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Extension Questions Question 1 Mark decided to investigate some household materials using the phenolphthalein solution. He placed 10 drops of each liquid or a small amount of solid (just enough to cover the tip of the spatula) in 2 mL of distilled water. Then he added 2 drops of the phenolphthalein solution and identified each substance as either an acid or a base, as shown in the table: Tube # Substance Color before Phenolphthalein Color after Phenolphthalein Conclusion 1 Baking soda Colorless Pink Base 2 White vinegar Colorless Colorless Acid 3 Salt Colorless Colorless Acid BI 4 Apple juice Pale yellow Pale yellow Acid 5 Shampoo Pale yellow Pale yellow Base 6 Window cleaner Pale blue Pale purple Base 7 Milk Slightly cloudy white Slightly cloudy white Acid 1. Can you draw any general conclusions about household materials based on his results? Can you find any problems with Mark's logic? B U T 2 Tz 0 Words F3 FA F6 F7 DII DD F8 F9 F10 # 4 5 8 CO O E R T V

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