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Solutions and Colligative Properties 189
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You have 25 minutes to answer the following questions You will be expected to do your calculations without a calculator You may use the periodic table at the back of the book For each question, circle the letter of your choice 1 A solution is prepared by dissolving 125 g of an unknown substance in 1000 mL of water Which procedure from the following list could be used to determine whether the solute is an electrolyte (A) (B) (C) (D) (E) Measure the specific heat of the solution Measure the volume of the solution Measure the freezing point of the solution Determine the specific heat of the solution Determine the volume of the solute 5 A solution with a total chloride ion, Cl , concentration of 10 M is needed Initially, the solution is 030 M in MgCl2 How many moles of solid CaCl2 must be added to 400 mL of the MgCl2 solution to achieve the desired concentration of chloride ion (A) (B) (C) (D) (E) 010 0080 020 015 016
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+ 2 What is the final K concentration in a solution made by mixing 3000 mL of 10 M KNO3 and 7000 mL of 20 M K3PO4
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(A) (B) (C) (D) (E)
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15 M 50 M 30 M 20 M 45 M
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6 Assuming the volumes are additive, what is the + final H (aq) concentration produced by adding 300 mL of 050 M HNO3 to 700 mL of 100 M HCl (A) (B) (C) (D) (E) 075 M 150 M 125 M 085 M 043 M
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3 Strontium sulfate (SrSO4) will precipitate when a solution of sodium sulfate is added to a strontium nitrate solution What will be the strontium ion, 2+ Sr , concentration remaining after 300 mL of 010 M Na2SO4 solution are added to 700 mL of 020 M Sr(NO3)2 solution (A) (B) (C) (D) (E) 014 M 015 M 011 M 020 M 0030 M
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7 The molality of a 10-molar ethyl alcohol solution may be determined if which of the following is supplied (A) (B) (C) (D) (E) density of the solution van t Hoff factor for ethyl alcohol temperature of the solution volume of the solution solubility of ethyl alcohol
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4 Which of the following is a strong electrolyte when it is mixed with water (A) (B) (C) (D) (E) HNO2 KNO3 C2H5OH CH3COOH NH3
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8 A solution of chloroform, CHCl3, in carbon tetrachloride, CCl4, is nearly ideal The vapor pressure of chloroform is 170 mm Hg at 20 C, and the vapor pressure of carbon tetrachloride is 87 mm Hg at this temperature What is the mole fraction of carbon tetrachloride in the vapor over an equimolar solution of these two liquids (A) (B) (C) (D) (E) 025 087 066 050 034
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9 To prepare 30 L of a 020-molar K3PO4 solution (molecular weight 212), 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 30 L (B) The student should weigh 42 g of solute and add 30 Kg of water (C) The student should weigh 130 g of solute and add sufficient water to obtain a final volume of 30 L (D) The student should weigh 42 g of solute and add 30 L of water (E) The student should weigh 130 g of solute and add 30 L of water 10 A 52 molal aqueous solution of methyl alcohol, CH3OH, is supplied What is the mole fraction of methyl alcohol in this solution (A) (B) (C) (D) (E) 010 019 0086 0050 0094 14 I the molal freezing-point constant, Kf , of the solvent II the freezing point of the pure solvent and the freezing point of the solution When using the freezing-point depression method of determining the molar mass of a nonelectrolyte, what information is needed in addition to the above (A) the mass of the solute (B) the volume of the solvent and the mass of the solute (C) the mass of the solvent and the boiling point of the solvent (D) the mass of the solvent and the mass of the solute (E) no additional information is needed 15 A student has a solution with a mole fraction of 020 of chloroform (molecular mass 1194) in carbon tetrachloride (molecular mass 1538) What is the molality of chloroform in the solution (A) (B) (C) (D) (E) 17 m 017 m 020 m 13 m 120 m
11 Choose the aqueous solution with the highest boiling point (A) (B) (C) (D) (E) 010 M HI 010 M (NH4)3PO4 020 M C2H5OH 010 M NH4Cl 010 M NaI
16 A solution is 10 percent urea by mass Which item(s) from the following list are needed to calculate the molarity of this solution I the density of the solution II the density of the solvent III the molecular weight of urea (A) (B) (C) (D) (E) I and III I only II only III only I and II
12 How many grams of MgSO4 (molar mass 1204 g/mol) are in 1000 mL of a 50-molar solution (A) (B) (C) (D) (E) 600 g 50 g 12 g 600 g 120 g
13 How many milliliters of concentrated nitric acid (160-molar HNO3) are needed to prepare 0500 L of 60-molar HNO3 (A) (B) (C) (D) (E) 019 mL 250 mL 375 mL 190 mL 100 mL
17 Which of the following aqueous solutions would have the greatest freezing-point depression (A) (B) (C) (D) (E) 010 m (NH4)2SO4 010 m MnSO4 010 m NaF 010 m KCI 010 m CH3OH
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