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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
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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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: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
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
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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