Chapter Name: Acids, Bases and Salts
Activity Name: Reaction with other metals in Acids, Bases and Salts
In this experiment, we will observe the reaction between zinc metal and sodium hydroxide solution. The goal is to observe the evolution of hydrogen gas and the formation of sodium zincate as a salt.
- Zinc metal granules
- Sodium hydroxide (NaOH) solution (10 ml)
- Test tubes
- Heat source (e.g., Bunsen burner or hot plate)
- Rubber stoppers or corks for test tubes
- Delivery tube
- Water trough or container
- Gas collecting jar
- Safety goggles and lab coat
Step by Step Procedure:
- Place a few granules of zinc metal in one of the test tubes.
- Add 10 ml of sodium hydroxide (NaOH) solution to the test tube containing the zinc metal.
- Gently warm the contents of the test tube using a Bunsen burner or hot plate. Take necessary safety precautions while handling the heat source.
- Set up a gas collection system by inserting one end of a delivery tube into the rubber stopper or cork of the test tube.
- The other end of the delivery tube should be placed under the mouth of a gas collecting jar, which is submerged in a water trough or container.
- Allow the reaction to proceed and observe the gas collected in the gas jar.
- Hydrogen gas (H2) is evolved during the reaction.
- Sodium zincate is formed as a salt.
- Wear safety goggles and a lab coat to protect your eyes and clothing.
- Handle sodium hydroxide (NaOH) solution with care as it is caustic and can cause burns. Avoid direct contact with skin and eyes.
- Perform the experiment in a well-ventilated area or under a fume hood to avoid inhaling any fumes.
- Use a heat source with caution, and always turn it off when not in use.
- Handle the gas collecting jar with care, as hydrogen gas is flammable.
- Dispose of any leftover chemicals and materials properly according to the guidelines.
Lesson Learnt from Experiment:
The experiment demonstrates the reaction between zinc metal and sodium hydroxide solution, resulting in the evolution of hydrogen gas and the formation of sodium zincate. It also highlights that not all metals react with sodium hydroxide in the same way, indicating that the reactivity of metals with bases can vary.