5. Which one of the following can be used as an acid-base indicator for a visually impaired student? a) Litmus b) Turmeric c) Vanilla essence d) Petunia leaves. 6. a) Acids and bases that you encounter in day-to-day life (any 3 from each). b) One strong acid and one weak acid. 7. a) Acid present in car batteries b) An antacid.
Answer (1)
Which one of the following can be used as an acid-base indicator for a visually impaired student? The best choice for a visually impaired student would be c) Vanilla essence . While most acid-base indicators change color, which may not be useful for visually impaired students, vanilla essence changes its smell when it reacts with acids and bases. This change in odor can provide an alternative way to detect an acid or a base through the sense of smell.
a) Acids and bases that you encounter in day-to-day life (any 3 from each). Acids:
Vinegar (acetic acid): Commonly used in cooking and household cleaning.
Citric acid: Found in citrus fruits like lemons and oranges.
Lactic acid: Present in sour milk products like yogurt and cheese.
Bases:
Baking soda (sodium bicarbonate): Used in baking and as a cleaning agent.
Ammonia: Found in household cleaners.
Soap: Made from fatty acids and a strong base like lye.
b) One strong acid and one weak acid.
Strong Acid: Hydrochloric acid (HCl), commonly used in industry and in the stomach for digestion.
Weak Acid: Acetic acid (CH₃COOH), which is found in vinegar.
a) Acid present in car batteries The acid found in car batteries is sulfuric acid (H₂SO₄) . It is a strong acid that reacts with lead plates in the battery to produce electrical energy.
b) An antacid An antacid is a substance that neutralizes stomach acid. A common example is calcium carbonate (CaCO₃) , which is found in tablets like Tums or Rolaids.
