Pearson eText Human Physiology: An Integrated Approach -- Instant Access (Pearson+)
8th Edition
ISBN: 9780135212905
Author: Dee Silverthorn
Publisher: PEARSON+
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Textbook Question
Chapter 18.1, Problem 8CC
A saline solution is exposed to a mixture of nitrogen gas and hydrogen gas in which PH2 = PN2 What information do you need to predict whether equal amounts of H2 and N2 dissolve in the solution?
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pH expresses the molar concentration of hydronium ions in an
aqueous solution on a logarithmic scale. (Note that it is
common to use the hydrogen ion, H*, to represent the
hydronium ion, H3O+.)
pH = -log[H3O+]
[H3O+] = 10-PH
As pH decreases, acidity increases. As pH increases, acidity
decreases.
• Acidic solution: pH 7
Part A - Calculating pH
Submit
[H₂0+] 1
Acidic
pH 01
10¹ 102 103 104 105 106 107 108 109 10-10 10-11 10-12 10-13 10-14
stomach
acid
3
wine
lemon tomatoes
juice
vinegar,
black
soft drinks, coffee
beer
6
Neutral
urine
milk
7
human
blood
pure
water
sea-
water
baking
soda
10 11 12 13 14
milk
of
magnesia house-
hold
ammonia
oven
cleaner
Basic
household
bleach
Adapted from Biological Science by Freeman ©2008 Pearson Education, Inc.
What is the pH of an aqueous solution with the hydronium ion concentration
[H3O+] = 2 x 10-14 M?
Make sure that your answer has the correct number of significant figures. For help determining the correct number of significant figures, see Hint 3.
►…
Which of the following combinations would be the best choice to buffer the pH of a solution at approximately 7?
Ionization Constants for Aqueous Weak Acids at 25 °C
Acid K. (pK,)
Conjugate Base
Hydrogen phthalate ion,
Cg H4(CO2H)(CO2)
Acetic acid, CH3 CO,H Acetate ion, CH; CO2- 1.8 x 10-5 (4.74)
Weak Acid
Phthalic acid,
C6 H4 (CO,H)2
1.3 x 10-3 (2.89)
Dihydrogen phosphate Hydrogen phosphate
ion, H2 PO4
Hydrogen phosphate
ion, HPO42
6.2 x 10-8 (7.21)
ion, HPO,2-
Phosphate ion, PO,*
3.6 x 10-13 (12.44)
O Na, HPO4 and NagPO4
O NaH2 PO4 and NazHPO4
O H;PO4 and NaH2 PO4
A buffer solution contains an equal concentration of weak acid HX and its conjugate base ion X™.
The ionization constant Ka of HX is 2.2 x 10-8. What is the pH of the buffer?
Chapter 18 Solutions
Pearson eText Human Physiology: An Integrated Approach -- Instant Access (Pearson+)
Ch. 18.1 - Cellular metabolism review: which of the following...Ch. 18.1 - Why doesnt the movement of oxygen from the alveoli...Ch. 18.1 - If nitrogen is 78% of atmospheric air, what is the...Ch. 18.1 - At the summit of Mt. Everest, an altitude of 8850...Ch. 18.1 - Prob. 5CCCh. 18.1 - If alveolar ventilation increases, what happens to...Ch. 18.1 - True or false? Plasma with a PO2 of 40 mm Hg and a...Ch. 18.1 - A saline solution is exposed to a mixture of...Ch. 18.2 - Can a person breathing 100% oxygen at sea level...Ch. 18.2 - What effect does hyperventilation have on the...
Ch. 18.2 - A muscle that is actively contracting may have a...Ch. 18.2 - How would an obstruction of the airways affect...Ch. 18 - List five factors that influence the diffusion of...Ch. 18 - Prob. 2RQCh. 18 - Prob. 3RQCh. 18 - Describe the structure of a hemoglobin molecule....Ch. 18 - Prob. 5RQCh. 18 - Describe the chemoreceptors that influence...Ch. 18 - Describe the protective reflexes of the...Ch. 18 - What causes the exchange of oxygen and carbon...Ch. 18 - List five possible physical changes that could...Ch. 18 - Concept map: Construct a map of gas transport...Ch. 18 - Prob. 11RQCh. 18 - Prob. 12RQCh. 18 - Prob. 13RQCh. 18 - Define hypoxia, COPD, and hypercapnia.Ch. 18 - Why did oxygen-transporting molecules evolve in...Ch. 18 - Draw and label the following graphs: a. the effect...Ch. 18 - Prob. 17RQCh. 18 - Prob. 18RQCh. 18 - Create reflex pathways (stimulus, receptor,...Ch. 18 - Prob. 20RQCh. 18 - Which person carries more oxygen in his blood? a....Ch. 18 - What would happen to each of the following...Ch. 18 - In early research on the control of rhythmic...Ch. 18 - Prob. 24RQCh. 18 - Prob. 25RQCh. 18 - Prob. 26RQCh. 18 - Prob. 27RQCh. 18 - Prob. 28RQCh. 18 - Adolph Fick, the nineteenth-century physiologist...Ch. 18 - Prob. 30RQ
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