Acids, Bases, Salts and Neutralization
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1 Name Hour Acids, Bases, Salts and Neutralization Practice Test B
2 Objective 1: Solve problems involving the molarity of a solution 1. What is the molarity of a solution made by dissolving 17.5 moles of sodium phosphate in 100 L? 2. How many grams of aluminum sulfate are needed to make 750 ml of a 3 M solution? 3. What is the molarity of a solution made by dissolving 1.5 x 10-4 moles of aluminum chloride in 156 ml? Score: Objective 2: Describe how to prepare dilute solutions from more-concentrated solution of known molarity. 1. How many milliliters of a 10.0 M stock solution of ammonium sulfide do you need to dilute it to 150 ml of 1.5 M? 2. What is the concentration of a solution made by diluting 80 ml of a 6 M HCl solution to a total volume of 200 ml? 3. Completely describe how you would prepare 50 ml of a 0.75 M solution of sodium fluoride from a 1 M stock solution. Score:
3 Objective 3: Name an acid or base when given the formula, or give a formula from the name of an acid or base. 1. Write the formula of the following acids and bases: a. Hydroselenic acid b. hypochlorous acid c. Dichromic acid 2. Write the name for the following acids and bases: a. H 2 S b. H 3 PO 3 c. Ca(OH) 2 Score: Objective 4: Given the hydrogen-ion or hydroxide-ion concentration, calculate a ph. Indicate if a solution is acid, basic, or neutral. Calculate the ph of the following solutions. Indicate if it is acidic, basic or neutral. a. [H + ] = 6.3 x 10 2 b. [OH - ] = 1.2 x c. [OH - ] = 3.1 x 10-6 d. [H + ] = 1.0 x 10 7 e. [OH - ] = 2 x 10-7 Score: Objective 5: Given the ph or poh of a solution, calculate the hydrogen-ion or hydroxide ion concentration. 1. Calculate the [H + ] from the following values: a. ph = 2.5 b. poh = 10.8 c. poh = 6.0 d. ph = Calculate the [OH - ] from the following values: a. ph = 10.8 b. poh = 13.6 c. poh = 2.5 d. ph = 6.0 Score:
4 Objective 6: Calculate a ph of a solution by working molarity problems. 1. Calculate the ph of a solution made by dissolving grams of hydrochloric acid in a total volume of 3500 ml: 2. Calculate the ph of a solution made by dissolving 2.5 grams of rubidium hydroxide in a total volume of 1250 ml. 3. Calculate the ph of a solution made by dissolving 10 grams of hydroiodic acid in a total volume of 70 L. Score: Objective 7: Identify the conjugate base associated with a given Bronsted-Lowry acid and the conjugate acid with a given Bronsted-Lowry base. 1. Give the conjugate acid of each of the following bases: a. Water b. Dihydrogen phosphate ion c. NH 3, ammonia d. Nitrate ion 2. Give the conjugate bse of each of the following acids: a. Hydrophosphoric acid b. Water c. Ammonium ion d. Carbonic acid 3. Label the following species in the following equilibrias as either acid, base, conjugate acid or conjugate base. a. SO 3-2 (aq) + H 2 O (l) = HSO 3-1 (aq) + OH -1 (aq) b. HI(aq) + H 2 O (l) = H 3 O + (aq) + I c. NH 3 + HC 2 H 3 O 2 = NH C 2 H 3 O 2 - Score:
5 Objective 8: Perform calculations involving Ka or Kb for weak acids and weak base equilibrium. 1. Calculate the ph of each of the following solutions: a M citric acid (C 6 H 8 O 7 ), Ka = 7.4 x 10-4 b M phenol (C 6 H 5 OH), Ka = 1.3 x c molar Methylamine (CH 3 NH 2 ), Kb = 4.4 x Calculate the Ka or Kb of the following solutions: a. A student prepared a 0.21 M solution of heptonic acid HC 7 H 13 O 2 and measured its ph using a ph meter. The ph at 25 C was found to be 2.8. Calculate the Ka for heptonic acid at this temperature. b. Alanine, C 3 H 5 O 2 NH 2 is a weak organic base. A.41 M solution of alanine has a ph of Calculate the value of Kb for this substance. Score:
6 Objective 9: Calculate the concentration of an acid or a base by using solution stoichiometry.(titration problems) 1. Calculate the volume of a 12 M Hydrochloric acid needed to completely neutralize 5 ml of a 4.2 M Aluminum Hydroxide solution. 2. A student performed a titration and found that it took 15 ml of a 4.5 M solution of nitric acid to completely neutralize 90 ml of Barium hydroxide. Calculate the molarity of the base. 3. How many grams of Chloric acid are necessary to completely neutralize 3.5 grams of barium hydroxide? Score: Objective 10: Distributed Practice: Part 1: Atomic Structure: Fill in the following grid: Element Symbol Atomic Mass Protons Neutrons Electrons Number Number Sodium 23 Si 17 Bromine 79 Part 2: Electron Dots: Draw the Lewis Dot Structure for the following molecule: Nitric Acid
7 Part 3: Determine the molecular formula for a compound that is 38.8 % Chlorine and 61.2 % Oxygen; molar mass = grams. Part 4: Ideal Gas Law problem: In the Dumas-bulb technique for determining the molar mass of an unknown liquid, you vaporize the sample of a liquid that boils below 100 C in a boilingwater bath and determine the mass of vapor required to fill the bulb. See diagram below; From the following data, calculate the molar mass of the unknown liquid; Mass of unknown vapor =.012 g Volume of Bulb = 54 ml Pressure = 752 mm Hg Temperature = 90 C Score:
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