Chapter 4(a) Types of Chemical Reactions and Solution Stoichiometry.

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Presentation transcript:

Chapter 4(a) Types of Chemical Reactions and Solution Stoichiometry

Copyright © Houghton Mifflin Company. All rights reserved.4a–2 Figure 4.1: (Left) The water molecule is polar. (Right) A space-filling model of the water molecule.

Copyright © Houghton Mifflin Company. All rights reserved.4a–3 Figure 4.2: Polar water molecules interact with the positive and negative ions of a salt assisting in the dissolving process.

Copyright © Houghton Mifflin Company. All rights reserved.4a–4 Figure 4.3: (a) The ethanol molecule contains a polar O—H bond similar to those in the water molecule. (b) The polar water molecule interacts strongly with the polar O—H bond in ethanol. This is a case of "like dissolving like."

Figure 4.4: Electrical conductivity of aqueous solutions.

Copyright © Houghton Mifflin Company. All rights reserved.4a–6 Figure 4.5: When solid NaCl dissolves, the Na+ and Cl- ions are randomly dispersed in the water.

Figure 4.6: HCl(aq) is completely ionized.

Figure 4.7: An aqueous solution of sodium hydroxide.

Figure 4.8: Acetic acid (HC 2 H 3 O 2 ) exists in water mostly as undissociated molecules. Only a small percentage of the molecules are ionized.

Figure 4.9: The reaction of NH 3 in water.

Copyright © Houghton Mifflin Company. All rights reserved.4a–11 Figure 4.10: Steps involved in the preparation of a standard aqueous solution.

Figure 4.11: (a) A measuring pipet is graduated and can be used to measure various volumes of liquid accurately. (b) a volumetric (transfer) pipet is designed to measure one volume accurately.

Copyright © Houghton Mifflin Company. All rights reserved.4a–13 Figure 4.12: Dilution Procedure (a) A measuring pipet is used to transfer 28.7mL of 17.4 M acetic acid solution to a volumetric flask. (b) Water is added to the flask to the calibration mark. (c) The resulting solution is 1.00 M acetic acid.

Figure 4.13: When yellow aqueous potassium chromate is added to a colorless barium nitrate solution, yellow barium chromate precipitates.

Copyright © Houghton Mifflin Company. All rights reserved.4a–15 Figure 4.14: Reactant Solutions: (a) Ba(NO 3 ) 2 (aq) and (b) K 2 CrO 4 (aq)

Copyright © Houghton Mifflin Company. All rights reserved.4a–16 Figure 4.15a,b: The reaction of K 2 CrO 4 and Ba(NO 3 ) 2 (aq).

Figure 4.15c: The reaction of K 2 CrO 4 and Ba(NO 3 ) 2 (aq). (cont'd)

Figure 4.16: Precipitation of silver chloride by mixing solutions of silver nitrate and potassium chloride. The K+ and NO 3 - ions remain in solution.

Copyright © Houghton Mifflin Company. All rights reserved.4a–19 Figure 4.17: The reaction of KCl(aq) with AgNO 3 to form AgCl(s).

Copyright © Houghton Mifflin Company. All rights reserved.4a–20

Copyright © Houghton Mifflin Company. All rights reserved.4a–21 Stoichiometry Steps for reactions in solution.

Copyright © Houghton Mifflin Company. All rights reserved.4a–22 Performing calculations for acid-base reactions.

Figure 4.18a: The titration of an acid with a base.

Figure 4.18b: The titration of an acid with a base.

Figure 4.18c: The titration of an acid with a base.

Copyright © Houghton Mifflin Company. All rights reserved.4a–26 Figure 4.19: The reaction of solid sodium and gaseous chlorine to form solid sodium chloride.

Copyright © Houghton Mifflin Company. All rights reserved.4a–27

Figure 4.20: A summary of an oxidation- reduction process, in which M is oxidized and X is reduced.