Question

Ignore activity effects for the following questions: A buffer is prepared by adding 25.00 mL of...

Ignore activity effects for the following questions:

A buffer is prepared by adding 25.00 mL of 0.100 M NaOH to 0.2525 g of benzoic acid, and diluting to 100.0 mL. What is the pH?

Science   Chemistry   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

Mass of benzoic acid =  0.2525 g

Mass of NaOH = 0.100 M

We know molar mass of benzoic acid = 122.12 g / mol

The moles of benzoic acid = 0.2525 / 122.12

= 0.00206

moles of NaOH = 0.100 x 25 / 1000

= 0.0025

after combining both we get ,

moles of acid = 0.00206 - 0.0025

= - 0.02294

moles of salt = 0.0025

[acid] = - 0.02294 / 0.1

= -0.2294M

[salt] = 0.0025 / 0.1

= 0.025 M

We know , pKa of benzoic acid = 4.20

Let us consider ,

pH = pKa + log [salt] / [acid]

pH = 4.20 + log [0.025] / [-0.2294]

pH = 5.16

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
A buffer is prepared by adding 25.00 mL of 0.100 M NaOH to 0.2525 g of...
A buffer is prepared by adding 25.00 mL of 0.100 M NaOH to 0.2525 g of benzoic acid, and diluting to 100.0 mL. What is the pH?
A buffer solution was prepared by adding 4.95 g of sodium acetate to 250 mL of...
A buffer solution was prepared by adding 4.95 g of sodium acetate to 250 mL of 0.15 M acetic acid. What is the pH of 100 mL of this buffer solution if you add 82 mg of NaOH to the solution
A buffer solution is prepared by adding 1.5 g of potassium acetate (FW=98.15 g/mol) to 5.80...
A buffer solution is prepared by adding 1.5 g of potassium acetate (FW=98.15 g/mol) to 5.80 mL of 3.00 M acetic acid. Water was added to bring the total volume to 100.0 mL. The pH of the buffer was then adjusted to a value of pH = 4.50 using 2.00 M HCl. How many mL of HCl were added in order to make this adjustment? PLEASE SHOW WORK
A buffer is prepared by taking 250.0mL of a 0.0865 M acetic acid solution, adding 1.232...
A buffer is prepared by taking 250.0mL of a 0.0865 M acetic acid solution, adding 1.232 grams of potassium hydroxide to the solution, then diluting the solution to 500.00mL. what is the pH of the buffer solution?
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...
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
A buffer is prepared by adding 42.1 mL of 2.4 M NaF to 30.3 mL of...
A buffer is prepared by adding 42.1 mL of 2.4 M NaF to 30.3 mL of 0.18 M HF. What is the pH of the final 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 0.240 M sodium benzoate. How much Benzoic Acid and Sodium Benzoate should be added in mL?
Use the Henderson Hasselbalch equation to calculate the pH of a buffer solution prepared by dissolving...
Use the Henderson Hasselbalch equation to calculate the pH of a buffer solution prepared by dissolving 4.200 g of sodium acetate and adding 8.5 mL of 6.0 M acetic acid in enough water to prepare 100.0 mL of solution.        
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT