Ethanoic Acid Acetic Acid Properties and Uses - UNSOLVED PRACTICE SET
Chapter: Carbon and Its Compounds | Topic: Ethanoic Acid Acetic Acid Properties and Uses
ETHANOIC ACID ACETIC ACID PROPERTIES AND USES - UNSOLVED PRACTICE SET
Topic: Ethanoic Acid Acetic Acid Properties and Uses
Multiple Choice Questions
Q1. The common name of ethanoic acid is:
- Formic acid
- Acetic acid
- Citric acid
- Lactic acid
Q2. The molecular formula of ethanoic acid is:
- CH₃OH
- HCHO
- CH₃COOH
- C₂H₅OH
Q3. Ethanoic acid turns blue litmus paper:
- Red
- Green
- No change
- Yellow
Q4. When ethanoic acid reacts with sodium hydrogen carbonate, the gas evolved is:
- Hydrogen
- Oxygen
- Carbon dioxide
- Nitrogen
Q5. The melting point of pure ethanoic acid is approximately:
- 0°C
- 17°C
- 100°C
- 78°C
Q6. Which of the following is NOT a use of ethanoic acid?
- As a food preservative (vinegar)
- In the manufacture of plastics
- As a coagulating agent in rubber production
- As a fuel in rockets
Short Answer Questions
Q7. Why does pure ethanoic acid freeze during winter in cold countries, earning it the name 'glacial acetic acid'?
Q8. Write the chemical equation for the reaction between ethanoic acid and sodium hydroxide. Name the salt formed.
Q9. How can you distinguish between ethanol and ethanoic acid using a simple chemical test?
Q10. What happens when ethanoic acid is heated with ethanol in the presence of concentrated sulphuric acid? Name the reaction and the product.
Q11. Your mother uses vinegar (5-8% acetic acid solution) to clean tarnished copper vessels in the kitchen. Why does vinegar remove the green coating (verdigris) from copper? Write the chemical equation.
Q12. List two physical properties and two chemical properties of ethanoic acid.
Long Answer Questions
Q13. Describe the physical and chemical properties of ethanoic acid. Write chemical equations for its reactions with:
(a) Sodium metal
(b) Sodium hydroxide
(c) Sodium carbonate
(d) Ethanol
Also mention three common uses of ethanoic acid.
Q14. Explain why ethanoic acid is a weak acid compared to mineral acids like HCl. Describe an experiment to show that ethanoic acid is weaker than hydrochloric acid using a conductivity test or pH paper.
Q15. During a cooking session at home, your mother asks you to prepare a salad dressing using vinegar, olive oil, and herbs. She also uses baking soda (sodium hydrogen carbonate) while making a cake.
(a) Why does vinegar have a sour taste? What chemical property is responsible?
(b) What happens when vinegar reacts with baking soda? Write the equation.
(c) Why does the cake rise when baking soda and an acid are mixed?
(d) Why is ethanoic acid preferred over strong mineral acids in food preparations?
Numerical / Application-Based Problems
Q16. The molecular formula of ethanoic acid is CH₃COOH.
(a) Calculate its molecular mass. (Atomic masses: C = 12, H = 1, O = 16)
(b) Calculate the percentage of carbon in ethanoic acid.
(c) How many moles of ethanoic acid are present in 12 g of the acid?
Q17. A vinegar bottle contains 500 mL of 5% (v/v) acetic acid solution.
(a) Calculate the volume of pure ethanoic acid in the bottle.
(b) If the density of ethanoic acid is 1.05 g/mL, calculate the mass of ethanoic acid present.
(c) Why is pure ethanoic acid not used directly for cooking?
Q18. In a neutralization reaction, 6 g of ethanoic acid reacts completely with sodium hydroxide.
CH₃COOH + NaOH → CH₃COONa + H₂O
(a) Calculate the mass of sodium ethanoate (CH₃COONa) produced. (Molar masses: CH₃COOH = 60 g/mol, NaOH = 40 g/mol, CH₃COONa = 82 g/mol)
(b) Calculate the mass of sodium hydroxide required.
(c) Why is this reaction called a neutralization reaction?