? The pKa of acetic acid is 4.76.
You need to prepare an acetate buffer of pH 6.37 from a 0.667 M acetic acid...
You need to prepare an acetate buffer of pH 6.37 from a 0.667 M acetic acid solution and a 2.84 M KOH solution. If you have 675 mL of the acetic acid solution, how many milliliters of the KOH solution do you need to add to make a buffer of pH 6.37? The pKa of acetic acid is 4.76.