Changing+pH

Name: Date: STEM Middle Academy – 8th Grade Science - Mr. Condon Block: Changing pH Lab Question: What will happen to the pH of a **basic** chemical compound if a mild **acid** is allowed to react with it? Hypothesis: Procedure: 1. Gather Materials: large beaker, graduated cylinder, Litmus paper, stirring rod, 5 grams of Sodium bicarbonate (NaHCO3), 5ml of Acetic Acid (HCH3CO2), 20 ml of water (HOH), 2. Add sodium bicarbonate to large beaker, mix with water. 3. Measure and record pH. 4. Measure pH of acetic acid. Record. 5. Add acetic acid to sodium bicarbonate – water mixture. 5. Does a reaction occur? Explain. 6. Measure and record pH.

Data Analysis: 1. Is Sodium bicarbonate an acid or base? Use evidence from your lab as proof. 2. Does adding acid change sodium bicarbonate’s pH? What evidence do you have to support your claim? 3. What do you suppose would happen if a stronger or weaker acid was added to the sodium bicarbonate – water mixture? Use the back of the page or additional paper to complete your answer.