How many moles of hydroxide ions are there in 25 mL of 0.010M solution of Ba(OH)2?
a. 7.5 x 10-1 mol
b. 5.0 x 10-1 mol
c. 2.5 x 10-1 mol
d. 5.0 x 10-4 mol
e. 2.5 x 10-4 mol - d. 5.0 x 10-4 mol
What is the molarity of a solution that contains 46 grams of Na2SO4 (Mw = 142 g/mol) dissolved in
enough water to make 750 mL of solution?
a. 2.3M
b. 0.60M
c. 0.52M
d. 0.43M
e. 0.19M - d. 0.43M
Imagine that you go into the lab and measure 35 mL of a 0.60M stock solution. You pour the 35 mL of
stock solution into a beaker and dilute the solution by adding another 35 mL of water. What is the
molarity of the new solution?
a. 1.2M
b. 0.60M
c. 0.30M
d. 0.15M
e. 0.040M - c. 0.30M
What is the correct expression for the equilibrium constant, K, for the following reaction?
P4(s) + 5O2(g) ⇌ P4O10(s) - K= 1/[O2]^5
,If for a certain gas phase reaction mixture Q = 1, what can you say about the reaction?
a. The reaction will proceed towards the product to achieve equilibrium.
b. The equilibrium position will be determined by the value of K.
c. The reaction will proceed to the left to achieve equilibrium.
d. The reaction is already at equilibrium.
e. The reaction will go to completion. - b. The equilibrium position will be determined by the value of K.
If we increase the volume of the container, then the equilibrium will _______ and the partial pressure of
X2(g) will ____________.
a. Shift to the left, decrease
b. Shift to the left, increase
c. Shift to the right, decrease
d. Shift to the right, increase
e. Not shift, not change - a. Shift to the left, decrease
If you decrease the temperature of this reaction the equilibrium will shift to the________ and the value
of K will __________.
a. right, not change
b. right, decrease
c. right, increase
d. left, decrease
e. left, increase - c. right, increase
Which of the following combinations represent a weak acid and weak base conjugate pair?
a. HCl and NaCl
b. KH2PO4 and Na3PO4
c. CH3COOH and KCH3COO
d. both choice b and choice c
e. choice a, choice b and choice c - c. CH3COOH and KCH3COO
, What is the pH of 0.050M HClO4?
a. 0.90
b. 1.3
c. 3.0
d. 7.0
e. 12.7 - b. 1.3
What is the pH of 0.080M NH3?
a. 1.1
b. 2.9
c. 8.8
d. 11.1
e. 12.9 - d. 11.1
Which of the following three salts would be basic if dissolved in water?
I. KNO2 II. NH4Cl III. Zn(NO3)2
a. I only
b. II only
c. III only
d. I and II only
e. all three - a. I only
What is the pH of 0.80M KHCO3?
a. 3.2
b. 5.2
c. 8.3
d. 8.8
e. 10.8 - c. 8.3
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