GEN CHEM & QUAL ANALY
GEN CHEM & QUAL ANALY CHM 2046
Popular in Course
Popular in Chemistry
This 3 page Class Notes was uploaded by Brigitte Wyman on Friday September 18, 2015. The Class Notes belongs to CHM 2046 at University of Florida taught by George Gower in Fall. Since its upload, it has received 17 views. For similar materials see /class/207004/chm-2046-university-of-florida in Chemistry at University of Florida.
Reviews for GEN CHEM & QUAL ANALY
Report this Material
What is Karma?
Karma is the currency of StudySoup.
You can buy or earn more Karma at anytime and redeem it for class notes, study guides, flashcards, and more!
Date Created: 09/18/15
WRITE YOUR NAME HERE CHM 2046 Gower sections Exam 1 Form Code A Fall 2014 Instructions On your scantron sheet enter and bubble in your name UF ID number and Form Code Check your bubbling carefully 7 bubbling errors will not be negotiated Turn in your scantron and retain your exam with your answers circled Potentially useful info Kw 1 x 10 14 at 25 C pH flog H30 pH pKa log base acid The double headed arrow used in this exam lt gt refers to a dynamic equilibrium system Assume all systems are at 25 OC and all aqueous solutions are prepared with pure water 1 It is determined that a maximum of 2055 g of ZnIO3z will dissolve in 500 mL of pure water at 25 C From this information estimate the solubility product constant K W for zinc iodate 1 49 x1077 2 39 x1076 3 97 x1077 4 98 x1075 5 24 x1075 2 Predict which solution would be the least basic potentially helpful info H3B03 is boric acid 1 010 M NaHzB03 2 010 M NazHB03 3 010 M Na3B03 4 010 M NaHSO4 5 010 M NazSO4 3 Consider the following a the Ka of HXOZ is greater than the K a of HYOz but b the Ka of HzX is less than the Ka of HzY Which of the following best explains a and b above 1 a X is more electronegative than Y and b the HiX bond is shorter than the HiY bond 2 a X is less electronegative than Y and b the HiX bond is longer than the HiY bond 3 a the HiX bond is weaker than the HiY bond and b X is more electronegative than Y 4 a the HiX bond is stronger than the HiY bond and b X is less electronegative than Y 5 a the oxidation state of X is greater than that of Y and b the HiX bond is shorter than the HiY bond 4 Select the falj statement below regarding MgCO3 Kip 40 x 1075 1 the experimental molar solubility of MgC03 is predicted to be greater than the molar solubility of MgCOg calculated from its K g 2 the molar solubility of MgCO3 is predicted to be greater in pure water than in water containing C0327 ions 3 the molar solubility of MgC03 is predicted to be greater in 010 M HCl than in pure water 4 the molar solubility of MgCO3 is predicted to be greater in 20 L of water than in 10 L of water 5 a saturated MgCO3 solution is predicted to exhibit a pH greater than 7 5 Lab student A prepared 100 mL of a 010 M solution of Na3PO4 and lab student B accidentally dipped a pipet containing 02 mL of a 0005 M CaClz solution into it Should lab student A be concerned that the P0437 changed appreciably in her Na3PO4 solution That is does any Ca3PO4z Kip 10 x 10725 precipitate out of solution Why or why not 1 no P0437 will not decrease because no Ca3PO4z will precipitate out of solution because Q lt 5p 2 no P0437 will not decrease because no Ca3PO4z will precipitate out of solution because Q gt 3 no P0437 will not decrease because no Ca3PO4z will precipitate out of solution because Q 5p 4 yes P0437 will decrease because Ca3PO4z will precipitate out of solution because Q gtK5P 5 yes P0437 will decrease because Ca3PO4z will precipitate out of solution because Q ltK5P 6 Which ofthe following is closest to the Ag in a saturated solution of Ang04 Kip 17 x 1075 1 0016 M 2 0032 M 3 0065 M 4 00041 M 5 00082 M 7 Select the true statement below l a 010 M NazHPO4 solution is predicted to have a lower pH than a 010 M Na3PO4 solution 2 a 010 M KN03 solution is predicted to have a lower pH than a 010 M PbN03z solution 3 a 010 M NH4Cl solution is predicted to have a higher pH than a 010 M KCl solution 4 a 010 M NazS03 solution is predicted to have a lower pH than a 010 M NaHS03 solution 5 a 010 M NaHSO4 solution is predicted to have a pH gt 7 8 Calculate the pH of the resulting solution when 75 mg of nickelH nitrate hexahydrate NiN03z6H20 is dissolved in 250 mL ofwater at 2500 The K ofNiHzO52 is 10 x 10 1 649 2 556 3 449 4 384 5 308 9 Which of the following statements involving H2C03 HC03 C032 and or C02 is false 1 HCO3 can act as either a BronstedLowry acid or a BronstedLowry base 2 C0327 can act as either a BronstedLowry base or a Lewis acid 3 both HC03 and C0327 are stronger BronstedLowry bases than H20 4 C0327 HCO3 is a good buffer system but C0327 HZCO3 is not a good buffer system 5 C02 is a Lewis acid but it is neither a Lewis base nor a BronstedLowry base 10 Consider the following reactions and select the most likely falj statement below Reaction 1 CoZaq 6H201 gt CoHzO5zaq Reaction 11 CoHzO5zaq H201lt gt CoHzO5OHaq H30aq K 2 x 10 10 Reaction 111 CoHzO52aq 3C2042 aq lt gt CoC204347aq 6H20aq Kf 5 x 109 1 Reaction I is a Lewis acidbase reaction 2 Reaction II is a BronstedLowry acidbase reaction 3 Reaction III is a BronstedLowry acidbase reaction M a Lewis acidbase reaction 4 CoHzO5Z is a stronger acid than H20 5 CoC03 Kg 8 x 10713 is more soluble in l M NazCzO4 than in pure water 11 Predict the resulting pH if 200 mL of 0100 M NaOH is added to 200 mL of 0200 M NaHSO3 K ostog 62 x1078 and K ostog 83 x10 1 191 2 410 3 721 4 751 5 1208 12 Which of the following statements regarding an A7 HA buffer isare true a the desired buffer pH should be within i 1 pH unit from the pKa of the acid component HA b a relatively high base component A7 increases the ionization of the acid component HA c incoming strong base like OH will be consumed by reaction with the acid component HA d a good perchlorate buffer might be prepared with mixing 05 M NaClO4 with 05 M HClO4 e the optimal buffer will exhibit a ratio of A7 HA between 01 and 10 and preferably close to 10 1 ab only 2 bd only 3 ce only 4 abe only 5 ace only 13 You wish to make a chloroacetate chloroacetic acid CZHZOZCl HCZHZOzCl buffer solution with a pH of300 by dissolving 100 g of solid sodium chloroacetate into 500 mL of a chloroacetic acid solution What must be the concentration of the chloroacetic acid solution to make this happen The K a for chloroacetic acid is 140 x 1073 Assume no volume change during dissolution of the salt 1 0012 M 2 0015 M 3 0018 M 4 0027 M 5 0041 M 14 If a 010 M aqueous solution of HClO exhibits a pH of 423 predict the pH ofa 010 M aqueous solution ofNaClO at the same temperature 1 377 2 882 3 933 4 1023 5 1137 15 What equilibrium molar concentration of sodium cyanide solution would be expected to provide an equilibrium hydroxide ion concentration of 1 x 1073 M Ka for HCN is 40 x 10710 1 004 M 2 040 M 3 080 M 4 11M 5 19 M 16 An aqueous solution contains 010 M of Ca2 and 010 M Mg2 Which of the following is closest to the maximum concentration of OH ions necessary to add to the solution in order to selectively precipitate out which metal ion leaving the other ion in solution KW values CaOHz 79 x 10 6 MgOHz 15 x 10 1 lt 12 x 10 5 M OH to selectively precipitate out Mg2 as MgOHz leaving Ca2 in solution 2 lt 12 x 10 5 M OH to selectively precipitate out Ca2 as CaOHz leaving Mg2 in solution 3 lt 89 x 1073 M OH to selectively precipitate out Mg2 as MgOHz leaving Ca2 in solution 4 lt 89 x 10 3 M OH to selectively precipitate out Ca2 as CaOHz leaving Mg2 in solution 5 this particular selective precipitation can not be done because the K A values are too far apart 17 What is the approximate ratio of the solubility of leadII sulfate in a 050 M solution of potassium oxalate K2C204 to the solubility of leadII sulfate in pure water at 25 C KW of1eadII sulfate is 18 x 10 8 and K of PbC204227 is 35 x 106 1 Z 45 2 Z 330 3 Z 370 4 Z 620 5 Z 1100 18 Consider the following equilibrium system at 25 C and select the true statement below HNOzaq H20l lt gt H30aq N027aq Ka 45 x 10 4 at 25 C 1 N027 is a weaker base than H20 2 HNOz is a stronger acid than H30 3 this is a productfavored system at 25 C 4 the Kb ofNOz is gt than the Ka of HNOZ at 25 C 5 none of these statements are true except for this one 19 Select the false statement below 1 0001 M HCOOH is predicted to exhibit a greater ionization than 01 M HCOOH 2 0001 M HCOOH is predicted to exhibit a higher pH than 01 M HCOOH 3 0001 M HCOOH is predicted to produce a smaller H3O concentration than 01 M HCOOH 4 0001 M HCOOH is predicted to produce a smaller HCOOC concentration than 01 M HCOOH 5 0001 M HCOOH is predicted to exhibit a lower Ka than 01 M HCOOH 20 A 100 g sample of solid zinc metal is placed in 2000 mL of an aqueous nitric acid solution with an initial pH of 0800 The zinc reacts with the acid to form aqueous ions Zn2 and N037 and also Hz gas Determine the pH of the solution after all the zinc metal has reacted assuming constant volume 1 013 2 099 3 109 4 192 5 225
Are you sure you want to buy this material for
You're already Subscribed!
Looks like you've already subscribed to StudySoup, you won't need to purchase another subscription to get this material. To access this material simply click 'View Full Document'