Solutions Test /40 Complete ALL questions in the space provided! Part I: Interpreting a Solubility Curve [10 marks] 1. Name one substance that decreases in solubility with an increase in temperature?
2. How many grams of solute are required to saturate 100 g of water in each solution below? a. NH4Cl at 70oC b. KNO3 at 30oC 3. State whether each solution described below is saturated, unsaturated or supersaturated when mixed with 100 g of water. a. 10 g of SO2 at 10oC b. 60 g of NH4Cl at 60oC 4. How many grams of KNO3 per 100 g of water would be crystallized from a saturated solution as the temperature drops from: a. 60oC to 30oC b. 50oC to 10oC 5. At what temperature are the solutes below equally soluble in 100 g of water? a. NaNO3 and KNO3 6. Which solute is least affected by the temperature changes?
7. At 10oC, which substance would be most soluble in 100g of water?
Chemistry 12
Name: __________________________
Part II: Multiple Choice Questions—circle the best response [10 marks] 1. Which substance below is a “weak” acid? a. b. c. d.
Perchloric acid Hydrofluoric acid HBr H2SO4
2. Which substance below would be a non-electrolyte in water at room temperature? a. b. c. d.
C6H12O6 HCl NaOH KNO3
3. A homogeneous mixture with relative large amount of solute compared with the volume of solvent? a. b. c. d.
4. Which substance below will undergo “partial” ionization? a. b. c. d.
HCl CaSO4 H3BO3 CO2
5. What is the percent concentration (m/v) of 450.0 mL of a solution that contains 50.0g of strontium fluoride, SrF2? a. b. c. d.
11.1% 50.0% 88.9% 900%
Chemistry 12
Name: __________________________
6. Sodium hydroxide (caustic soda, lye) is an important base. What volume of 0.600mol/L NaOH can be prepared from 4.8g of solute? a. b. c. d.
0.050 0.20 0.60 3.5
7. What volume of household ammonia solution (0.70 mol/L) is required to prepare 250.0mL of a comb and hairbrush cleaning solution (0.021 mol/L)? a. b. c. d.
8300 mL 250 mL 125 mL 7.5 mL
8. A solution is prepared by dissolving 12.5g of copper (II) nitrate in water to give a total solution volume of 100mL. What is the concentration of the nitrate ions in the solution? a. b. c. d.
0.333 M 1.33 M 3.75 M 12.3 M
9. Which is the correct “nonionic” equation for a reaction between a solution of lead (II) nitrate that is mixed with sodium iodide? a. b. c. d.
10. If all the solutes below are dissolved in water at 60oC, which forms the most concentrated solution? a. b. c. d.
30 g in 90 mL of H2O 40 g in 160 mL of H2O 20 g in 40 mL of H2O 10 g in 50 mL of H2O
BONUS: Who am I? [2 marks] I am a poisonous metal. My most common oxidation charge is 2+ and with that charge I will not dissociate in water if I have already been formed into a compound with acetate. Who am I?
Chemistry 12
Name: __________________________
Part III: Extended Responses [25 marks] Write non-ionic, total ionic and net ionic equations for the reactions below: a. Bromine reacts with a sodium fluoride solution. [4—1 Non, 2 Total, 1 Net] Nonionic: Total ionic: Net ionic:
b. Solutions of barium chloride and potassium sulfate are mixed. [4] Nonionic: Total ionic: Net ionic:
2. Explain the difference between an unsaturated, saturated and supersaturated solution. [2]
3. Rubbing alcohol is sold as a 70% (v/v) solution of isopropyl alcohol in water. What volume of isopropyl alcohol is used to make 500.0 mL of rubbing alcohol? [2]
Chemistry 12
Name: __________________________
4. Water supplies with dissolved calcium carbonate greater than 500.0 mg/L are considered unacceptable for domestic purposes. Express in ppm and ppb. [2]
5. If 20.0 mL of 8.0 mol/L hydrochloric acid is diluted to 150.0 mL what is the final concentration of the HCl (aq)? [2]
6. Calculate the molar concentration of a solution of NaCl that contains 10.0 grams of NaCl in a 2 liter solution. [2]
Chemistry 12
Name: __________________________
7. A sodium nitrate solution contains 0.64g of NaNO3 per 100mL of solution. What is the concentration of the sodium ions in solution? [2]
8. What volume of 3.00 mol/L HNO3(aq) is required to neutralize 450.0 mL of a 0.100 mol/L strontium hydroxide solution? [4]
9. Show the net ionic reaction produced for whenever any strong acid and any strong base are mixed together. [1]
Page 1 of 6. Chemistry 12 Name: Solutions Test. /40. Complete ALL questions in the space provided! Part I: Interpreting a Solubility Curve [10 marks]. 1.
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Page 1 of 9. Chemistry 12 Name: 1. Solutions and Electrochemistry Test. Section I: Fill in the BlanksâUse the solubility curve to answer the questions below on the. sheet provided [10]. 1. How many grams of solute are required to. saturate 100 g of
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