Question

Describe the preparation of 5 liter 0.3M acetate buffer pH 4.47 from 2M solution of acetic...

Describe the preparation of 5 liter 0.3M acetate buffer pH 4.47 from 2M solution of acetic acid and 2.5M solution of KOH.

Ans. Add 750 mL of acetic acid stock solution + 200 mL KOH stock solution and bring to 5L with water

Science   Chemistry   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

The molar ratio of the buffer components is calculated:

n Salt / n Acid = 10 ^ (pH - pKa) = 10 ^ (4.47 - 4.75) = 0.5

It has:

i) n Salt - 0.5 * n Acid = 0

ii) n Salt + n Acid = M * V = 0.3 M * 5 L = 1.5 mol

System of equations is applied:

n Salt = 0.5 mol

n Acid = 1 mol

The volume of each reagent is calculated:

V acid = n acid * 1000 / M = 1 * 1000/2 M = 500 mL

V KOH = 0.5 * 1000 / 2.5 M = 200 mL

If you liked the answer, please rate it positively, you would help me a lot, thanks.

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
You need to prepare an acetate buffer of pH 6.33 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.
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 5.52 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.
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT