Chemistry In Context
9th Edition
ISBN: 9781259638145
Author: Fahlman, Bradley D., Purvis-roberts, Kathleen, Kirk, John S., Bentley, Anne K., Daubenmire, Patrick L., ELLIS, Jamie P., Mury, Michael T., American Chemical Society
Publisher: Mcgraw-hill Education,
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Chapter 12.2, Problem 12.7YT
A practicing scientist must Judge a potential buffer for its utility in mimicking different cellular environments. Consider the list of target pH values and match them to the best possible chemical mixture for creating that pH, see Table 12.1 for a list.
- a. pH 2.5
- b. pH 7.4
- c. pH 6.8
- d. pH 5.4
Table 12.1 Dissociation of Some Weak Acids with Ka and pKa Values
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Part 1)A buffer solution contains 0.125 M acetic acid and 0.150 M sodium acetate. The pKa of acetic acid is 4.74. Use the Henderson-Hasselbalch equation to calculate the solution’s pH.
Part 2)A buffer solution is prepared by mixing 2.00 ml of 0.500 M acetic acid and 10.00 ml of 0.500 M sodium acetate. Calculate the acetic acid concentration in the buffer solution. You will need to use dilution calculations.
If to 100 ml of a solution of CH3COOH with a concentration of 0.0928 N.
a) 200 ml of distilled water was added. Determine its new concentration expressed to 4 decimal places, and determine the pH of the final solution. Data: pKa = 4.756 at 25°C. Consider that degree of dissociation is very small.
b) If it is mixed with 100 ml of a 0.0989 N CH3COONa solution. What is the pH of the buffer solution.
1. A buffer solution is prepared by taking 0.25 moles of acetic acid (pKa = 4.76) and 0.400 moles of barium acetate in sufficient water to make 1.400 liters of solution. Calculate the pH of this solution.
a. 4.25
b. 4.45
c. 5.00
d. 5.27
e. 5.35
2. You have 500.0 mL of a buffer solution containing 0.30M acetic acid and 0.20M sodium acetate. What will be the pH of this solution after the addition of 20.0mL of 1.00M HCl solution? (Ka = 1.8 x 10^ -5).
a. 4.74
b. 5.07
c. 4.00
d. 3.02
e. 4.42
3. 40.0mL of 0.10M HCl was added to 50.0 mL of 0.10M NaOH and the mixture was stirred, then tested with a pH meter. What is its pH at 25.0 C?
a. 1.96
b. 2.00
c. 7.00
d. 11.90
e. 12.05
Chapter 12 Solutions
Chemistry In Context
Ch. 12.1 - Skill Building Finding Equilibrium Glucose and...Ch. 12.1 - Prob. 12.3YTCh. 12.1 - Prob. 12.4YTCh. 12.2 - Prob. 12.5YTCh. 12.2 - Prob. 12.6YTCh. 12.2 - A practicing scientist must Judge a potential...Ch. 12.3 - Prob. 12.8YTCh. 12.3 - Skill Building Checking on Carbon a. Examine the...Ch. 12.3 - Prob. 12.10YTCh. 12.3 - Prob. 12.11YT
Ch. 12.3 - Prob. 12.12YTCh. 12.4 - Prob. 12.13YTCh. 12.4 - Skill Building Functional Groups in Dopamine Draw...Ch. 12.4 - Prob. 12.15YTCh. 12.5 - Prob. 12.16YTCh. 12.5 - Prob. 12.17YTCh. 12.6 - Prob. 12.18YTCh. 12.6 - Prob. 12.19YTCh. 12.6 - The structures of proteins, such as the ones shown...Ch. 12.7 - Reconsider your work in past chapters. List three...Ch. 12.7 - Prob. 12.22YTCh. 12.7 - Prob. 12.23YTCh. 12.8 - Prob. 12.24YTCh. 12.8 - Prob. 12.25YTCh. 12.9 - Skill Building Ester Formation Draw structural...Ch. 12.9 - Prob. 12.27YTCh. 12.9 - You Decide Supersize My Aspirin A friend who...Ch. 12.9 - Modern methods of drug discovery involve...Ch. 12.10 - Make two lists of drugs for each of the two...Ch. 12.10 - See for yourself the shapes of drug molecules by...Ch. 12.10 - Prob. 12.33YTCh. 12.10 - Prob. 12.34YTCh. 12 - Scientific Practices Follow the Hormone Using the...Ch. 12 - The field of chemistry has many sub-disciplines....Ch. 12 - Prob. 2QCh. 12 - Prob. 4QCh. 12 - Nitrous acid (HNO2) has a Ka value of 4.0 10 4,...Ch. 12 - Use the Henderson-Hasselbalch equation and Table...Ch. 12 - Write the structural formula and line-angle...Ch. 12 - Prob. 8QCh. 12 - Prob. 9QCh. 12 - Prob. 10QCh. 12 - Prob. 11QCh. 12 - Prob. 12QCh. 12 - Estradiol is relatively insoluble in water but...Ch. 12 - Prob. 14QCh. 12 - Prob. 15QCh. 12 - Prob. 16QCh. 12 - Define and relate the two terms: hormone and...Ch. 12 - Refer to Figure 11.17. Select two examples of...Ch. 12 - Prob. 19QCh. 12 - Molecules as diverse as cholesterol, sex hormones,...Ch. 12 - Prob. 21QCh. 12 - Prob. 22QCh. 12 - Prob. 23QCh. 12 - Sulfanilamide is the simplest sulfa drug, a type...Ch. 12 - Explain why an equilibrium constant cannot tell...Ch. 12 - Use the information in Table 12.1 to redraw Figure...Ch. 12 - Draw structural formulas for each of these...Ch. 12 - In Your Turn 12.12, you were asked to draw...Ch. 12 - Prob. 29QCh. 12 - Prob. 30QCh. 12 - Prob. 31QCh. 12 - Prob. 32QCh. 12 - Prob. 34QCh. 12 - Prob. 35QCh. 12 - Prob. 36QCh. 12 - Prob. 37QCh. 12 - Prob. 38QCh. 12 - The text states that some racemic mixtures contain...Ch. 12 - Prob. 40QCh. 12 - Prob. 41QCh. 12 - Prob. 44QCh. 12 - Prob. 47QCh. 12 - Prob. 49QCh. 12 - Dorothy Crowfoot Hodgkin first determined the...Ch. 12 - Prob. 52Q
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