What gas is produced by the reaction of magnesium and HCl as evidenced by the "poof" test?
acids react with active metals to yield hydrogen gas and a salt.
In this case, the gas produced by the reaction of magnesium and HCl is hydrogen gas (H2). This can be confirmed by performing the "poof" test, which is a common method to identify the presence of hydrogen gas.
To perform the "poof" test, you would need to set up the following experiment:
1. Take a small amount of the reaction mixture (magnesium and HCl) in a test tube.
2. Attach a rubber tubing to the test tube so that the open end of the tubing is placed just above the solution.
3. Place a lit splint or a burning matchstick near the end of the rubber tubing and observe.
If hydrogen gas is being produced, it will rise upwards through the rubber tubing. As the lit splint or matchstick reaches the end of the tubing, it will produce a small "poof" sound along with a brief flame, indicating the presence of hydrogen gas.
It's important to note that when performing any experiment, especially ones involving chemical reactions and gases, all necessary safety precautions should be taken, such as wearing protective goggles and working in a well-ventilated area.