Question

To show balling point of
water and
melting point of ice.in activity form ​

Answer 1

Answer:

fig (I). fig( ii)

Explanation:

Take 25-30 ml of water in a boiling tube and add few pumice stones to it.

Clamp the boiling tube on iron stand with two holed cork, in one hole fix the thermometer and in the other one fix the delivery tube.

Place the thermometer above the water in the flask as shown in the figure and record its temperature.

Place a burner under the boiling tube.

Read the temperature and record it in the given observation table till the water boils. Record the reading after the time interval of 1 minute.

ncert-class-9-science-lab-manual-melting-point-of-ice-and-boiling-point-of-water-2

Observation Table

ncert-class-9-science-lab-manual-melting-point-of-ice-and-boiling-point-of-water

Result

Boiling Point of water is 100 °C.

Once the boiling point is attained the temperature reading on thermometer does not change for sometime.

(B)To determine the melting point of ice.

Take a beaker half-filled with the dry crushed ice obtained from distilled water.

Suspend a Celsius thermometer from the clamp stand such that the bulb of the thermometer is completely surrounded by ice.

Read the thermometer reading and record the temperature after every 1 minute till the ice melts and the thermometer reading remains stationary for 2 minutes.

Note the readings in the observation table.

ncert-class-9-science-lab-manual-melting-point-of-ice-and-boiling-point-of-water-4

Observation Table

ncert-class-9-science-lab-manual-melting-point-of-ice-and-boiling-point-of-water-5

Result

Melting point of ice is 0 °C.

Once the melting of ice begins the temperature remains constant for some time.