HomeworkLib
Question

A buffer solution is prepared by mixing 78.0 mL of 0.279 M fluorobenzoic acid (C7H5O2F) with...

A buffer solution is prepared by mixing 78.0 mL of 0.279 M fluorobenzoic acid (C7H5O2F) with 50.0 mL of 0.476 M sodium fluorobenzoate. The pKa of this weak acid is 2.90. What is the pH of the buffer solution? (with correct sig figs)
WebAssign will check your answer for the correct number of significant figures.  

science   chemistry   
0 0
Add a comment Improve this question Transcribed image text
Next > < Previous
Sort answers by oldest

Homework Answers

Answer #1

Answer

pH = 2.94

Explanation

After mixing the solution

Concentration of C7H5O2F = 0.279M/( 128ml/78ml) = 0.1700M

Concentration of C7H4O2F- = 0.476M/( 128ml/ 50ml) = 0.1859M

Applying Henderson - Hasselbalch equation

pH = pKa + log([A-]/[HA])

pH = pKa + log( [ C7H4O2F-]/[C7H5O2F])

pH = 2.90 + log( 0.1859M/0.1700M)

pH = 2.90 + 0.039

pH = 2.94

0 0
Add a comment
Know the answer?
Add Answer to:
A buffer solution is prepared by mixing 78.0 mL of 0.279 M fluorobenzoic acid (C7H5O2F) with...
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. Our experts will answer your question WITHIN MINUTES for Free.
Similar Homework Help Questions

  • A buffer solution is prepared by mixing 15.0 mL of 2.20 M Acetic Acid and 30.0...

    A buffer solution is prepared by mixing 15.0 mL of 2.20 M Acetic Acid and 30.0 mL of 1.55 M NaC2H3O2. Determine the pH of the buffer. pKa HC2H3O2 = 4.745 pH:_____

  • Calculate the pH of a buffer solution prepared by mixing 75 mL of 1.0 M lactic...

    Calculate the pH of a buffer solution prepared by mixing 75 mL of 1.0 M lactic acid and 25 mL of a 1.0M sodium lactate. (pka of lactic acid = 3.86) Calculate the change in pH that occurs when 0.01moles of OH are added to a 1L buffered solution that contains 0.5M acetic acid (HC_2H_3O_2) and 0.5M acetate ion (C_2H_3O_2). Acetic acid pka = 4.76.

  • What is the pH of a buffer solution prepared by mixing 30.0 mL of 0.10 M...

    What is the pH of a buffer solution prepared by mixing 30.0 mL of 0.10 M of HOAC and 40.0 mL of a 0.1 M NaOAc Pka of the acid is 4.74

  • 1a. A buffer solution is prepared by mixing 15.0 mL of 2.00 M Acetic Acid and...

    1a. A buffer solution is prepared by mixing 15.0 mL of 2.00 M Acetic Acid and 10.0 mL of 1.50 M NaC2H3O2. Determine the pH of the solution after the addition of 0.01 moles NaOH (assume there is no change in volume when the NaOH is added). Ka HC2H3O2 = 1.80E-5 1b. A buffer solution is prepared by mixing 55.0 mL of 1.15 M HF and 99.0 mL of 0.450 M NaF. Determine the pH of the solution after the...

  • 1) Consider a buffer solution that is prepared by mixing 1000 mL of O.500 M NHs with 100.0 mL of0...

    1) Consider a buffer solution that is prepared by mixing 1000 mL of O.500 M NHs with 100.0 mL of0.400 MNH CL Record all answers to at least 3 sig figs and watch out for rounding errors. la) Calculate the pH of this buffer lb) Calculate the pll of this buffer after 200 mg of NaOH is added to the original buffer solution in la. Ic) Calculate the pH of this buffer after 50 mL of0.200 M HCI is added...

  • A buffer is prepared by mixing 115 mL of a 0.120 M solution of the weak...

    A buffer is prepared by mixing 115 mL of a 0.120 M solution of the weak acid HA with 115 mL of a 0.150 M solution of NaA. What will be the pH of the resulting solution?  Ka for HA is 2.30x10-6

  • A buffer solution is prepared by mixing 23.6 mL of 0.398 M sodium dihydrogen citrate with...

    A buffer solution is prepared by mixing 23.6 mL of 0.398 M sodium dihydrogen citrate with 36.6 mL of 0.881 M sodium hydrogen citrate A table of pKa values can be found here 1. Calculate the pH (to two decimal places) of this solution Assume the 5% approximation is valid and that the volumes are additive. Submit Answer Tries 0/3 2. Calculate the pH (to two decimal places) of the buffer solution after the addition of 24.9 mL of a...

  • A buffer is prepared by mixing 113 mL of a 0.120 M solution of the weak...

    A buffer is prepared by mixing 113 mL of a 0.120 M solution of the weak acid HA with 130 mL of a 0.150 M solution of NaA. What will be the pH of the resulting solution? Ka for HA is 2.30x10-6. ** All volumes should have 3 significant figures.

  • Q. A buffer solution prepared by mixing 50.00 mL of 0.200 M acetic acid and 50.00...

    Q. A buffer solution prepared by mixing 50.00 mL of 0.200 M acetic acid and 50.00 mL of 0.200 M sodium acetate (Ka, acetic acid = 1.76 x 10-5). (Hint: Calculate the pH using the Henderson-Hasselbach equation, remember to allow for the dilution effect when mixing the two solutions together.)

  • A buffer solution is prepared by mixing 50.0 mL of 0.300 M NH3(aq) with 50.0 mL...

    A buffer solution is prepared by mixing 50.0 mL of 0.300 M NH3(aq) with 50.0 mL of 0.300 M NH4Cl(aq). The pKb of NH3 is 4.74. Calculate the NH3 concentration in the buffer solution. Calculate the NH4Cl concentration in the buffer solution. Calculate the pH of the buffer solution. 7.50 mL of 0.125 M NaOH is added to the 100.0 mL of the original buffer solution prepared in Question 1. Calculate the new NH3 concentration for the buffer solution. Calculate...

ADVERTISEMENT
Free Homework Help App
Download From Google Play
Scan Your Homework
to Get Instant Free Answers
Need Online Homework Help?
Ask a Question
Get Answers For Free
Most questions answered within 3 hours.
ADVERTISEMENT
ADVERTISEMENT