Self Assessment B


1	In the reaction HCO₃^-(aq) + HPO₄^2-(aq) ----> H₂CO₃(aq) + PO₄^3-(aq), the conjugate acid-base pairs are
		A)	HCO₃^- (acid) and H₂CO₃ (conjugate base); PO₄^3- (base) and HPO₄^2- (conjugate acid)
		B)	HCO₃^- (acid) and PO₄^3- (conjugate base); HPO₄^2- (base) and H₂CO₃ (conjugate acid)
		C)	HCO₃^- (base) and HPO₄^2- (conjugate acid); H₂CO₃ (acid) and PO₄^3- (conjugate base)
		D)	HCO₃^- (base) and H₂CO₃ (conjugate acid); HPO₄^2- (acid) and PO₄^3- (conjugate base)


2	What is the H⁺ concentration in an aqueous solution in which [OH^-] = 1.2 x 10^-5 M? Assume that the solution temperature is 25 ^oC.
		A)	8.3 x 10^-10 M
		B)	1.2 x 10^-19 M
		C)	1.2 x 10^-5 M
		D)	1.0 x 10^-14 M
		E)	None of the above.


3	Calculate the hydroxide ion concentration in a solution with pH = 6.389.
		A)	1.00 x 10^-14 M
		B)	4.08 x 10^-7 M
		C)	9.92 x 10^-7 M
		D)	2.45 x 10^-8 M
		E)	None of the above.


4	What is the pH of 15 mL of 0.0045 M HNO₃?
		A)	4.17
		B)	2.35
		C)	3.35
		D)	5.35
		E)	10.0


5	What is the pH of a 675 mL aqueous solution containing 0.036 mol of NaOH?
		A)	3.41
		B)	10.58
		C)	12.73
		D)	1.27
		E)	13.00


6	What is the pH of a 2.5 x 10^-2 M acetic acid solution? K_a of acetic acid = 1.8 x 10^-5.
		A)	6.35
		B)	3.17
		C)	1.60
		D)	12.7
		E)	None of the above.


7	A 0.10 M solution of an acid, HA, has a pH of 3.0. What is the K_b of the conjugate base, A^-, of this acid?
		A)	1 x 10^-3
		B)	1 x 10^-11
		C)	1 x 10^-9
		D)	1 x 10^-5
		E)	1 x 10^-14


8	Which of the compounds listed below would be the strongest acid?
		A)	F₃COH
		B)	FCH₂OH
		C)	FCH₂SH
		D)	F₃CSH
		E)	CH₃OH


9	Which one of the following salts will form an acidic solution when dissolved in water?
		A)	NaNO₃
		B)	NH₄Cl
		C)	KNO₂
		D)	NaCN
		E)	KClO₂


10	Which of the following species is a basic oxide?
		A)	CO₂
		B)	SiO₂
		C)	GeO₂
		D)	B₂O₃
		E)	Li₂O

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