Theory:

We know the change in colour when soap reacts with the turmeric solution.
Now let's see what is neutralisation reaction?
A chemical reaction occurs when an acid and a base are combined. The process is referred to as neutralisation. Neutralisation is an exothermic reaction, which means that the reaction mixture heats up.
In neutralisation reaction, a new substance formed which is known as salt. The salt produced here can be either acidic, basic or neutral.

Acid + BaseHeatevolvedSalt + Water
 
The reaction between the Hydrochloric acid and Sodium hydroxide gives Salt and Water as a product. It is one of the example for neutralisation reaction.
 
HCl+NaOHHeatevolvedNaCl+H2O
Example:
Let us now make our own rocket with vinegar and baking soda!
  
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Step 1: Take a piece of paper and add some baking soda.
 
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Step 2: Roll it up tightly and secure the ends.
 
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Step 3: Fill an empty bottle with vinegar.
 
Step 4: Place your baking soda paper roll in the bottle, cork it, shake it up, and drop it on the ground easily.
 
Step 5: See how far your rocket can fly!

Observation: Baking soda \(NaHCO_3\) is sodium bicarbonate, which has a sodium atom, a hydrogen atom, an oxygen atom, and a carbon atom in each molecule.
 
Vinegar contains acetic acid \(CH_3COOH\), which has a hydrogen atom and an acetate ion in each molecule.
 
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Result: When acetic acid \(CH_3COOH\) and baking soda \(NaHCO_3\) are combined, the hydrogen atom in the acetic acid joins the hydrogen and oxygen atoms in the baking soda to form a molecule of water, while the acetate ion binds to the sodium atom to form sodium acetate.
 
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The carbon dioxide \(CO_2\) molecule is now free of all other chemical bonds and will escape as a gas.