Logo
Home Study Material Contact Search
AI Chat FREE
  1. sciences
  2. chemistry
  3. how many grams of sodium acetate should be added i

How many grams of sodium acetate should be added into a two-liters buffer solution already containing...

Free

80.2K

Verified Solution

Question

Chemistry

How many grams of sodium acetate should be added into atwo-liters buffer solution already containing 1 mole of acetic acidso as to prepare the solution with a final pH value of 4.0? The pKaof acetic acid is 4.75.
Furthermore, if you are required to adjust the aforementionedsolution to a new pH value of 5.0, how many grams of NaOH should beadded into the solution?

Answer & Explanation Solved by verified expert
3.6 Ratings (297 Votes)

PH = PKa +log[salt]/[acid]

[CH3COOH] = mole/volume   = 1/2

[CH3COONa[   = moles/2

PH = PKa + log[CH3COONa]/[CH3COOH]

4    = 4.75+ logmole/1

4-4.75   =logmoles/1

-0.75   =logmole/1

moles   = 10-0.75 = 0.1778 moles of CH3COONa

mass of CH3COONa = no of moles* molar mass

                                 = 0.1778*82 = 14.58gm of CH3COONa

By the addition of NaOH

no of moles of CH3COONa =0.1778+x

no of moles of CH3COOH    = 1-x

PH = PKa + log[CH3COONa]/[CH3COOH]

5    = 4.75+ log0.1778+x/1-x

5-4.75 = log0.1778+x/1-x

0.25   = log0.1778+x/1-x

0.1778+x/1-x = 100.25

0.1778+x   = 1.778(1-x)

0.1778+x-1.778+1.778x =0

-1.6002 = -2.778x

x = 0.576 moles

mass of NaOH = 0.576*40 = 23.04gm
Get Answers to Unlimited Questions

Join us to gain access to millions of questions and expert answers. Enjoy exclusive benefits tailored just for you!

Membership Benefits:
  • Unlimited Question Access with detailed Answers
  • Zin AI - 3 Million Words
  • 10 Dall-E 3 Images
  • 20 Plot Generations
  • Conversation with Dialogue Memory
  • No Ads, Ever!
  • Access to Our Best AI Platform: Flex AI - Your personal assistant for all your inquiries!
Become a Member

Other questions asked by students

Physics
1.2K views

Which of the following shapes of SF4 is more stable and why On F S...

Statistics
1.2K views

Outcome Outcome Met/Not Met/In Process Evidence 1.Statistically significant difference between treatment and comparison groups in mathematics grades 3–8 T=3.626 P<3.0533536280097256E-4 2.Statistically...

Biology
1.2K views

Which among the following wars were necessary that established a military tribunal A The Civil...

Biology
1.2K views

The epithelial cells lining the digestive track have what type of junction between them to...

Geometry
1.2K views

Extra Credit Solve completely the triangle with ang a 50 b 100 and a 44

Basic Math
1.2K views

5. ALGEBRA Elaine and Abraham Martz have homes in Florida and Ohio.They realize that they...

Algebra
1.2K views

Macmillan Learning Solve the following equation for x log 3x log 4 x 1 Give...

Accounting
1.2K views

QS C-16 Equity securities with controlling influence LO C2 Accenture purchases 55% of the voting...

Accounting
1.2K views

Columbia Associates declared and paid a cash dividend of $7,500 in the current year. Its...

Accounting
1.2K views

(Prepared from a situation suggested by Professor John W. Hardy.) Lone Star Meat Packers is...

Accounting
1.2K views

Question 19: Foreign Currency Transactions [10 Marks) Suggested Time: You should spend about 30 minutes...

Accounting
1.2K views

When managers make decisions, the decision process used has the following steps in the order...