2. Determine how many ml. of solution A (acetic acid-indicator solution) must be added to solution B (sodium acetate-indicator solution) to obtain a buffer solution that is equimolar (equal molar concentration) in acetate and acetic acid. You will need to refer to the Experi- mental Procedure, particularly the section on calculations, to answer this question. Show all calculations. a. Calculate moles Ac in solution B. mol Ac b. Calculate the molarity of HAC in solution A. M HAC c. Calculate volume of solution A needed when the moles of Ac equals moles of HAC. mL soln A
2. Determine how many ml. of solution A (acetic acid-indicator solution) must be added to solution B (sodium acetate-indicator solution) to obtain a buffer solution that is equimolar (equal molar concentration) in acetate and acetic acid. You will need to refer to the Experi- mental Procedure, particularly the section on calculations, to answer this question. Show all calculations. a. Calculate moles Ac in solution B. mol Ac b. Calculate the molarity of HAC in solution A. M HAC c. Calculate volume of solution A needed when the moles of Ac equals moles of HAC. mL soln A
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Transcribed Image Text:2. Determine how many ml. of solution A (acetic acid-indicator solution) must be added to
solution B (sodium acetate-indicator solution) to obtain a buffer solution that is equimolar
(equal molar concentration) in acetate and acetic acid. You will need to refer to the Experi-
mental Procedure, particularly the section on calculations, to answer this question. Show all
calculations.
a. Calculate moles Ac in solution B.
mol Ac
b. Calculate the molarity of HAc in solution A.
M HAC
c. Calculate volume of solution A needed when the moles of Ac equals moles of HAC.
mL soln A
3. K is approximately 2 x 10 under your experimental conditions. Use Equation (5) to
estimate the pH after the first addition of 1 mL of solution A. Show all calculations.
a. Calculate pK,
-pk
b. Calculate moles HAc in the 1 ml of solution A added to solution B.
mol HAC
c. Calculate moles Ac in solution B.
mol Ac
d. Rearrange Equation (5) to solve for pH.
pH
Transcribed Image Text:K, of an Indicator
Name
MT
Base form (In)
Equimolar acid and base
Acid form (Hin)
4
Prelab
1. Complete the following table to estimate the wavelength of bromocresol green under the fol-
lowing conditions.
WAF
Recall that the color of a solution as perceived by your eyes is the complement of the color of
light absorbed by the solution. This means that if an object looks deep blue, it absorbs yellow
light preferentially.
450-490 mm
Color Observed
400-420 m
nm
420-450 mm
deep
blue
light
blue
violet red
green
490-530 m
Complement
Color
630-720 nm
orange
yellow
yellow-
green
530-545 nm
580-630
130 mm
545-580 nm
Wavelength
Absorbed
nm
nm
411
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