Question

explain an activity to demonstrate neutralization​

Answer 1

Neutralisation reaction is when acid reacts with base and produce salt and water. Take 5 mL of HCl in a conical flask A neutralisation reaction will take place as NaCl will be formed

Answer 2

$\:\:\:\:\:\:\:\:\:\:\large\underline{\boxed{\sf{Neutralization\:reaction}}}$

$\normalsize\star\underline{\bf{Aim:}}$

To demonstrate neutralization reaction

$\normalsize\star\underline{\bf{Materials\: required:}}$

• Test tubes
• Dropper
• Phenolphthalein indicator
• Dilute hydrochloric acid
• Dilute sodium hydroxide solution

$\normalsize\star\underline{\bf{Method:}}$

1. Take 5 ml of dilute sodium hydroxide in a test tube.
2. Add 2 drops of phenolphthalein indicator to it. Shake the test tube well.
3. The colour of the solution becomes pink.
4. Now, add dilute hydrochloric acid dropwise and shake the test tube well. The pink colour slowly disappears.
5. Now again add a drop of dilute sodium hydroxide solution and shake the test tube well to mix the solution.
6. The pink colour appears again.

$\normalsize\star\underline{\bf{Observation:}}$

‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎The pink colour of the solution disappears if dilute hydrochloric acid is added to it. And if we touch the test tube, it feels warm.

$\normalsize\star\underline{\bf{Conclusion:}}$

‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎Phenolphthalein indicator gives a pink colour when the solution is basic. When the solution is acidic, it remains colourless. When an acidic solution is mixed with a basic solution, both the solutions neutralize the effect of each other. Therefore, we can conclude the topic - the reaction that takes place when an acid and a base react to each other and forms salts as by-product with the evolution of heat is called neutralization reaction.

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