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Based on Table F, which equation represents a saturated solution having the lowest concentration of Cl− ions?*
According to Table G, which substance forms an unsaturated solution when 80. grams of the substance are stirred into 100. grams of H2O at 10.°C?*
According to Table F, which substance is most soluble in water?*
Based on Table F, which compound is least soluble in water?*
Which substance is most soluble in water?*
Base your answers to questions 6 on the information below and on your knowledge of chemistry.
Water, H2O, and hexane, C6H14, are commonly used as laboratory solvents because they have different physical properties and are able to dissolve different types of solutes. Some physical properties of water and hexane are listed on the table below.
Determine the vapor pressure of water at 69°C.*
Base your answers to questions 7 on the information below and on your knowledge of chemistry.
A sample of normal rainwater has a pH value of 5.6 due to dissolved carbon dioxide gas from the atmosphere. Acid rain is formed when other gases, such as sulfur dioxide, dissolve in rainwater, which can result in lake water with a pH value of 4.6. The equation below represents the reaction of water with SO2(g).
Based on Table G, describe what happens to the solubility of SO2(g) as the temperature increases from 10.°C to 30.°C at standard pressure.*
Base your answers to questions 8 on the information below and on your knowledge of chemistry.
A 100.-gram sample of liquid water is heated from 20.0°C to 50.0°C. Enough KClO3(s) is dissolved 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 in 100. g of H2O at 50.0°C.*
Base your answers to questions 9 on the information below and on your knowledge of chemistry.
A bottled water label lists the ions dissolved in the water. The table below lists the mass of some ions dissolved in a 500.-gram sample of the bottled water.
Based on Table F, write the formula of the ion in the bottled water table that would form the least soluble compound when combined with the sulfate ion.*
Base your answers to questions 10 on the information below and on your knowledge of chemistry.
At 23°C, 85.0 grams of NaNO3(s) are dissolved in 100. grams of H2O(ℓ).
Based on Table G, determine the additional mass of NaNO3(s) that must be dissolved to saturate the solution at 23°C.*
Base your answers to questions 11 on the information below and on your knowledge of chemistry.
In a laboratory investigation, a student is given a sample that is a mixture of 3.0 grams of NaCl(s) and 4.0 grams of sand, which is mostly SiO2(s). The purpose of the investigation is to separate and recover the compounds in the sample. In the first step, the student places the sample in a 250-mL flask. Then, 50. grams of distilled water are added to the flask, and the contents are thoroughly stirred. The mixture in the flask is then filtered, using the equipment represented by the diagram below.
Based on Table G, state evidence that all of the NaCl(s) in the flask would dissolve in the distilled water at 20.°C.*
Base your answers to questions 12 on the information below and on your knowledge of chemistry.
A saturated solution of sulfur dioxide is prepared by dissolving SO2(g) in 100. g of water at 10.°C and standard pressure.
Based on Table G, state the general relationship between solubility and temperature of an aqueous SO2 solution at standard pressure.*
Base your answers to questions 13 on the information below and on your knowledge of chemistry.
Carbon dioxide is slightly soluble in seawater. As carbon dioxide levels in the atmosphere increase, more CO2 dissolves in seawater, making the seawater more acidic because carbonic acid, H2CO3(aq), is formed.
Seawater also contains aqueous calcium carbonate, CaCO3(aq), which is used by some marine organisms to make their hard exoskeletons. As the acidity of the sea water changes, the solubility of CaCO3 also changes, as shown in the graph below.
State the trend in the solubility of CaCO3 as seawater becomes more acidic.*
Base your answers to questions 14 on the information below and on your knowledge of chemistry.
Some compounds of silver are listed with their chemical formulas in the table below.
Identify the silver compound in the table that is most soluble in water.*
Base your answers to questions 15 on the information below and on your knowledge of chemistry.
A solution is made by dissolving 70.0 grams of KNO3(s) in 100. grams of water at 50.°C and standard pressure.
Determine the number of additional grams of KNO3 that must dissolve to make this solution saturated.*
