The pKa of lactic acid is 3.86. What is the pH of a buffer in which the lactic acid concentration is 2.0 M and the sodium lactate concentration is 0.50 M?
A) 2.86
B) 3.26
C) 4.46
D) 4.86
B
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An announcement aimed at specific coastal areas that a hurricane poses a possible threat generally within 36 hours is called a:
A) hurricane watch. B) tornado watch. C) tornado warning. D) hurricane warning.
Which type(s) of magma result in erupted material that is mostly in the form of ash?
a. ?rhyolite only b. ?andesite only c. ?basalt only d. ?both andesite and basalt e. ?both basalt and rhyolite
Bottle bills ________
A) have not effectively increased recycling rates in states that have them B) are fees paid by beverage companies in certain states C) have been passed in just over half of the states in the U.S. D) usually involve consumers paying a nickel deposit on a beverage container E) have been passed in all 50 states and Puerto Rico
What parallel was agreed to as the border between North Korea and South Korea?
A) 28th parallel B) 38th parallel C) 48th parallel D) A parallel is not the basis for the border between North Korea and South Korea. E) none of the above