Class 9 Exam > Class 9 Notes > Science Class 9 > Procedure - To Determine the Boiling Point of Water, Lab Experiment, Chemistry, Class 9 Science
Procedure - To Determine the Boiling Point of Water, Lab Experiment, Chemistry, Class 9 Science | Science Class 9 PDF Download
Materials Required:
The Procedure:
Real Lab Procedure:
- Take about 25ml of distilled water in a boiling tube and add 2-3 small pieces of pumice stone.
- Close the mouth of the boiling tube with a rubber cork that has two bores and clamp it with the stand.
- Introduce a thermometer (temperature range -10 to 110°C) in one bore of the cork of the boiling tube. Keep the bulb of the thermometer about 3-5 cm above the surface of the water.
- Then introduce one end of a delivery tube in the second bore of the cork.
- Place a 250ml beaker below the second end of the delivery tube to collect the condensed water.
- Heat the boiling tube gently, preferably by rotating the flame.
- Note the temperature (t1) when the water starts boiling.
- Continue to heat the water till the temperature becomes constant, and the water remains boiling. Note the constant temperature (t2).
- Record your observations in tabular form.
Note: Pieces of pumice stone are added to water before heating to avoid bumping of liquid when the temperature rises. When water boils it releases energy as bubbles. If the bubbles do not form, the water can super heat and possibly explode. This could happen if the container is very clean and there is no means for the formation of bubbles. Adding pieces of rough stone gives lots of surface area for bubbles to form and release the energy gradually.
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FAQs on Procedure - To Determine the Boiling Point of Water, Lab Experiment, Chemistry, Class 9 Science - Science Class 9
| 1. What is the boiling point of water? |  |
Ans. The boiling point of water is 100 degrees Celsius (212 degrees Fahrenheit) at sea level. This is the temperature at which water changes from its liquid state to its gaseous state.
| 2. How can the boiling point of water be determined in a lab experiment? | |
Ans. To determine the boiling point of water in a lab experiment, the following procedure can be followed:
1. Take a beaker and fill it with distilled water.
2. Place a Bunsen burner or a heating apparatus under the beaker.
3. Start heating the water gradually and observe it carefully.
4. As the temperature rises, small air bubbles will start forming at the bottom of the beaker.
5. Continue heating until these bubbles rise to the surface consistently and vigorously.
6. Note down the temperature at which this occurs. This temperature is the boiling point of water.
| 3. Why is it necessary to use distilled water for determining the boiling point? | |
Ans. It is necessary to use distilled water for determining the boiling point because distilled water is free from impurities and contaminants. Impurities in water can affect the boiling point by raising or lowering it. Distilled water ensures accurate results by eliminating any variables that may influence the boiling point.
| 4. How does atmospheric pressure affect the boiling point of water? | |
Ans. Atmospheric pressure plays a significant role in determining the boiling point of water. At higher altitudes where atmospheric pressure is lower, the boiling point of water decreases. Conversely, at lower altitudes where atmospheric pressure is higher, the boiling point of water increases. This is because the pressure exerted on the water affects the strength of intermolecular forces, which impacts the boiling point.
| 5. Can the boiling point of water be altered by adding solutes? | |
Ans. Yes, the boiling point of water can be altered by adding solutes. Adding solutes, such as salt or sugar, to water raises its boiling point. This phenomenon is known as boiling point elevation. The presence of solutes disrupts the intermolecular forces between water molecules, making it more difficult for them to escape as vapor. As a result, a higher temperature is required to achieve boiling.
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