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Biology Laboratory Manual, 6/e

Darrell S. Vodopich, Baylor University
Randy Moore, University of Minnesota--Minneapolis

Exercise 4-Solutions, Acids, and Bases

Choose the one answer that best answers the question.


1	What is a solute?
		A)	a mixture of a solid dissolved in a liquid
		B)	a liquid in which a solid is dissolved
		C)	a solid that is dissolved in a liquid
		D)	a chemical that maintains a relatively constant pH


2	What is a solution?
		A)	a mixture of a solid dissolved in a liquid
		B)	a liquid in which a solid is dissolved
		C)	a solid that is dissolved in a liquid
		D)	a chemical that maintains a relatively constant pH


3	What is a solvent ?
		A)	a mixture of a solid dissolved in a liquid
		B)	a liquid in which a solid is dissolved
		C)	a solid that is dissolved in a liquid
		D)	a chemical that maintains a relatively constant pH


4	What is the molecular weight of a chemical expressed in grams?
		A)	solute
		B)	buffer
		C)	mole
		D)	base


5	According to the pH scale in your lab manual, which is substance is the most acidic?
		A)	ammonia
		B)	potatoes
		C)	wine
		D)	blood


6	If a solution has 10-9 MHNO3, then what is the solution's pH?
		A)	19
		B)	12
		C)	10
		D)	9


7	How many grams of NaCl (molecular weight=58.4 g mol-1) would you dissolve in water to make a total volume of 250 mL of solution to produce a 1M solution of NaCl?
		A)	14.6 g
		B)	14,600 g
		C)	0.23 g
		D)	4.28 g


8	How many grams of sucrose (molecular weight=342 g mol-1) would you dissolve in water to make a total volume of 500 mL of solution to produce a 2 M solution of sucrose?
		A)	684 g
		B)	0.342 g
		C)	342 g
		D)	85,500 g


9	How many grams of sucrose (molecular weight=342 g mol-1) would you dissolve in water to make a total volume of 2L of solution to produce a 1.2 mM solution of sucrose?
		A)	820 g
		B)	0.82 g
		C)	205 g
		D)	570 g


10	Which of the following is an indicator that would show if a solution is neutral.
		A)	bromophenol blue
		B)	methyl red
		C)	phenolphthalein
		D)	litmus

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