The pH of a sodium acetate-acetic acid buffer is 4.50.

Organic Chemistry 2
Propose the structure of a compound that exhibits the following 1 H NMR data: (a) C5H10O 1.09 d (6H, doublet) 2.12 d (3H, singlet) 2.58 d (1H, septet) (b) C5H12O 0.91 d (3H, triplet) 1.19 d (6H, singlet) 1.50 d (2H, quartet) 2.24 d (1H, singlet) (c) C4H10O 0.90 d (6H, doublet) 1.76 d (1H, multiplet)

Physics for Scientists & Engineers with Modern Physics 4
A 0.620-kg wood block is firmly attached to a very light horizontal spring (k = 180 N/m) as shown in Fig. 8-35. This block-spring system, when compressed 5.0 cm and released, stretches out 2.3 cm beyond the equilibrium position before stopping and turning back. What is the coefficient of kinetic fric

Elementary Statistics: A Step by Step Approach 8th ed. 8
Free-Sample Requests An online coupon service has 13 offers for free samples. How may different requests are possible if a customer must request exactly 3 free samples? How many are possible if the customer may request up to 3 free samples? 286; 378 (count 0)

Human Anatomy & Physiology 9
Which of the following reactions would liberate the most energy? (a) complete oxidation of a molecule of sucrose to \(CO_2\) and water, (b) conversion of a molecule of ADP to ATP, (c) respiration of a molecule of glucose to lactic acid, (d) conversion of a molecule of glucose to carbon dioxide and wa

Principles of Economics 6
The residents of Vegopia spend all of their income on cauliflower, broccoli, and carrots. In 2010, they buy 100 heads of cauliflower for $200, 50 bunches of broccoli for $75, and 500 carrots for $50. In 2011, they buy 75 heads of cauliflower for $225,80 bunches of broccoli for $120, and 500 carrots f

Physics for Scientists and Engineer with Modern Physics 10
In a local bar, a customer slides an empty beer mug down the counter for a refill. The height of the counter is h. The mug slides off the counter and strikes the floor at distance d from the base of the counter. (a) With what velocity did the mug leave the counter? (b) What was the direction of

Foundations in Microbiology 10
Explain what it means to be an obligate intracellular parasite. Name three groups of obligate intracellular parasites.

Introductory Chemistry: A Foundation 9
The percent by mass of nitrogen is 46.7% for a species containing only nitrogen and oxygen. Which of the following could be this species? a. \(\mathrm{N}_{2} \mathrm{O}_{5}\) b. \(\mathrm{N}_{2} \mathrm{O}\) c. \(\mathrm{NO}_{2}\) d. NO e. \(\mathrm{NO}_{3}\)