Question

wtite the pro edure of the experiment to observe the reaction​

Answer 1

Answer:

Aim

Performing and observing the actions of-

Water on quicklime

Heat on ferrous sulphate crystals

Iron nails dipped in copper sulphate solution

Reaction between sodium sulphate and barium chloride solution

On the following reactions-

Combination reaction

Decomposition reaction

Displacement reaction

Double displacement reaction

Experiment 3(A) – Combination

Materials Required

Quick lime (Calcium oxide)

Borosil beaker

Glass rod

Distilled water

Dropper

Test tube

Litmus paper strips

Theory

When calcium oxide is mixed in water it dissolves and forms calcium hydroxide (basic in nature). During this reaction, a lot of heat is liberated and therefore, it is called an exothermic reaction. The equation is as follows:

CaO(s) + H2O(l) → Ca(OH)2 (aq) + Heat ………(1)

Due to the basic nature of calcium hydroxide, it turns red litmus paper blue in colour. When carbon dioxide gas is passed through the calcium hydroxide the solution turns milky white.

Ca(OH)2 (aq) + CO2 → CaCO3 + H2O

In the reaction (1) slaked lime is formed by combining two products viz, quick lime and water. Therefore, when two or more than two substances combine to give a single product it is termed as combining reaction. The reactions accompanied by the evolution of heat are called exothermic reactions.

Procedure

Wash a borosil beaker with distilled water and dry it.

Take a small amount of calcium oxide (quick lime) and slowly add water to it.

Wash and take a clean glass rod to stir the mixture of quick lime and water.

Touch the beaker carefully from outside.

Observe the change.

With the help of dropper take a few drops of the mixture from the beaker and place it on red and blue litmus paper strips.

Wait and observe

Explanation: