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What substance is formed during a neutralization reaction
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Compare the color of an indicator in acidic solution to its color in a basic solution Classify a solution as an acid or a base by observing the color of an indicator in that solution Observe the change in color of an indicator when the solution changes from acidic to basic Draw a conclusion about what substance is formed during the neutralization reaction of an acid and a base
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100M hydrochloric acid (HCl) 1M Sulfuric acid (H2SO4) 1M acetic acid (HC2H3O2) 100M sodium hydroxide (NaOH) 1M ammonium hydroxide (NH4OH) limewater saturated calcium hydroxide (Ca(OH)2) solution phenolphthalein blue litmus papers (6) red litmus papers (6) 100-mL beakers (2) 10-mL graduated cylinder test tubes (6) test-tube rack dropping pipette Bunsen burner striker ring stand ring wire gauze stirring rod filter paper evaporating dish
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Chemistry: Matter and Change 19
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Date
Class
LAB 191
LABORATORY MANUAL
Safety Precautions
Always wear safety goggles, a lab apron, and gloves Dispose of chemical wastes as directed by your teacher Hydrochloric acid, sulfuric acid, and acetic acid are corrosive to skin and clothing Hydrochloric acid, sulfuric acid, and acetic acid are toxic Sodium hydroxide and ammonium hydroxide are caustic and toxic Limewater is a tissue irritant
Pre-Lab
1 Define neutralization 2 Compare the color of litmus paper in acidic and
9 Use a stirring rod to transfer 1 drop of
basic solutions 3 Compare the color of phenolphthalein in acidic and basic solutions 4 Read the entire laboratory activity Form a hypothesis about how to know when an acid or a base has been neutralized Record your hypothesis on page 147 5 Summarize the procedures you will follow to test your hypothesis
10 11
12 13
hydrochloric acid (test tube number 1) to a piece of red litmus paper Then transfer 1 drop of hydrochloric acid to a piece of blue litmus paper Record your observations in Data Table 1 Rinse the stirring rod and repeat steps 9 and 10 for the remaining solutions Be sure to rinse the stirring rod between solution tests Add 2 drops of phenolphthalein solution to each solution in each of the numbered test tubes Record your observations in the data table
1 Label a 100-mL beaker acid and pour about
Part A: Acids and Bases
1 Number six test tubes 1 through 6 2 Pour about 1 mL of 1M hydrochloric acid (HCl) 3 4 5 6 7 8 2
into test tube number 1 Pour about 1 mL of 1M sulfuric acid (H2SO4) into test tube number 2 Pour about 1 mL of 1M acetic acid (HC2H3O2) into test tube number 3 Pour about 1 mL of 1M sodium hydroxide (NaOH) into test tube number 4 Pour about 1 mL of 1M ammonium hydroxide (NH4OH) into test tube number 5 Pour about 1 mL of limewater, saturated calcium hydroxide (Ca(OH)2), into test tube number 6 Place six pieces of red litmus paper and six pieces of blue litmus paper on a piece of filter paper
4 5 6
15 mL of 100M hydrochloric acid (HCl) into the beaker Label another 100-mL beaker base and pour about 15 mL of 100M sodium hydroxide (NaOH) into the beaker Using the 10-mL graduated cylinder, measure 100 mL of hydrochloric acid (HCl) and pour it into a clean evaporating dish Add 2 drops of phenolphthalein solution to the acid in the evaporating dish Stir the acid and gradually add about 9 mL of 100M sodium hydroxide (NaOH) Using a dropping pipette, add 100M sodium hydroxide (NaOH) drop by drop to the acid solution, stirring after each drop, until 1 drop of base causes the solution to remain a permanent red color
Chemistry: Matter and Change 19
Laboratory Manual
Copyright Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc
Procedure
Part B: Neutralization
Name
Date
Class
LAB 191 7 Add 1 drop of 100M hydrochloric acid (HCl)
LABORATORY MANUAL Hypothesis
The red color should disappear If the red color does not disappear, add another drop 8 Attach a ring to a ring stand and place a wire gauze on the ring Place the evaporating dish on the wire gauze 9 Use a Bunsen burner to slowly heat the contents of the evaporating dish to near dryness 10 Allow the evaporating dish to cool and examine the contents
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