Chapter 14.1, Problem 7R

To determine

The description of the energy changes of the acetic acid from $17°\text{C}$ to $118°\text{C}$ .

Explanation of Solution

Introduction:

The acetic acid undergoes either phase change or a rise in temperature due to heating. The latent heat causes the phase change and specific heat causes the rise in temperature.

The aceticacid below the temperature remains in the solid phase. The heating of the acetic acid causes the rise in temperature of the acetic acid. The melting point of the acetic acid is 17 degrees Celsius, so the phase of the acetic acid starts to change from solid to liquid at $17°\text{C}$ . The red line in the graph shows the rise of the temperature and the blue line shows the phase change.

  

Figure (A)

After the phase change at $17°\text{C}$ , the temperature of the acetic acid starts rising due to heating and it are shown by the violet line in the figure. The temperature of the acetic acid rises from $17°\text{C}$ to $118°\text{C}$ . The temperature $118°\text{C}$ is the boiling point of the acetic acid so at this temperature the acetic acid starts boiling.

Further heating beyond $118°\text{C}$ cause the phase change of acetic acid from liquid to gas. This part of the phase changes from liquid to gas as shown by the green line.

Conclusion:

Thus, the blue line, the green line shows the phase change and the red line, violet line in the graph shows the rise in temperature of acetic acid due to heating.