Question

You need to prepare 100.0 mL of a pH=4.00 buffer solution using 0.100 M benzoic acid...

You need to prepare 100.0 mL of a pH=4.00 buffer solution using 0.100 M benzoic acid (pKa = 4.20) and 0.180 M sodium benzoate. How much of each solution should be mixed to prepare this buffer?

Homework Answers

Answer #1

total volume = 100 mL = 0.1 L

Let us assume , volume of  sodium benzoate = X

   volume of benzoic acid = 0.1 -X

Hence,

[sodium benzoate ] = molarity x volume in Litres = 0.18 X mol

[benzoic acid ] = molarity x volume in Litres = 0.1 (0.1-X) mol = 0.01 - 0.1 X

pH = pKa + log [sodium benzoate] /[benzoic acid ]

4 = 4.2 + log [ 0.18 X /0.01 - 0.1 X ]

0.18 X /0.01 - 0.1 X = 0.63

0.18 X = 0.0063 - 0.063 X

0.243 X = 0.0063

X = 0.026 L

Therefore,

volume of  sodium benzoate = 0.026 L = 26 mL

volume of benzoic acid = 0.1 -X = 0.1- 0.026 = 0.074 L = 74 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 100.0 mL of a pH=4.00 buffer solution using 0.100 M benzoic acid...
You need to prepare 100.0 mL of a pH=4.00 buffer solution using 0.100 M benzoic acid (pKa = 4.20) and 0.180 M sodium benzoate. How much of each solutionshould be mixed to prepare this buffer? ____ mL of benzoic acid ____ mL sodium benzoate
You need to prepare 100.0 mL of a pH=4.00 buffer solution using 0.100 M benzoic acid...
You need to prepare 100.0 mL of a pH=4.00 buffer solution using 0.100 M benzoic acid (pKa = 4.20) and 0.120 M sodium benzoate. How much of each solution should be mixed to prepare this buffer? ___ ml benzoic acid ___ ml sodium benzoate
You need to prepare 100.0 mL of a pH=4.00 buffer solution using 0.100 M benzoic acid...
You need to prepare 100.0 mL of a pH=4.00 buffer solution using 0.100 M benzoic acid (pKa = 4.20) and 0.200 M sodium benzoate. How much of each solution should be mixed to prepare this buffer?
You need to prepare 100.0 mL of a pH=4.00 buffer solution using 0.100 M benzoic acid...
You need to prepare 100.0 mL of a pH=4.00 buffer solution using 0.100 M benzoic acid (pKa = 4.20) and 0.220 M sodium benzoate. How much of each solution should be mixed to prepare tis solution?
You need to prepare 100.0 mL of a pH=4.00 buffer solution using 0.100 M benzoic acid...
You need to prepare 100.0 mL of a pH=4.00 buffer solution using 0.100 M benzoic acid (pKa = 4.20) and 0.140 M sodium benzoate.
You need to prepare 100 ml of a ph=4 buffer solution using .100M benzoic acid (pka=4.20)...
You need to prepare 100 ml of a ph=4 buffer solution using .100M benzoic acid (pka=4.20) and .240M sodium benzoate. How much of each solution should be mixed to prepare this buffer? Find ml of benzoic acid and ml of sodium benzoate
1.) If a buffer solution is 0.110 M in a weak base (Kb = 5.7 ×...
1.) If a buffer solution is 0.110 M in a weak base (Kb = 5.7 × 10-5) and 0.590 M in its conjugate acid, what is the pH? 2.) You need to prepare 100.0 mL of a pH=4.00 buffer solution using 0.100 M benzoic acid (pKa = 4.20) and 0.240 M sodium benzoate. How much of each solution should be mixed to prepare this buffer? 3.) Calculate the change in pH when 6.00 mL of 0.100 M HCl(aq) is added...
1) What is the pH of 100.0 mL of a 0.100M aqueous solution of benzoic acid...
1) What is the pH of 100.0 mL of a 0.100M aqueous solution of benzoic acid at 25C? 2) What is the pH of 100.0mL of a 0.100M aqueous solution of sodium benzoate at 25C? 3) What is the pH of a mixture of 50.0mL of 0.100M benzoic acid and 50.0mL of 0.100M sodium benzoate at 25C?
common methods to prepare a buffer. Calculate the mass of benzoic acid and sodium benzoate (in...
common methods to prepare a buffer. Calculate the mass of benzoic acid and sodium benzoate (in grams) needed to prepare 250 mL of a 0.1 M buffer at pH = 4.1. (The buffer concentration is defined as the sum of the conjugate acid concentration plus the conjugate base concentration.) The pKa of benzoic acid is 4.2
You will prepare 50.0 mL of a pH = 5.0 acetic acid/sodium acetate buffer solution. You...
You will prepare 50.0 mL of a pH = 5.0 acetic acid/sodium acetate buffer solution. You will use 10.0 mL of 0.100 M acetic acid. You will need to determine the amount of sodium acetate (the conjugate base) to use to prepare the buffer. How do I determine the amount of sodium acetate needed for my buffer?
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT
Active Questions
  • Case 12.1 Determine what variables are categorical (either nominal or ordinal scales), perform the appropriate descriptive...
    asked 56 seconds ago
  • GDebi Enterprises is thinking of building a chemical processing plant to produce 4-hydroxy-3-methoxybenzaldehyde. The firm estimates...
    asked 56 seconds ago
  • Suppose you are picking one number from the set of natural numbers from 97 to 4....
    asked 7 minutes ago
  • What is the wavelength (in meters) of photons with the following energies? Part A.) 136 kJ/mol...
    asked 8 minutes ago
  • In your own words, define nonverbal communication and explain three differences between verbal and nonverbal communication...
    asked 12 minutes ago
  • A new fuel injection system has been engineered for pickup trucks. The new system and the...
    asked 17 minutes ago
  • Robots can be trained to do dangerous, stinky, montonous work that human may not want to...
    asked 19 minutes ago
  • Steam at 250oC and 1 MPa enters a compressor at a steady rate of 2 m3...
    asked 19 minutes ago
  • What is the Cost of Equity? Provide a definition, and suggest least one way that we...
    asked 25 minutes ago
  • The scores of fourth grade students on a mathematics achievement test follow a normal distribution with...
    asked 31 minutes ago
  • The chief cost accountant for Kenner Beverage Co. estimated that total factory overhead cost for the...
    asked 38 minutes ago
  • Activites involve for tunnel boring machine activites involve for tunnel boring machine for pune metro coasting...
    asked 39 minutes ago