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Transcript of Chemistry 05/02/2017
May 2nd, 2017
Class Activity 29: Measuring pH
Class Activity 28
1. When an acid is dissolved in water, what ion is produced?
2. Is HCl an acid or a base?
3. Is Vinegar an acid or a base?
4. When a base is dissolved in water, what ion is produced?
5. Is NaOH an acid or a base?
6. Is baking soda an acid or a base?
7. Draw and label the pH scale.
8. Explain the difference between a strong acid or base and a weak acid or base.
1. Use a digital pH meter to classify vinegar and a solution of baking soda in water as acidic or basic. Check several times using different pH meters.
2. Add red cabbage extract to the vinegar and baking soda solution. Record your observations.
4. Describe how you could use red-cabbage extract to determine if an unknown substance is acidic or basic.
5. Use red cabbage extract to determine if an unknown substance (anything you want to test in the classroom) is acidic, basic, or neutral. Record your results, and explain your reasoning.
Professor Dave - pH and pOH at 6:45