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Acids and Base Review: Ch 14-15 Trish Loeblein phet.colorado.edu Loeblein’s Chemistry PhET clicker questions.

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Presentation on theme: "Acids and Base Review: Ch 14-15 Trish Loeblein phet.colorado.edu Loeblein’s Chemistry PhET clicker questions."— Presentation transcript:

1 Acids and Base Review: Ch Trish Loeblein phet.colorado.edu Loeblein’s Chemistry PhET clicker questions

2 Icons for Acid Base Solutions

3 1.Order the solutions from lowest to highest pH. A. X

4 2.Order the solutions from lowest to highest pH. A. X

5 3. Which image is from a strong acid? A.X B. Y C. Z D. more than one E. none X Y Z

6 4. Which image is from a weak base? A.X B. Y C. Z D. more than one E. none X Y Z

7 5. Strong acids have lower pH than weak acids. A. True B. False Usually!

8 A. Always True B. Always False C. Sometimes True 7. A solution with [H 3 O + ] =.1 M contains a stronger acid than a solution [H 3 O + ] =.001 M. It depends of if it is a strong or weak acid, or on how much ionization occurs

9 9. What ALWAYS distinguishes a weak acid from a strong acid? A.A weak acid doesn’t dissociate as much in water; strong acids completely react. B.A weak acid is more dilute than a strong acid. C.A weak acid has a higher pH than a strong acid.

10 Which equation shows a strong base? A B C D E

11 1. The color of a solution on its own identifies if it is an acid, base, or neutral solution. A.True B. False C.Pink are base and clear are acid

12 2. Which solution is basic? ABC D. More than one E. None

13 3. Which solution is acidic? ABC D. More than one E. Difficult to tell

14 4. Which solution is basic? A B C D. More than one E. None

15 5. Which solution is acidic? ABC D. More than one E. None

16 6. How will adding water effect the pH? A.Increase the pH B.Decrease the pH C.No pH change Becomes less acidic= increase pH more water lessens the acidity, so pH goes up

17 7. How will adding equal amount of water effect the pH? A.Increase the pH B.Decrease the pH C.The pH will be cut in half D.No pH change more water lessens the basicity, so pH goes down, from 10 to 9.7, but not by 2 (log scale)

18 8. What is the order from most acidic to most basic? ABC A.A B C B.A C B C.B A C D.C B A E.C A B

19 9. What is the order from most acidic to most basic? AB C A.A B C B.A C B C.B A C D.C B A E.C A B

20 The [H 3 O + ] is 1.0x What is the pH and will it be an acidic or basic solution? 9, basic

21 Acid, base, neutral? 1.Proton donor 2.Electron acceptor 3.Produced OH - ions in solution 4.Proton acceptor 5.pH of 7 6.Conducts electricity 7.Reacts with magnesium 1.Acid 2.Acid 3.Base 4.Base 5.neutral 6.Both 7.Acid

22 Acid, base, neutral? 1.Turns litmus paper blue 2.Turns pH paper green 3.Turns phenolphthalein pink 4.Turns litmus paper pink 1.Base 2.Neutral 3.Base 4.acid

23 Name the following. 1.H 2 CO 3 2.HF 3.Ba(OH) 2 Carbonic acid Hydrofluoric acid Barium Hydroxide

24 A strong acid is… A.very concentrated B.exists primarily as ions

25 A weak base is a… A.nonelectrolyte B.Weak electrolyte C.Strong electrolyte.

26 A water is a A.Nonelectrolyte B.weak electrolyte C.strong electrolyte.

27 At the same concentration (Molarity) a strong acid will have a __________ pH as a weak acid. A.Higher B.Lower C.the same

28 As concentration of a weak acid increases, the pH A.Increases B.Decreases C.remains constant.

29 As the concentration of a weak acid increases, the number of ions A.Increases B.Decreases C.Remains constant

30 As the concentration of a weak acid increases, conductivity A.Increases B.Decreases C.Remains constant

31 As the strength of a weak acid increases, the proportion of ions to molecules A.Increases B.Decreases

32 As the strength of a weak acid increases, the conductivity A.Increases B.Decreases C.remains constant

33 Acid Base SolutionsAcid Base Solutions: Strength and Concentration by Trish Loeblein July 2011 Strength and Concentration Learning goals: Students will be able to 1.Generate or interpret molecular representations (words and/or pictures) for acid or base solutions 2.Provide or use representations of the relative amounts of particles in acid or base solutions to estimate strength and/or concentration 3.Use common tools (pH meter, conductivity, pH paper) of acid or base solutions to estimate strength and/or concentration Some materials adapted from an activity by Lancaster /LangdonLancaster /Langdon

34 pH Scale: qualitative learning goals 1.Determine if a solution is acidic or basic using a)pH b) H 3 O + /OH - ratio molecular size representation c) Hydronium/Hydroxide concentration 2.Relate liquid color to pH. 3.Predict if dilution and volume will increase, decrease or not change the pH 4.Organize a list of liquids in terms of acid or base strength in relative order with supporting evidence. 5.Write the water equilibrium expression. Describe how the water equilibrium varies with pH.


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