Self Assessment A


1	What is the conjugate acid of HS^-?
		A)	HS₂
		B)	S^2-
		C)	HS
		D)	H₂S
		E)	SOH


2	What is the H⁺ concentration in a 5.7 x 10^-3 M Ca(OH)₂ solution?
		A)	5.7 x 10^-17 M
		B)	8.77 x 10^-13 M
		C)	8.77 x 10^-11 M
		D)	3.08 x 10^-10 M
		E)	1.75 x 10^-12 M


3	The pH of a certain solution is 4.5. What is the concentration of H⁺(aq) ions in the solution?
		A)	.16 x 10^-5 M
		B)	3.16 x 10⁴ M
		C)	4.5 M
		D)	3.16 x 10^-10 M
		E)	1.9 x 10¹⁹ M


4	The pH of a 0.1 M solution of acid HA is 1.0. Therefore,
		A)	HA is a strong acid.
		B)	K_a of HA is 1.
		C)	K_a of HA is 0.1.
		D)	K_a of HA is 0.01.
		E)	HA must be a weak acid; not enough information is given to determine K_a.


5	The pH of a 0.30 M solution of an acid, HA, has a pH = 5.20. Calculate K_a of HA.
		A)	3.98 x 10^-11
		B)	6.3 x 10^-6
		C)	7.52 x 10^-5
		D)	1.33 x 10^-10
		E)	None of the above.


6	What is the pH of a solution prepared by dissolving 0.250 mol of NH₃ in sufficient water to make 1.00 L of solution (K_b NH₃ = 1.8 x 10^-5)?
		A)	4.50
		B)	2.12
		C)	11.33
		D)	2.67
		E)	None of the above.


7	What is the pH of a 1.0 M solution of NaCN? [K_a HCN = 4.9 x 10^-10]
		A)	2.3
		B)	11.7
		C)	7.0
		D)	4.7
		E)	9.3


8	Calculate the [HS^-] of a 0.33 M solution of H₂S [K_a1 = 5.7 x 10^-8; K_a2 = 1.2 x 10^-15].
		A)	1.37 x 10^-4 M
		B)	1.88 x 10^-8 M
		C)	5.7 x 10^-8 M
		D)	1.2 x 10^-15 M
		E)	7.55 x 10^-5 M


9	Which of the following salts will form an acidic solution when dissolved in water?
		A)	NaCl
		B)	NaNO₂
		C)	NH₄NO₃
		D)	NH₄CN
		E)	B and D


10	Which of the following species can act as a Lewis acid?
		A)	NH₃
		B)	F^-
		C)	H₂O
		D)	NH₄⁺
		E)	BF₃

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