Question

Describe an activity to observe what happens when water is added to the quick lime taken in a beaker. State two important observations and name the type of reactions taking place.

Answer 1

Take a small quantity of calcium oxide (quick lime) in a beaker.Slowly add water to the quick lime taken in the beaker. Pour enough water so that the quick lime remains submerged in the water.Touch the beaker with fingers to note the temperature.Leave the beaker undisturbed for some time.Take a small quantity of clear solution from the beaker in a test tube and blow exhaled air into the lime water.
Drag the spatula containing quicklime over to the empty beaker to transfer the contents into it.Drag the beaker containing distilled water to pour it into the beaker containing quick lime.Wait for some time till the quick lime reacts with water to form a suspension of slaked lime.You can see that the thermometer shows an increase in temperature.View the inference by clicking on the inference icon.Click on the ‘Next’ button to go to the next process.You will get a clear solution of lime water as the suspension of slaked lime settles down at the bottom of the beaker.Now, drag the dropper and dip it in the beaker to suck lime water in it and then drag it towards the test tube to pour the lime water into it.Drag the cork with the bent tube towards the test tube to close it.Click on the ‘Next’ button to go to the next process.Click on the blow button to blow in exhaled air into the test tube containing lime water.The lime turns milky.View the inference by clicking on the inference icon.You can click on the ‘Reset’ button to redo the experiment.