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Experiment 17: Study reaction of base with metal

Experiment 17: Study reaction of base with metal

Objective

To study reaction of base with metal

Materials required:

  • Sodium hydroxide solution
  • Some pieces of aluminium metal
  • red and blue litmus papers
  • three test tubes
  • candle

Procedure:

  • Take a small piece of aluminium metal and place it in a clean and dry test tube
  • Add about 5 mL sodium hydroxide solution in it
  • Observe the changes in the test tube

Findings:

    Test

    Activity

    Observation

    Color

    Look at the colour of the gas liberated

    Colorless

    Smell

    Fan the gas gently towards your nose

    Odorless

    Litmus test

    Bring moist blue and red litmus papers near to the mouth of the test tube

    No change

    Combustion test

    Bring a lighted candle near to the mouth of the test tube

    Burn with pop sound

Conclusions:

  • The reaction between sodium hydroxide solution and hydrochloride acid is exothermic
  • Reaction between barium hydroxide solution and ammonium chloride is endothermic.

Theory:

  • When alkali (base) reacts with metal, it produces salt and hydrogen gas
  • Example: Sodium hydroxide gives hydrogen gas and sodium zincate when reacts with zinc metal. Sodium aluminate and hydrogen gas are formed when sodium hydroxide reacts with aluminium metal.

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