INTRODUCTION

In this experiment, we will learn to determine the melting point of ice and the boiling point of water. Let us get started.

AIM

To find the boiling point of water and melting point of ice

OBJECTIVE A

To find the melting point of ice.

MATERIAL REQUIRED

1. Ice cube,

2. Filter paper,

3. Beaker,

4. Wire gauge,

5. Tripod stand,

6. Burner,

7. Thermometer,

8. Stirrer,

9. Clamp stand.

THEORY

1. The temperature at which the ice starts melting is called the melting point of water.

2. The solid form of water is ice.

3. The melting point of ice is 0°C.

4. At 0°C, ice converts into water.

PROCEDURE

1. Take out some ice cubes from the refrigerator and dry them with the help of filter paper.

2. Put the ice cubes in a beaker immediately.

3. Keep a wire gauge over a tripod stand and place the beaker over it.

4. Using a clamp stand, suspend a thermometer in the beaker.

5. Heat the setup and start stirring the ice cube continuously.

6. When the ice starts melting, measure this temperature and name it t1.

7. When the ice melted completely, measure this temperature and name it t2.

8. Write down your measurement in the given table.

OBSERVATION

Mean value of the temperature = (t1 + t2)/2

The melting point of ice = ……..°C.

RESULT

The melting point of ice = ……..°C

PRECAUTION

1. Dry the ice cubes before experimentation.

2. Continuous temperature should be maintained through stirring.

3. Thermometre should be dipped in ice cubes.

OBJECTIVE B

To measure the boiling point of water.

MATERIAL REQUIRED

1. Distilled water,

2. Boiling tube,

3. Rubber cork with two bores,

4. Delivery tube,

5. Clamp stand,

6. Piece of pumice stone,

7. Beaker,

8. Thermometre,

9. Burner.

THEORY

1. We know that water exists in three forms, i.e. liquid, solid(ice), and gas(water vapour).

2. The temperature at which the water starts boiling is known as the boiling point of water.

3. Water starts boiling at 100°C. Therefore its boiling point is 100°C.

PROCEDURE

1. In a boiling tube, take 50ml of water.

2. Put some pieces of pumice stone into it.

3. In the mouth of the boiling tube, fix a cork having two bores.

4. Fix a thermometer and a delivery tube in the two bores of cork.

5. Now, hold the beaker with the help of a clamp stand.

6. Place a beaker at the end of the delivery tube in order to collect water.

7. Heat the boiling tube.

8. Measure the temperature when water starts boiling and name it t1.

9. Measure the temperature when it becomes constant and name it the t2.

10. Write down your measurement in the given table.

OBSERVATION

Mean value of the temperature = (t1 + t2)/2

The boiling point of water = ……..°C.

RESULT

The boiling point of water= ……..°C

PRECAUTIONS

1. The water should have a normal temperature.

2. Water should be distilled.

3. Add pumice stone before heating the water.

4. Water should be heated by rotating the frame.

5. The bulb of the thermometer must be a little above the water.

CONCLUSION

In this way, we have learned to determine the boiling point of water and melting point of ice.

VIVA QUESTIONS WITH ANSWERS

Q.1 What do you mean by the melting point of water?

ANS. The temperature at which the ice starts melting is called the melting point of water.

Q.2 What do you mean by the boiling point of water?

ANS. The temperature at which the water starts boiling is known as the boiling point of water.

Q.3 Why should we use distilled water for the experiment?

ANS. Because the boiling point of distilled water is 100°C while the boiling point of impure water is different.

Q.4 What was the aim of our experiment?

ANS. To determine the boiling point of water and melting point of ice.

Q.5 Give one difference between boiling and evaporation?

ANS. Boiling occurs at a fixed temperature, while evaporation can occur at all temperatures.

Q.6 Give one relation between vapour pressure and boiling point?

ANS. Vapour pressure is inversely proportional to boiling point.

Q.7 How is a boiling point related to altitudes?

ANS. The boiling point decreases with an increase in altitude.

Q.8 Give the boiling point of water in kelvin?

ANS. 100°C or 373K

Q.9 What is the melting point of water in kelvin?

ANS. 0°C or 273K

Q.10 Why CaCl2 is used in melting snow?

ANS. Because CaCl2 lowers the melting point of snow which helps in clearing snow rapidly.

Saquib Siddiqui

Saquib Siddiqui is a Mechanical Engineer and a content creator. He has special interest in science experiments and teaches the same to school and college students. He is also a technical lead at RUDE LABS PVT. LTD.