Question

1.) Which of the following can be used to make a buffer?

	potassium hydroxide and acetic acid
	hydrochloric acid and sodium hydroxide

	sodium chloride and water
	ammonia and ammonium nitrate

2.) Upon dilution of a strong acid, the pH of the solution will:

	increase
	decrease

stay the same

3.) The pH of a buffer is: (select all correct answers)

	depends on the pKa of the acid
	always 7

depends on the ratio of base to acid

4. ) What is the pH of an acetic acid/acetate buffer that contains 0.400 M acetic acid (pKa = 4.75) and 0.100 M acetate? Report just the numerical answer with two digits past the decimal point. Do not include pH = or anything other than the number.

	0.75
	4.15

	8.75
	5.35

5.) Will a solution of NaCN be acidic, basic or neutral?

	neutral
	acidic

basic

6.) Will a solution of KCl be acidic, basic or neutral?

	basic
	neutral

acidic

7.) Will a solution of Ba(NO₃)₂ be acidic, basic or neutral?

	neutral
	acidic basic