Question

IA 290.0 mL buffer solution is 0.280 M in acetic acid and 0.280 M in sodium...

IA 290.0 mL buffer solution is 0.280 M in acetic acid and 0.280 M in sodium acetate.

What is the initial pH of this solution?

What is the pH after addition of 0.0150 mol of HCl?

What is the pH after addition of 0.0150 mol of NaOH?

Homework Answers

Answer #1

this is a buffer so

pH = pKa + log(Acetate/acetic acid)

since (Acetate/acetic acid) = 1

then

pH = pKa

pKa for acetic acid = 4.75

therefore

pH = 4.75 initially

a)

after adding 0.015 mol of acid

mol of acetic acid initially = MV = (0.28*0.29) = 0.0812

mol of acetate initially = MV =  (0.28*0.29) = 0.0812

after 0.015

mol of acid increases, acetate reacts so decreases

pH = pKa + log(Aacetate/acid)

pH = 4.75 + log ( (0.0812 - 0.015) / (0.0812+0.015) )

pH =4.5876

now...

after addition of NaOH

acetate is formed, since acid is reacting

pH = 4.75 + log ( (0.0812 + 0.015) / (0.0812-0.015) )

pH = 4.912

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
A 300.0 mL buffer solution is 0.240 M in acetic acid and 0.240 M in sodium...
A 300.0 mL buffer solution is 0.240 M in acetic acid and 0.240 M in sodium acetate. Part A What is the initial pH of this solution? Part B What is the pH after addition of 0.0150 mol of HCl? Part C What is the pH after addition of 0.0150 mol of NaOH?
A 280.0 mL buffer solution is 0.240 M in acetic acid and 0.240 M in sodium...
A 280.0 mL buffer solution is 0.240 M in acetic acid and 0.240 M in sodium acetate. Part A What is the initial pH of this solution? Part B What is the pH after addition of 0.0150 mol of HCl? Part C What is the pH after addition of 0.0150 mol of NaOH?
A 230.0 mL buffer solution is 0.200 M in acetic acid and 0.200 M in sodium...
A 230.0 mL buffer solution is 0.200 M in acetic acid and 0.200 M in sodium acetate. What is the pH after addition of 0.0150 mol of HCl?    What is the pH after addition of 0.0150 mol of NaOH?
A 240.0 mL buffer solution is 0.290 M in acetic acid and 0.290 M in sodium...
A 240.0 mL buffer solution is 0.290 M in acetic acid and 0.290 M in sodium acetate. Part A: What is the initial PH of this solution? Part B: What is the PH after addition of 0.0150 mol of HCL?
A 300.0 mL buffer solution is 0.300 M in acetic acid and 0.300 M in sodium...
A 300.0 mL buffer solution is 0.300 M in acetic acid and 0.300 M in sodium acetate.What is the pH after addition of 0.0150 mol of HCl? What is the pH after addition of 0.0150 mol of NaOH?
For 290.0 mL of a buffer solution that is 0.280 M in CH3CH2NH2 and 0.250 M...
For 290.0 mL of a buffer solution that is 0.280 M in CH3CH2NH2 and 0.250 M in CH3CH2NH3Cl, calculate the initial pH and the final pH after adding 0.010 mol of NaOH.
A 1.936 L buffer solution is 0.581 M in acetic acid and 0.581 M in sodium...
A 1.936 L buffer solution is 0.581 M in acetic acid and 0.581 M in sodium acetate. Acetic acid has a pKa of 4.74, making the pH of this solution 4.74. What is the pH after addition of 0.083 mol of HCl?
A 1.0 0Liter buffer solution is .760 M acetic acid and .350 M in sodium acetate....
A 1.0 0Liter buffer solution is .760 M acetic acid and .350 M in sodium acetate. Calculate the pH of the solution after the addition of 100 mL of 0.500 M HCl. The Ka for acetic acid is 1.8 * 10^-5
You have 500.0 mL of a buffer solution containing 0.20 M acetic acid (CH3COOH) and 0.30...
You have 500.0 mL of a buffer solution containing 0.20 M acetic acid (CH3COOH) and 0.30 M sodium acetate (CH3COONa). What will the pH of this solution be after the addition of 20.0 mL of 1.00 M HCl solution? Ka for acetic acid = 1.8 × 10–5
A buffer solution that is 0.10 M sodium acetate and 0.20 M acetic acid is prepared....
A buffer solution that is 0.10 M sodium acetate and 0.20 M acetic acid is prepared. Calculate the initial pH of this solution. The Ka for CH3COOH is 1.8 x 10-5 M. As usual, report pH to 2 decimal places. Calculate the pH when 21.1 mL of 0.014 M HCl is added to 100.0 mL of the above buffer.
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT