Experiment 10 :

To Determine Specific Heat Capacity of a Given Solid by Method of Mixtures

Theory 

In hypsometer, the solid is heated uniformly above room temperature up to a xed temperature and then solid is added to cold water in calorimeter.

Heat lost by solid = Heat gain by the water and calorimeter.

Procedure 

1. Put two thermometer A and B in a beaker containing water and note their reading. Take one of them, say A to be standard and and find the correction to be applied to the other, say B.

2. Put thermometer B in copper tube of hypsometer containing the power of given solid . Put sufficient water in hypsometer and place it on a burner.

3. Weigh the calorimeter with stirrer and lid over it by the physical balance . Record it.

4. Fill about half of calorimeter with water at about temperature 5 to 8°C below room temperatur Now, weigh it again and record it.

5. Heat the hypsometer about 10 minutes till the temperature of solid remains steady.

6. Note the temperature of water in the calorimeter. Now, transfer the solid from hypsometer to the calorimeter quickly. Stir the contents and record the final temperature of the mixture

7. Remove the thermometer A from calorimeter and weigh the calorimeter with its contents and lid.

Observations :

Calculations

Result :

Specific heat of given solid by method of mixture is…………cal g-1 °C-1

Precautions :

1. Sucient solid power should be taken to cover the tip of thermometer properly.

2. Sucient water should be taken in hypsometer.

3. Solid should be dropped quickly and gently.

4. Calorimeter should be polished  from outside to avoid excessive radiation

5. Temperature of cold water should not be below the dew

Sources of error :

1. 1. Some heat is lost while transferring hot solid into calorimeter.
2. 2. Some heat is lost in conduction, convection and r
3. 3. The bulbs of the thermometer may not be well inside the

Note : To determine the specific heat of given liquid by method of mixture, instead of cold water, take the liquid whose specific heat is to be determined and proceeded as in the experiment done for determining the specific heat of solid. The specific heat of solid is already calculated.

Viva-Voce  [Determining  Specific Heat Capacity of a Given Solid ]

 Question. 1. What is heat  ?

Answer. It is the energy which produces the sensation of warmth.

Question. 2. Define specific heat  of a substance ?

Answer. It is-dened as the amount of heat required to raise the temperature of unit mass of substance through  1°C.

Question. 3. State  the principle of calorimetery ?

Answer. Whenever substances at different temperature are mixed so as to exchange the heat. Heat lost – Heat gained.

when some quantity of heat is supplied  to it.

 Question. 5. Is heat  gained always  equal  to heat  lost ?

Answer. No, it is only correct if there is no chemical reaction takes place between its components.

Importance Of The Practicals 

Physics is one of the most important subjects in Class 12. As the CBSE exam approaches, students get busy preparing for different subjects. But an essential part of the CBSE exam is the practical exams which consist of 30 marks.

Students must know all the experiments along with theorems, laws, and numerical to understand all the concepts of 12th standard physics in a detailed way. Two experiments (8 + 8 marks) are asked from each section in the practical exam. The experiment records and activities consist of 6 marks, the project has 3 marks and viva on the experiment consist of 5 marks.

The Physics Practicals For Class 12 CBSE is given here so that students can understand the experiments in a better way. Students are suggested to study the theory and law behind the experiment properly before performing the experiment.Also Go through the viva voce questions and answers for each and every experiment which are provided on the website .