### Theory:

Let us see how bases react with metal with the help of some activities:
Important!
Caution: The experiment should be performed in the presence of a teacher.
Example:
Activity 1: The experiment aims to see how do bases react with metals.

Apparatus required:
• Test tube
• Delivery tube
• Glass tub
• Candle
• Zinc granules
• Water
• Soap
• Sodium hydroxide $$NaOH$$
Step 1: Take a test tube and add $$2mL$$ of sodium hydroxide (NaOH\) solution and add a few pinches of zinc granules.

Step 2: Heat the test tube for few minutes until it is warm.

Step 3:
• Observe the test tube for any changes.
• Fit the test tube mouth with a cork.
• Attach one end of the delivery tube to it.
Step 4: The other end of the delivery tube should be placed inside the glass tube filled with a soap solution.

Bases on reaction with metals

Observation: The liberation of gas from the reaction passes through the soap tub forming bubbles.

Result: Since the hydrogen gas does not dissolve in a soap solution, it forms hydrogen gas bubbles
To prove that the formed gas is hydrogen, we can do a small test using a candle.

Take a burning candle near a gas-filled bubble that is formed from the above reaction. We can find the burning of hydrogen gas with a pop sound and turns the candle off.

Final observation:
• A colourless and odourless gas is formed.
• The formed gas does not dissolve in a soap solution, as a result bubbles are formed.
• The liberated gas found to be as hydrogen, which produces a pop sound and turns off the candle.
Conclusion:
• $$Sodium hydroxide + Zinc\rightarrow Salt + Hydrogen gas$$
• Therefore, the chemical reaction can be written as  $$2NaOH + Zn\rightarrow Na_2ZnO_2+ H_2$$
Here the formed salt is sodium zincate with the chemical formula $$Na_2ZnO_2$$.
Therefore, the overall reaction can be written as

$$Base+ Metal \rightarrow Salt + Hydrogen gas$$
We know that a chemical reaction occurs between metal and a base. But, it is not possible with all metals as most of the metals have the same characteristics as that of a base.
Note: If the cation of the base is less reactive than the metal, the reaction is possible.