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CaCO₃ + Dilute HCl Thistle funnel Dilute HCl Gas Collection Jar CHEMICAL REACTION CaCO₃(s) + 2HCl(aq) → CaCl₂(aq) + CO₂(g)↑ + H₂O(l)
HCl
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📋 Simple Steps

  • a. Place marble chips (CaCO₃) in Woulfe's bottle.
  • b. Insert thistle funnel through top cork securely.
  • c. Connect delivery tube from side outlet with airtight cork.
  • d. Position the delivery tube end into the gas collection jar.
  • e. Ensure all connections are airtight to prevent gas leakage.
  • f. Slowly pour dilute hydrochloric acid (HCl) through the thistle funnel to start the reaction.

⚠️ Precautions

  • 1. Wash all apparatus well.
  • 2. Use marble chips (pure calcium carbonate).
  • 3. Ensure airtight connections.
  • 4. Use dilute acid, not concentrated.
  • 5. Dip thistle funnel tip, but not delivery tube tip.
  • 6. Fill gas jar completely with water.
What Happens:

When dilute HCl reacts with marble chips (CaCO₃), brisk effervescence occurs. Carbon dioxide gas is produced and travels through the delivery tube directly into the collection jar. The colorless, odorless CO₂ gas fills the jar from bottom to top.

Chemical Reaction: CaCO₃(s) + 2HCl(aq) → CaCl₂(aq) + CO₂(g)↑ + H₂O(l)

Properties: CO₂ is heavier than air, colorless, and slightly soluble in water.