Study Guide for Campbell Biology
11th Edition
ISBN: 9780134443775
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece, Martha R. Taylor, Michael A. Pollock
Publisher: PEARSON
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Textbook Question
Chapter 3, Problem 15TYK
What does a buffer do?
- a. moderates pH changes
- b. maintains neutrality
- c. increases solubility
- d. contributes bicarbonate ions
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What is the correct sequence of steps in a usual buffer preparation
before use?
I. Dilute the solution to the mark in a volumetric flask with
distilled water.
II. Dissolve the weighed salts in a small volume of distilled water.
III. Adjust the pH of the solution using a strong acid or base.
IV. Compute and weigh the appropriate amounts of the buffer
components.
V. Shake and mix the contents of the volumetric flask before use.
IV, II, Ш, І, V
о IV, II, ІІ, V, I
O IV, I, III, II, V
IV, II, V, I, III
A small amount of NaOH is added to a weak acid buffer system. Describe what happens in terms of possible reactions and changes in pH.
Which among the following is an example of a pharmaceutically important buffer system?
a. All of the choices
b. Sorensen's buffer
c. Palitzsch's buffer
d. Gifford's buffer
Chapter 3 Solutions
Study Guide for Campbell Biology
Ch. 3 - Draw the four water molecules that can...Ch. 3 - The following concept map is one way to show how...Ch. 3 - Prob. 3IQCh. 3 - Complete the following table to review your...Ch. 3 - Prob. 5IQCh. 3 - a. Add to the formula in Interactive Question 3.5...Ch. 3 - Fill in the following table, which summarizes the...Ch. 3 - To become proficient in the use of the concepts...Ch. 3 - Each water molecule is capable of forming a. three...Ch. 3 - The properties of water make it an ideal and...
Ch. 3 - What accounts for the movement of water up the...Ch. 3 - Climates tend to be moderate near large bodies of...Ch. 3 - You have three flasks containing 100 mL of...Ch. 3 - A burn from steam at 100C is more severe than a...Ch. 3 - Evaporative cooling is a result of a. the release...Ch. 3 - Prob. 8TYKCh. 3 - Prob. 9TYKCh. 3 - Prob. 10TYKCh. 3 - Prob. 11TYKCh. 3 - Prob. 12TYKCh. 3 - Prob. 13TYKCh. 3 - Consider two solutions labeled A and B. Solution A...Ch. 3 - What does a buffer do? a. moderates pH changes b....Ch. 3 - Prob. 16TYKCh. 3 - Prob. 17TYKCh. 3 - Prob. 18TYK
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- Which of the following is FALSE when the concentration of the buffer solution was increased? a. The buffer will be effective in resisting pH changes. b. There will be more weak acid components that can neutralize the added base. c. The solution will have a higher buffer capacity. d. There will be more weak base components that can neutralize the added base.arrow_forwardwhich of the following is a characteristic of a buffer? a. The pH will go down significantly when H3O+ is added to the buffer b. The pH will go down very slightly when H3O+ is added to the buffer c. The pH will go up significantly when H3O+ is added to the bufferarrow_forwardIn the human body,the -log of the hydrogen ion concentration ([H+]) is regulated by a. pH b. Acidity c.Alkalinity d.Bicarbonate ion e. Buffer systemarrow_forward
- Convert the hydrogen ion concentration (moles per liter) of a solution to a pH value and describe how buffers help minimize changes in pH.arrow_forwardExplain how a buffer solution manages to stabilize its pH against the addition of acids and bases?arrow_forwardWhich of the following statements is TRUE? A. Water and electrolytes move across the cell membranes only through protein channels B. Water and electrolytes cannot move across cell membranes C. Water freely moves across cell membranes D. Electrolytes freely move across cell membranesarrow_forward
- Define buffers and Discuss the properties of the biological buffer system. Define buffer capacity What is a buffer solution? Example of a weak base and weak acid What is pH?arrow_forwardDescribe a buffer system in the human body. Why is this important?arrow_forwardA pH of 3 is a. basic b. neutral c. acidicd. a bufferarrow_forward
- Explain why a solution turns slightly acidic when you breathe into it. Explain the role of the buffer in your bloodarrow_forwardThe fluid with the lowest [H+] concentration A. Saliva (pH = 6.40) B. Lung fluid (pH = 7.60) C. Tears (pH = 7.40) D. Urine (pH = 6.80)arrow_forwardExplain the importance of bicarbonate buffer systems in the regulation of pharrow_forward
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