unit 7 table g (solubility curves) question bank...a)38 g b)42 g c)58 g d)84 g 3.based on reference...

Unit 7 TABLE G (SOLUBILITY CURVES)Question Bank

A) KClO3 B) NH3

C) NaCl D) NH4Cl

1. Based on Reference Table G, which of the followingsubstances is most soluble at 50°C?

A) NaNO3 B) KNO3

C) NH4Cl D) KCl

2. Which of the salts listed below is most soluble at60ºC?

A) 38 g B) 42 g C) 58 g D) 84 g

3. Based on Reference Table G, what is the maximumnumber of grams of KCl(s) that will dissolve in 200grams of water at 50°C to produce a saturatedsolution?

A) NaCl B) KClO3

C) NH3 D) SO2

4. According to Reference Table G, a temperaturechange from 10°C to 30°C would have the least effecton the solubility of

A) supersaturated solution of NaNO3

B) saturated solution of NaNO3

C) supersaturated solution of KNO3

D) saturated solution of KNO3

5. A solution contains 100 grams of a nitrate saltdissolved in 100 grams of water at 50ºC. The solutioncould be a

A) HCl B) KClC) NaCl D) NH4Cl

6. Which compound becomes less soluble in water asthe temperature of the solution is increased?

A) NaCl B) KClC) NH4Cl D) HCl

7. According to Reference Table G, which of thefollowing substances is least soluble in 100 grams ofwater at 50ºC?

A) KNO3 B) KIC) NH3 D) NaCl

8. According to Table G, which substance forms anunsaturated solution when 80. grams of the substanceare stirred into 100. grams of H2O at 10.°C?

A) a saturated solution of NH3 with no excess NH3(g)

B) a saturated solution of NH3 in contact with excess NH3(g)

C) an unsaturated solution of NH3 with no excess NH3(g)

D) an unsaturated solution of NH3 in contact with excess NH3(g)

9. According to Reference Table G, which is the bestdescription of the system prepared by dissolving 30grams of NH3(g) in 100 grams of water at 20ºC?

A) 30 g B) 45 g C) 56 g D) 90 g

10. How many grams of KCl must be dissolved in 200grams of water to make a saturated solution at 60°C?

A) 16 B) 32 C) 48 D) 64

11. A student determined the mass, in grams, ofcompound X that would saturate 30. grams of waterover a temperature range of 40.°C in 10.-degreeintervals. The results are tabulated below.

If this solubility trend continues, what is the totalnumber of grams of compound X that will dissolvein 30. grams of water at 60.°C?

A) 46 g B) 61 gC) 85 g D) 126 g

12. A saturated solution of NaNO3 is prepared at 60.ºCusing 100. grams of water. As this solution is cooledto 10.ºC, NaNO3 precipitates (settles) out of thesolution. The resulting solution is saturated.Approximately how many grams of NaNO3 settledout of the original solution?

A) NH3 B) HClC) SO2 D) KNO3

13. According to Reference Table G, which compound'ssolubility decreases most rapidly when thetemperature increases from 50ºC to 70ºC?

TABLE G (SOLUBILITY CURVES)

A) 1 B) 2 C) 3 D) 4

14. A student obtained the following data in a chemistry laboratory.

Based on Reference Table g, which of the trials seems to be in error?

A) KNO3 B) KClC) NaNO3 D) NaCl

15. Which salt has the greatest change in solubilitybetween 30ºC and 50ºC?

A) decreasing the pressureB) increasing the pressureC) decreasing the temperatureD) increasing the temperature

16. Based on Reference Table G, what change will causethe solubility of KNO3(s) to increase?

A) 40 g NH4Cl in 100 g water at 50ºCB) 2 g SO2 in 100 g water at 10ºCC) 52 g KCl in 100 g water at 80ºCD) 120 g KI in 100 g water at 20ºC

17. Which is a saturated solution?

A) 17 g B) 22 g C) 47 g D) 64 g

18. According to Reference Table G, what is theapproximate difference between the amounts ofKClO3 and KNO3 soluble in 100 grams of water at40ºC?

A) NaCl B) KClC) KClO3 D) NH4Cl

19. According to Reference Table G, which of thesesubstances is most soluble at 60ºC?

A) 30 g of KCI B) 35 g of NH4ClC) 60 g of KNO3 D) 110 g of NaNO3

20. Which quantity of salt will form a saturated solutionin 100 grams of water at 45ºC?

A) HCl B) KClC) NaCl D) NH4Cl

21. At standard pressure, which substance becomes less soluble in water as temperature increases from10.°C to 80.°C?

A) potassium nitrateB) sodium chlorideC) potassium chlorateD) ammonium chloride

22. A student tested the solubility of a salt at differenttemperatures and then used Reference Table g toidentify the salt. The student's data table appearsbelow.

What is the identity of the salt?

A) KNO3 B) NH4ClC) NaNO3 D) KCl

23. Which compound forms a saturated solution at 40°Cthat contains 46 grams per 100 grams of water?

A) SO2 B) NaClC) KClO3 D) NH4Cl

24. Which compound is least soluble in 100 grams ofwater at 40°C?


A) A B) B C) C D) D

25. The graph below represents four solubility curves.Which curve best represents the solubility of a gas inwater?

A) a saturated solution of KClO3

B) a saturated solution of KClC) an unsaturated solution of NaClD) an unsaturated solution of NH4Cl

26. Based on Reference Table G, which salt solutioncould contain 42 grams of solute per 100 grams ofwater at 40ºC?

A) 5 g B) 10. g C) 15 g D) 20. g

27. An unsaturated aqueous solution of NH3 is at 90°Cin 100. grams of water. According to ReferenceTable G, how many grams of NH3 could thisunsaturated solution contain?

A) decreases by 10 gramsB) decreases by 40 gramsC) increases by 10 gramsD) increases by 40 grams

28. As the temperature increases from 0ºC to 25ºC theamount of NH3 that can be dissolved in 100 gramsof water

A) KClO3 B) KNO3

C) NaCl D) NH4Cl

29. Which compound is least soluble in water at 60. °C?

A)

B)

C)

D)

30. A student obtained the following data in determiningthe solubility of a substance.

Which graph best represents the solubility curvedrawn from the results obtained by the student?

A) NH4Cl B) NaClC) NH3 D) NaNO3

31. Which compound decreases in solubility as thetemperature of the solution is increased from 10ºC to50ºC?


A) The solubility of NH3 decreases, and thesolubility of KCl decreases.

B) The solubility of NH3 decreases, and thesolubility of KCl increases.

C) The solubility of NH3 increases, and thesolubility of KCl decreases.

D) The solubility of NH3 increases, and thesolubility of KCl increases.

32. According to Reference Table G, how does adecrease in temperature from 40°C to 20°C affectthe solubility of NH3 and KCl?

A) A B) B C) C D) D

33. Solubility data for four different salts in water at60°C are shown in the table below.

Which salt is most soluble at 60°C?

A) temperature of the solution increasesB) temperature of the solution decreasesC) pressure on the solution increasesD) pressure on the solution decreases

34. The solubility of KClO3(s) in water increases as the

A) NH4Cl is the solute, and the solution issaturated.

B) NH4Cl is the solute, and the solution isunsaturated.

C) NH4Cl is the solvent, and the solution issaturated.

D) NH4Cl is the solvent, and the solution isunsaturated.

35. A solution is formed by dissolving 45 grams of NH4Cl in 100 grams of H2O at 70ºC. Which statementcorrectly describes this solution?

A) 43 g B) 86 gC) 134 g D) 268 g

36. According to Reference Table G, how many gramsof KNO3 would be needed to saturate 200 grams ofwater at 70ºC?

A) an unsaturated solution of KClB) an unsaturated solution of KClO3

C) a saturated solution of KClD) a saturated solution of KClO3

37. According to Reference Table G, which solution atequilibrium contains 50 grams of solute per 100grams of H2O at 75°C?

A) KI B) KNO3

C) NaNO3 D) NaCl

38. According to your Reference Tables, whichsubstance forms an unsaturated solution when 80grams of the substance is dissolved in 100 grams ofH2O at 10°C?

A) saturatedB) supersaturatedC) dilute and unsaturatedD) dilute and saturated

39. A solution containing 60. grams of NaNO3 completely dissolved in 50. grams of water at 50ºCis classified as being

A) 12 grams of KClO3 in 100 grams of waterB) 12 grams of KClO3 in 200 grams of waterC) 30 grams of NaCl in 100 grams of waterD) 30 grams of NaCl in 200 grams of water

40. According to Reference Table G, which solution issaturated at 30°C?

A) CCl4 B) CO2 C) HCl D) N2

41. At STP, which of these substances is most soluble inH2O?

42. Base your answer to the following question on on theinformation below.

A solution is made by completely dissolving 90.grams of KNO3(s) in 100. grams of water in abeaker. The temperature of this solution is 65°C.

Determine the total mass of KNO3(s) that settles tothe bottom of the beaker when the original solutionis cooled to 15°C.


Base your answers to questions 43 and 44 on the data table below, which shows the solubility of asolid solute.

43. Based on the data table, if 15 grams of solute is dissolved in 100 grams of water at 40°C, how many more grams of solute can be dissolved in this solution to make it saturated at 40°C?

44. According to Reference Table G, how many grams of KClO3 must be dissolved in 100 grams of H2Oat 10°C to produce a saturated solution?

45. Determine the mass of that dissolves in 100. grams of water at 40°C to produce a saturatedsolution.

Base your answers to questions 46 through 48 on the information below.

A student uses 200 grams of water at a temperature of 60°C to prepare a saturated solution ofpotassium chloride, KCl.

46. This solution is cooled to 10°C and the excess KCl precipitates (settles out). The resulting solution issaturated at 10°C. How many grams of KCl precipitated out of the original solution?

47. According to Reference Table G, how many grams of KCl must be used to create this saturatedsolution?

48. Identify the solute in this solution.


49. Base your answer to the following question on the information below.

The graph shows the relationship between the solubility of a sequence of primary alcohols in waterand the total number of carbon atoms in a molecule of the corresponding alcohol at the sametemperature and pressure. A primary alcohol has the –OH group located on an end carbon of thehydrocarbon chain.

Determine the total mass of 1-pentanol that will dissolve in 110. grams of water to produce asaturated solution.

50. Base your answer to the following question on the Reference Tables for Physical Setting/Chemistry.Based on Table G, determine the total mass of NH3 that must be dissolved in 200. grams of water toproduce a saturated solution at 20.°C.

51. Base your answer to the following question on the information below

An unsaturated solution is made by completely dissolving 20.0 grams of NaNO3 in 100.0 grams ofwater at 20.0°C.Determine the minimum mass of NaNO3 that must be added to this unsaturated solution to make asaturated solution at 20.0°C.


52. Base your answer to the following question on the information below and on your knowledge ofchemistry.

A student prepares two 141-gram mixtures, A and B. Each mixture consists of NH4Cl, sand, andH2O at 15°C. Both mixtures are thoroughly stirred and allowed to stand. The mass of eachcomponent used to make the mixtures is listed in the data table below.

Determine the temperature at which all of the NH4Cl in mixture A dissolves to form a saturatedsolution.


In a laboratory investigation, a student is given a sample that is a mixture of 3.0 grams ofNaCl(s) and 4.0 grams of sand, which is mostly SiO2(s). The purpose of the investigation is toseparate and recover the compounds in the sample. In the first step, the student places the samplein a 250-mL flask. Then, 50. grams of distilled water are added to the flask, and the contents arethoroughly stirred. The mixture in the flask is then filtered, using the equipment represented bythe diagram below.

Based on Table G below, state evidence that all of the NaCl(s) in the flask would dissolve in thedistilled water at 20.°C.


A saturated solution of sulfur dioxide is prepared by dissolving SO2(g) in 100. g of water at10.°C and standard pressure.

Determine the mass of SO2 in this solution.


55. Base your answer to the following question on the information below and you knowledge ofchemistry.

A 100.-gram sample of liquid water is heated from 20.0°C to 50.0°C. Enough KClO3(s) isdissolved in the sample of water at 50.0°C to form a saturated solution.

Based on Table G, determine the mass of KCLO3(s) that must dissolve to make a saturated solution in100. g of H2O at 50.0°C.


In a laboratory investigation, ammonium chloride was dissolved in water. Laboratoryprocedures and corresponding observations made by a student during the investigation are shownin the table below.

State evidence from the investigation that indicates the solution is saturated.


In a laboratory, a student makes a solution by completely dissolving 80.0 grams of KNO3(s) in 100.0 grams of hot water. The resulting solution has a temperature of 60.°C. The roomtemperature in the laboratory is 22°C.

Classify, in terms of saturation, the type of solution made by the student.


A 1.0-gram strip of zinc is reacted with hydrochloric acid in a test tube. The unbalanced equationbelow represents the reaction.

____ Zn(s) + ____HCl(aq) ____H2(g) + ____ ZnCl2(aq)Explain, using information from the reference table, why symbol (aq) is used to describe the product ZnCl2.


59. Base your answer to the following question on the information below

Scientists who study aquatic ecosystems are often interested in the concentration of dissolvedoxygen in water. Oxygen, O2, has a very low solubility in water, and therefore its solubility isusually expressed in units of milligrams per 1000. grams of water at 1.0 atmosphere. The graphbelow shows a solubility curve of oxygen in water.

A student determines that 8.2 milligrams of oxygen is dissolved in a 1000.-gram sample of water at15°C and 1.0 atmosphere. In terms of saturation, what type of solution is this sample?


The compounds NH4Br(s) and NH3(g) are soluble inwater. Solubility data for NH4Br(s) in water arelisted in the table below.

Determine the total mass of NH4Br(s) that must bedissolved in 200. grams of H2O at 60.°C to produce asaturated solution.

Answer KeyTABLE G (Solubility curves) (60)

1. D2. A3. D4. A5. C6. A7. A8. B9. C10. D11. D12. A13. A14. D15. A16. D17. C18. C19. D20. D21. A22. C23. B24. A25. B26. D27. A28. B29. A30. A31. C32. C33. D34. A35. B

36. D37. C38. A39. B40. A41. C42. 60 g - 64 g43. 944. 7; 145. 64 g, or any value

from 62 g to 66 g,inclusive.

46. Allow credit for 30 (±2). or Allowcredit for a responseconsistent with thestudent’s answer toprevious question.

47. Allow credit for 90 (±2).

48. Allow credit for KCl or potassiumchloride.

49. 2.5 g 0.1 g50. 112 g 3 g.51. 68 1 g52. 23°C to 26°C

53. — According toTable G, the saltsolution isunsaturated.— The 3.0 g of saltdissolved in 50. g ofH2O has aconcentration lessthan the solubility ofNaCl on Table G at20.°C.— Table G indicatesthat the solubility ofNaCl is greater thanthe amount in thesample.

54. — 15g to 18g55. Any value from 20.

g to 23 g, inclusive.56. — The solution is

saturated becausesome remainedundissolved at thebottom of the testtube after stirring thecontents of the testtube for 4 minutes.— Not all dissolved.

57. The solution madeby the student isunsaturated.

58. Example: Theproduct ZnCl2 issoluble in water.

59. The sample is anunsaturated solution.

60. 210. g

unit 7 table g (solubility curves) question bank...a)38 g b)42 g c)58 g d)84 g 3.based on reference...

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