4 If a lighted splint is put into carbon dioxide, the flame goes out. a) Why is this not a very
good test for carbon dioxide? b) Describe a more suitable test for carbon dioxide.
Answers
Explanation:
Explanation:A splint (or spill) is a simple piece of equipment used in scientific laboratories. Splints are typically long, thin strips of wood, about 6 inches (15 cm) long and ¼ inch (6 mm) wide, and are consumable but inexpensive. They are typically used for tasks such as lighting bunsen burners, as the length of the splint allows a flame to be lit without risk to the user's hand, should the burner flare back. Another use for splints are chemical identification of various gases, and splints are also used to teach simple chemical principles in schools.
a) The extinguishing of a flame when a lighted splint is put into carbon dioxide is not a very good test for carbon dioxide because this reaction can occur with other gases as well, such as nitrogen or sulfur dioxide, that do not have the same chemical properties as carbon dioxide. The reaction of a flame being extinguished upon contact with a gas is not a specific enough indicator to identify carbon dioxide.
b) A more suitable test for carbon dioxide would be the reaction with a limewater solution. Limewater is a solution made by dissolving calcium hydroxide (Ca(OH)2) in water. When carbon dioxide is bubbled through limewater, the solution will turn cloudy, indicating the presence of carbon dioxide. This reaction is specific to carbon dioxide, as the other gases mentioned above will not cause the limewater to turn cloudy. Additionally, the reaction produces a solid, calcium carbonate (CaCO3), which can be collected and identified, providing further evidence of the presence of carbon dioxide.
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