Question

PLEASE SHOW STEPS CLEARLY You need to prepare an acetate buffer of pH 5.82 from a...

PLEASE SHOW STEPS CLEARLY

You need to prepare an acetate buffer of pH 5.82 from a 0.712 M acetic acid solution and a 2.78 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 5.82? The pKa of acetic acid is 4.76.

Homework Answers

Answer #1

Let volume of KOH be V mL

mol of KOH added = 2.78*V mmol

Before adding KOH

Before Reaction:

mol of CH3COONa = 0 mmol

mol of CH3COOH = 0.712 M *575.0 mL

mol of CH3COOH = 409.4 mmol

2.78*V KOH will react with 2.78*V of CH3COOH to form extra 2.78*V of base

After adding KOH

mol of CH3COOH = 409.4-2.78*V mmol

mol of CH3COONa = 0+2.78*V mmol

use:

pH = pKa + log {[conjugate base]/[acid]}

5.82 = 4.76+log {[CH3COONa]/[CH3COOH]}

log {[CH3COONa]/[CH3COOH]} = 1.06

[CH3COONa]/[CH3COOH] = 11.481536

So,

(2.78*V)/(409.4-2.78*V) = 11.481536

2.78*V = 4700.540926 - 31.918671*V

(2.78+31.918671)*V = 4700.540926-0

V = 135 mL

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 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 6.33 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 6.36 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.
You need to prepare an acetate buffer of pH 6.12 from a 0.755 M acetic acid...
You need to prepare an acetate buffer of pH 6.12 from a 0.755 M acetic acid solution and a 2.43 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 6.12? The pKa of acetic acid is 4.76.
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 5.64 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 2.93 M KOH solution. If you have 775 mL of the acetic acid solution, how many milliliters of the KOH solution do you need to add to make a buffer of pH 5.64? The pKa of acetic acid is 4.76. Already tried 1498.88 and 1499 and they are wrong. Thank you!