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1. Experimental Procedure, Part A. a. What is the criterion for clean glassware? 2 b. What is the size and volume of a "small, clean test tube"? 7a "In 2. Experimental Procedure, Part A.2. Describe the technique for testing the odor of a chemical. 17a, ty 3. Identify at least five observations that are indicative of a chemical reaction. 4. Depending upon the tip of a dropper pipet, there are approximately 20 drops per milliliter of water. The Experimental Procedure, Parts A and B, indicates the addition of 5-10 drops of each solution (Figure 2.2a) to the test tubes. Calcu- late the volume range in milliliters for the solution. 5. Experimental Procedure, Part A. The substances NaCl, Na2CO3, MgSO4, and NH4CI which are used for test solutions, are all soluble ionic compounds. For each substance, indicate the ions present in its respective test solution. NaCl: Na2CO3: MgSO4: NH4CI: 6. Three colorless solutions in test tubes, with no labels, are in a test tube rack on the laboratory bench. Lying beside the test tubes are three labels: potassium iodide, KI; silver nitrate, AgNO3; and sodium sulfide, Na2S. You are to place the labels on the test tubes using only the three solutions present. Here are your tests: A portion of test tube 1 added to a portion of test tube 3 produces a yellow silver iodide precipitate. A portion of test tube 1 added to a portion of test tube 2 produces a black silver sulfide precipitate. a. Your conclusions are: Test tube 1 Test tube 2 Test tube 3 b. Write the balanced equation for the formation of silver iodide, AgI, from a mix of two selected solutions provided above. c. Write the balanced equation for the formation of silver sulfide, Ag2S, from a mix of two selected solutions provided above. Laboratory Questions Circle the questions that have been assigned. 1. Identify a chemical reagent used in this experiment that can be used to distinguish solid CaCl2 (soluble) from solid CaCO3 (insoluble). What is the distinguishing observation? 2. What test reagent used in this experiment will distinguish a soluble Cl salt from a soluble salt? What is the distinguishing observation? 3. Predict what would be observed (and why) from an aqueous mixture for each of the following (all substances are water soluble). a. potassium carbonate and hydrochloric acid b. zinc chloride and silver nitrate c. magnesium chloride and sodium hydroxide d. ammonium nitrate and sodium hydroxide 4. Three colorless solutions in test tubes, with no labels, are in a test tube rack on the laboratory bench. Lying beside the tests tubes are three labels: 0.10 M Na2CO3, 0.10 M HCI, and 0.10 M KOH. You are to place the labels on the test tubes using only the three solutions present. Here are your tests: A few drops of the solution from test tube 1 added to a similar volume of the solution in test tube 2 produces no vis- ible reaction but the solution becomes warm. A few drops of the solution from test tube 1 added to a similar volume of the solution in test tube 3 produces carbon dioxide gas. Identify the labels for test tubes 1, 2, and 3. 5. Three colorless solutions in test tubes, with no labels, are in a test tube rack on the laboratory bench. Lying beside the test tubes are three labels: silver nitrate, AgNO3; hydrochloric acid, HCl; and sodium carbonate, Na2CO3. You are to place the labels on the test tubes using only the three solutions present. Here is your analysis procedure: A portion of test tube 1 added to a portion of test tube 2 produces carbon dioxide gas, CO2. A portion of test tube 2 added to a portion of test tube 3 produces a white silver carbonate precipitate. a. On the basis of your observations how would you label the three test tubes? b. What would you expect to happen if a portion of test tube 1 is added to a portion of test tube 3? 6. For individual solutions of the cations Ag+, Ba2+, Mg2+, and Cu2+, the following experimental observations were collected: NH3(aq) HCl(aq) H2SO4(aq) Ag+ No change White ppt" No change Ba2+ No change No change White ppt Mg²+ White ppt No change No change Cu2+ Blue ppt/deep blue soln with excess No change No change "Example: When an aqueous solution of hydrochloric acid is added to a solution containing Ag+, a white precipitate (ppt) forms. From these experimental observations, a. identify a reagent that distinguishes the chemical properties of Ag+ and Mg²+. What is the distinguishing observation? b. identify a reagent that distinguishes the chemical properties of HCI and H2SO4. What is the distinguishing observation? c. identify a reagent that distinguishes the chemical properties of Ba2+ and Cu2+ What is the distinguishing observa- tion? *d. identify a reagent that distinguishes the chemical properties of Cu2+ and Mg2+. What is the distinguishing obser- vation?

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1. During the final wash out with deionized water, no droplets adhere to the clean part of the glassware
2. Most oftenly there are three types of “small, clean test tube”:

75-mm (3-inch) test tube ~3 mL
150-mm (6-inch) test tube ~25 mL
200-mm (8-inch) test tube ~75 mL...

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