Question 49
Carry out these steps to test for the gas produced in a reaction.
1. Use a dropper to add dilute hydrochloric acid into a test tube to a height of about 2 cm.
2. Carefully add a 10–15 mm piece of magnesium ribbon to the test tube. Observe what happens.
3. After about 30 seconds, hold a lighted splint at the mouth of the test tube (Figure 9.18). Be sure that you do not have your head above the test tube and the test tube is not pointing at anyone.
Would the results have been different if you had waited until the fizzing stopped before holding the lighted splint at the mouth of the test tube?
1. Use a dropper to add dilute hydrochloric acid into a test tube to a height of about 2 cm.
2. Carefully add a 10–15 mm piece of magnesium ribbon to the test tube. Observe what happens.
3. After about 30 seconds, hold a lighted splint at the mouth of the test tube (Figure 9.18). Be sure that you do not have your head above the test tube and the test tube is not pointing at anyone.
Would the results have been different if you had waited until the fizzing stopped before holding the lighted splint at the mouth of the test tube?
