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Unit 11 – Acid Base Indicator Lab

Name: __________________________ DUE: ___________________________

Learning Target: I can use indicators to determine the general pH of a solution.

Materials:

250 mL beaker (or larger) plastic spoon box of baking soda

150 mL of vinegar 5-10 drops of universal indicator

Pre – lab questions:

1. List three facts about vinegar.

2. List three facts about baking soda.

3. What happens when you mix baking soda and vinegar together? Explain why this happens.

4. What is the purpose of indicators?

Directions:

1. Obtain and clean a 250 mL beaker.

2. Put on googles!

3. Grab a box of baking soda and two plastics spoons.

4. Measure out approximately 150 of vinegar into your beaker.

5. Add a pipette stem of universal indicator to your vinegar.

Observations:

6. Add half of a teaspoon of baking soda to your beaker.

Observations:

7. Repeat step 6 10 times and record your observations below.

|Trial |Observations |

|Trial 2 | |

|Trial 3 | |

|Trial 4 | |

|Trial 5 | |

|Trial 6 | |

|Trial 7 | |

|Trial 8 | |

|Trial 9 | |

|Trial 10 | |

|Milk of | |

|Magnesia | |

8. Have Ms. Knierim check your solution before dumping down the drain.

9. Pour 50 mL of Milk of Magnesia into your clean beaker and add 5 – 10 drops of universal indicator.

10. Clean your beaker out with lots of water.

Post – lab questions:

1. Was your final solution unsaturated saturated supersatured

2. Was your final solution acidic basic

How did you know if your solution was acidic/basic? ___________________________________

3. What is the advantage of using a universal indicator instead of phenolphthalein?

4. Use colored pencils and create an approximate scale of the pH scale for a universal indicator knowing the following information:

a. the pH of vinegar is approximately 3

b. the pH of the baking soda is approximately 8.5

c. the pH of milk of magnesia is 10.5

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