Question

In a test tube containing 4 ml of sodium hydroxide solution two drops ofphenolphthalein and then hydrochloric acid is added drop by drop. State your observations and state the kind of reaction taking place.

Answer 1

Answer: The colour of the final mixture when added HCl to it

The colour (pink colour) will disappear.

the reaction between an acid and a base is known as neutralisation in this reaction and acid neutralizes the effect of acid and a base this reaction result in the formation of salt and water and energy in the form of heat is evolved.

Explanation: Fill half in test tube HCl and two drops of phenolphthalein to it start it continuously. next add Sodium Hydroxide till pink colour appears now add one drop of HCl the pink colour disappears so it is evident that when a solution is acidic it gives no colour this shows that neutralization reaction has occurred

Answer 2

When HCl is added drop by drop the colour (pink colour) will disappear.

Neutralisation

• Neutralisation is the reaction between an acid and a base.
• An acid counteracts the effects of an acid and a base in this reaction, resulting in the formation of salt and water as well as the release of energy in the form of heat.

Experiment:

• Start by filling half of the test tube with HCl and two drops of phenolphthalein and running it constantly.
• Next, add Sodium Hydroxide until a pink colour appears, then add one drop of HCl until the pink colour vanishes, demonstrating that when a solution is acidic, no colour is produced, indicating that a neutralisation reaction has happened.

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