CO₂와 석회수 시험
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수산화칼슘으로 이산화탄소 검출하기
목표
탄산염과 산의 반응으로 이산화탄소 기체를 발생시키고 석회수 시험으로 그 존재를 확인한다.
배경
When baking soda (sodium bicarbonate) reacts with vinegar (acetic acid), CO₂ gas is produced. Bubbling this gas through limewater (calcium hydroxide solution) produces a characteristic white milky precipitate of calcium carbonate, confirming the presence of CO₂.
안전 경고
- Limewater is mildly irritating — avoid eye contact
- CO₂ is an asphyxiant in large quantities — work in ventilated area
필수 개인 보호 장비
재료
-
Baking soda (NaHCO₃) (10 g)
-
White vinegar (50 mL)5% acetic acid
-
Limewater (Ca(OH)₂ solution) (100 mL)Clear, saturated
장비
실험 절차
Pour 100 mL of clear limewater into a test tube or small beaker.
Place 10 g of baking soda in the Erlenmeyer flask.
Add 50 mL of vinegar to the flask. Quickly insert the stopper with delivery tube.
Direct the delivery tube into the limewater. Bubble the CO₂ through for 2-3 minutes.
Observe the limewater turning milky white as calcium carbonate precipitate forms.
Continue bubbling. If enough CO₂ passes through, the solution may turn clear again as soluble Ca(HCO₃)₂ forms.
예상 결과
The clear limewater turns milky white due to CaCO₃ precipitation: Ca(OH)₂ + CO₂ → CaCO₃ + H₂O. With excess CO₂, the milkiness clears: CaCO₃ + CO₂ + H₂O → Ca(HCO₃)₂.
정리
Neutralize remaining vinegar solution. Dispose of limewater down the drain. Rinse all equipment.
세부 정보
- 카테고리
- Gas Laws
- 난이도
- Beginner (Middle School)
- 소요 시간
- 20 분
- 예상 비용
- $5.00
- 단계
- 6
- 재료
- 3