190 ❯ STEP 4. Review the Knowledge You Need to Score High
- A solution with a total chloride ion, Cl-, concen-
tration of 1.0 M is needed. Initially, the solution
is 0.30 M in MgCl 2. How many moles of solid
CaCl 2 must be added to 400 mL of the MgCl 2
solution to achieve the desired concentration of
chloride ion?
(A) 0.10 mole
(B) 0.080 mole
(C) 0.20 mole
(D) 0.15 mole - Assuming the volumes are additive, what is the
final H+(aq) concentration produced by adding
30.0 mL of 0.50 M HNO 3 to 70.0 mL of 1.00 M
HCl?
(A) 0.75 M
(B) 1.50 M
(C) 1.25 M
(D) 0.85 M - To prepare 3.0 L of a 0.20 molar K 3 PO 4 solution
(molecular weight 212 g/mole), a student should
follow which of the following procedures?
(A) The student should weigh 42 g of solute and
add sufficient water to obtain a final volume
of 3.0 L.
(B) The student should weigh 42 g of solute and
add 3.0 kg of water.
(C) The student should weigh 130 g of solute
and add sufficient water to obtain a final
volume of 3.0 L.
(D) The student should weigh 42 g of solute and
add 3.0 L of water. - How many grams of MgSO 4 (molecular weight
120.4 g/mole) are in 100.0 mL of a 5.0 molar
solution?
(A) 600 g
(B) 5.0 g
(C) 12 g
(D) 60.0 g - How many milliliters of concentrated nitric acid
(16.0 molar HNO 3 ) are needed to prepare 0.500 L
of 6.0 molar HNO 3?
(A) 0.19 mL
(B) 250 mL
(C) 375 mL
(D) 190 mL
10. A solution has 10 g of urea in 100 g of solution.
Which of the following are needed to calculate
the molarity of this solution?
(A) the density of the solution and the molecular
weight of urea
(B) the density of urea and the molecular weight
of urea
(C) the density of the solvent and the density of
the solute
(D) the molecular weight of urea and the density
of the solvent
11. Which of the following aqueous solutions would
have the greatest conductivity?
(A) 0.2 M NaOH
(B) 0.2 M RbCl
(C) 0.2 M K 3 PO 4
(D) 0.2 M HNO 2
12. How many milliliters of water must be added to
50.0 mL of 10.0 M HNO 3 to prepare 4.00 M
HNO 3 , assuming that the volumes of nitric acid
and water are additive?
(A) 50.0 mL
(B) 125 mL
(C) 500 mL
(D) 75.0 mL
13. The best method to isolate pure MgSO 4 from an
aqueous solution of MgSO 4 is to:
(A) evaporate the solution to dryness
(B) titrate the solution
(C) electrolyze the solution
(D) use paper chromatography
14. Pick the conditions that would yield the highest
concentration of N 2 (g) in water.
(A) partial pressure of N 2 = 1.0 atm; temperature
of water = 25 °C
(B) partial pressure of N 2 = 0.50 atm; tempera-
ture of water = 55 °C
(C) partial pressure of N 2 = 2.0 atm; temperature
of water = 25 °C
(D) partial pressure of N 2 = 2.0 atm; temperature
of water = 85 °C