Question

create a mind map on the topic neutralisation reaction
grade 7

Answer 1

Answer:

The reaction of an acid with a base to give salt, water and heat is called neutralisation.

Example: Hydrochloric Acid + Sodium Hydroxide → Sodium Chloride + Water + Heat

HCl + NaOH → NaCl + H2O + Heat

The heat evolved in the neutralisation reaction raises the temperature of the reaction mixture.

Example: During the mixing of dilute sulphuric acid with potassium hydroxide, the test tube heats up.

Answer 2

Answer:

Neutralisation:

In a neutralisation reaction, two new substances, salt and water, are formed. The salt formed during a neutralisation reaction depends on which acid and which base are reacted with each other. Sodium hydroxide is a base and hydrochloric acid is an acid.

Neutralization Reaction Examples

Formation of Sodium Chloride (Common Salt):

HCl + NaOH → NaCl + H2O

Titration methods using phenolphthalein.

Application of Neutralization Reaction

1. Titration methods:

The method of chemical titration is employed to find unknown concentrations of acids or bases by finding their neutralization point. To find the point where the neutralization happens, we use a pH indicator or pH meter. With the help of simple stoichiometric calculations and knowledge of the volume and molarity of the known quantity, the molarity of the unknown particle can be found out.

2. Wastewater treatment:

Most of the waste that comes in the form of industrial effluents have their fair share of toxicity which will be harmful to our environment. Thus we need to neutralize their toxicity before they can be thrown out. Based on the application, different chemicals are used. Some common examples are Sodium Bicarbonate, Magnesium Hydroxide, Calcium Oxide, Calcium Carbonate.

3. Nanomaterial synthesis:

reduction of metal precursors, the heat of a neutralization reaction is used.

4. In our digestive systems:

When food is moved between our stomach and intestines, the food needs to be neutralized. But for nutrients to be absorbed through the intestine walls an alkaline environment is required. Antacid bicarbonate is produced to create this favourable condition.

5. Controlling soil pH:

For optimal plant growth in any soil, there are certain conditions which are required. Some examples of materials mixed in the soil to neutralize it from acidity are:

Calcium Carbonate ( Limestone )

Calcium Hydroxide( Slaked lime )

Explanation:

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