Logo
Home Study Material Contact Search
AI Chat FREE
  1. sciences
  2. chemistry
  3. you need to prepare 100.0 ml of a ph=4.00 buffer s

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

Free

80.2K

Verified Solution

Question

Chemistry

You need to prepare 100.0 mL of a pH=4.00 buffer solution using0.100 M benzoic acid (pKa = 4.20) and 0.220 M sodium benzoate. Howmuch of each solution should be mixed to prepare this buffer?

a) mL of benzoic acid

b) mL of sodium benzoate

Answer & Explanation Solved by verified expert
4.0 Ratings (815 Votes)

Let volume of sodium benzoate =x

      volume of benzoic acid      = 100-x

      no of moles of sodium benzoate = molarity * volume

                                                     = 0.22*x

     no of moles of bezoic acid            = molarity * volume

                                                       = 0.1*(100-x)

       PH = PKa +log[sodium benzoate]/[benzoic acid]

       4      = 4.2 + log0.22*x/0.1*(100-x)

       4-4.2   = log0.22*x/0.1*(100-x)

       -0.2     = log0.22*x/0.1*(100-x)

log0.22*x/0.1*(100-x) = -0.2

0.22*x/0.1*(100-x)       = 10-0.2 = 0.63

0.22*x/0.1*(100-x)   = 0.63

0.22*x               = 0.63*0.1(100-x)

                             = 0.063(100-x)

0.22x                    =6.3-0.063x

0.22x-6.3+0.063x =0

0.263x-6.3 =0

   0.263x = 6.3

         x   = 6.3/0.263   = 23.95

volume of benzoic acid   = 23.95ml

volume of benzoate       = 100-x = 100-23.95 = 76.05ml

   

      
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

Q

6 w y y3 3 4

Algebra
Q

the circle defined by x y 4x 1 0 Show Transcribed Text

Geometry
Q

Reizenstein Technologies (RT) has just developed a solar panel capable of generating 200% more electricity than any...

Finance
Q

The null and alternate hypotheses are: H0 : ?1 = ?2 H1 : ?1 ? ?2 A random sample of...

Basic Math
Q

The voltage across a certain inductor is V 18 91 30 0 50 0 135...

Basic Math
Q

Let y = 5x.Find the change in y, ?y when x = 2 and ?x...

Calculus
Q

1 Analyze the following graph of a system of two equations Identify the coordinates of...

Algebra
Q

Comparative income statements of Sub Corporation for the calendar years 2019, 2020, and 2021 are...

Accounting
Q

Exercise 7-8 Computing and Interpreting Activity Rates [LO7-3] The operations vice...

Accounting
Q

The following transactions occurred during December.Dec.2Purchased equipment for $20,480, plus sales taxes of $1,024(paid in...

Accounting
Q

1) What is meant by Factoring of Accounts Receivables? 2) List 3 advantages of Factoring...

Accounting
Q

Just for the Halibut, Inc. designs and manufactures custom made fishing rods. On June 1,...

Accounting