In tube 1 dilute acid is added to a carbonate and in tube 2 dilute acid is added to magnesium. Both tubes fizz. A lighted splint held over tube 2 gives a sq...
Question 1 Report
In tube 1 dilute acid is added to a carbonate and in tube 2 dilute acid is added to magnesium. Both tubes fizz. A lighted splint held over tube 2 gives a squeaky pop. Which gas is produced in tube 2?
Answer Details
Both tubes fizz, but the gases are different and the splint test tells them apart. Tube 2 contains a reactive metal and an acid, and a reactive metal displaces hydrogen from acid: \(\mathrm{Mg(s) + 2HCl(aq) \rightarrow MgCl_2(aq) + H_2(g)}\). Hydrogen is the gas that burns with a squeaky pop when a lighted splint is held over it, so hydrogen is the gas made in tube 2.
Tube 1 holds a carbonate and acid, which gives carbon dioxide. That gas puts a lighted splint out and turns limewater milky, so it can never pop. Oxygen relights a glowing splint instead of popping, and chlorine is not a product here.
Match each test to its gas: pop for hydrogen, relight for oxygen, limewater for carbon dioxide.
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