1. a. In a hospital laboratory, a 10.0 mL sample of gastricjuice obtained several hours after a meal was titrated with 0.1 M NAOH to neutrality; 7.2 mL of NaOH was required. The patient's stomach contained no indigested food or drinks, thus assume no buffers were present. What is the pH of the gastricjuice? b. Lactic acid is produced and buildsup in muscles during intense exercise and causes painful, sore muscles. Whatis the pH of 0.6 mM lactic acid, pKa=3.86? 1 c. What is the pH of a mixture of equal volumes of0.6 mM HCI and 0.4 mM NaOH?

1. a. In a hospital laboratory, a 10.0 mL sample of gastricjuice obtained several hours after a meal was titrated with 0.1 M NAOH to neutrality; 7.2 mL of NaOH was required. The patient's stomach contained no indigested food or drinks, thus assume no buffers were present. What is the pH of the gastricjuice? b. Lactic acid is produced and buildsup in muscles during intense exercise and causes painful, sore muscles. Whatis the pH of 0.6 mM lactic acid, pKa=3.86? 1 c. What is the pH of a mixture of equal volumes of0.6 mM HCI and 0.4 mM NaOH?

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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Is the following solution a buffer? Each solution was prepared by mixing and diluting appropriate quantities of the two solutes to yield the concentrations indicated. 0.10 M NaCN and 0.10 M NaCl a.yesb.no
How does dilution with water affect the pH of a buffer solution?
Ans all of them
2. What is the role of buffer in: a. pH b. buffering capacity c. pka and Henderson and Hasselbach equation
For a buffer containing HF (aq) and NaF (aq), what ratio of ([F ]/ [HF]) is needed to give a buffer of pH 2.35? 0.16 O 1.00 0.45 0.80 O 6.31
16. Which of the following will form a buffer? a. A mixture of HCIO (aq) and HCIO, (aq) b. A mixture of HCN (aq) and KCN (aq) c. A mixture of NaC,H,O, (aq) and KC,H,O, (aq) d. 10 (aq) with slowly added NaOH e, HNO, (aq) with slowly added HCI
11. What effect will addition of excess of HCI have on the pH of a solution of NH3? a. increase the pH b. decrease the pH C. no effect d. cannot tell from information given > Answer and brief explanation: 12. A buffer solution may be a mixture of a. a weak acid and its salt b. a weak base and its salt C. an excess of a weak acid with a strong base d. all of the above > Answer and brief explanation: 13. The ammonium ion would be classified as a Bronsted a. acid b. base > Answer and brief explanation:
1. Explain how a buffer made of hydrofluoric acid (0.20M) and fluoride ion (0.20M) adjusts to a small amount of added NaOH. 2. Calculate the amount of 0.1M NaOH that must be added to destroy the buffer solution from question 1.
Which statement is incorrect? Select one: a. The endpoint is when the indicator changes color. b. The volume of solution in the buret should be recorded when the endpoint is reached. O c. When the indicator changes color and remains, 2 more drops of the solution in the buret should be added. d. Phenolphthalein will go from a colorless solution to a pink solution for the addition of NaOH to an acid solution. e. It is good practice to place the flask over a white background to better observe the color change of the solution. ge Next page Experiment #10 - Molecular étv
7. A solution was made by mixing 50.0 mL of 0.750 M HCN with 25.0 mL of water. What is the pH of this solution? The pka of HCN = 9.31. 8. One of the compounds featured on the TV series "Breaking Bad" was hydrofluoric acid (HF), pKa = 3.14. a) A solution of HF has a pH = 1.77. What was the initial [HF] for this solution in mol L-1? b) What is the equilibrium concentration of F in this solution in mol L-1? c) What is the percent ionization of HF in this solution?
bläs 4 Predict whether each of the following pairs of substances could function as a buffer system in aqueous solution. Explain why? a. HCl and NaCI b. HCN and KCN c. HCI and HCN d. NACN and * KCN
the sodium acetate - acetic acid buffer keep the pH: a. =4.8 b. = 8.9 C. = 1.8 O d. = 7.7