Assignment 7

1.Student directions pH scale activity 1: Introduction to pH

 

Directions: Use specific examples to demonstrate each of the following learning goals.

1. Determine if a solution is acidic or basic using
1. pH: 
2. molecular representation
3. Hydronium/Hydroxide concentration

 A. In the simulation using the device ( I assume it's some sort of pH reader) I was able to measure exactly how acidic or basic a liquid was. The pH scale helped me figure out what liquids were acids and which were bases. If you don't have a device

B. By using water and examining the molecular formation of the acid being tested, you can notice distinct characteristics that tell you how strong an acid or a base is. For example, strong acids break apart in water creating H+ and A- ions.
C. Acidity is determined by the concentration of Hydronium in the given solution. the same goes with bases but with hydroxide concentrates. Both of these measurements can determine if a solution is basic or acidic.  

2. Relate liquid color to pH

The colors many times can give away weather a liquid is acidic or basic. Many times acids are clear liquids while bases are commonly are clouded liquids. For example milk is an easy base to recognize while battery acid is an easy acid to recognize. Using a universal indicator solution will change acids from green to red, while bases will turn purple. 

3. Predict if dilution and volume will increase, decrease or not change the pH

These both will increase the pH. For example, in the simulator, adding water to an acid made the solution less acidic on the pH scale, which in turn increased the pH. 

4. Organize a list of liquids in terms of acid or base strength in relative order with supporting evidence.

Acids

1. Battery Acid 

2. Soda 

3.Chicken Soup 

Bases

1.Drain Cleaner

2.Hand Soap 

3.Blood 

Both of these lists were composed using information retrieved from the simulation.

5. Write the water equilibrium expression. Describe how the water equilibrium varies with pH.

Kw, is 1.01 × 10-14 at 25 °C.  The equation will change with varying H+ ions and Hydroxide ions found in both acids and bases. 

Click Questions 

1. False. The best way to know if a solution is either basic or acidic is by properly testing it with a pH reading device, litmus paper , or the pH equation.

2.D, Both solutions over 7 pH are bases.

3.C, The liquid consists mostly of H+ Ions 

4.C. C had the most H30+ ions 

5. B. Had the most H+ ions out of the three

6.A. Water being added decreases acidity, which makes the pH go up.

7. B, More water will decrease the liquids base.

8. ABC. A is the lowest pH (Acid) and the other two than increase the pH as bases.

9. CBA. The higher the H+ ions in a liquid the lower the pH 

10. A. The solution wasn't at 7 so something was added to make it more basic.

Questions:

1. Very concentrated

2. Strong Electrolyte

3. Weak electrolyte 

4. Lower

5.Decreases 

6. Increases 

7.Decreases 

8. Increases 

9.Stays the same

10. Decreases 

11. Weak acid = 4.79/ Strong acid = 2.00

12. Strong acids will have a lower pH than weaker acids, so the results make sense.