Question

1. acetic acid has a melting point of 16.6°c and a boiling point of 117.9°c. sketch a heating curve showing the phase changes of acetic acid. clearly label all 7 parts like we did in our notes.

Explanation:

A heating curve plots temperature vs. heat added, with flat segments representing phase changes (constant temperature) and sloped segments representing temperature increase of a single phase. For acetic acid:

1. The first sloped segment is solid acetic acid warming up to its melting point (16.6°C).
2. The first flat segment is the melting phase change (solid to liquid) at 16.6°C.
3. The second sloped segment is liquid acetic acid warming up to its boiling point (117.9°C).
4. The second flat segment is the boiling phase change (liquid to gas) at 117.9°C.
5. The final sloped segment is gaseous acetic acid warming as more heat is added.

All 7 labeled parts correspond to: 1) Solid phase warming, 2) Melting (solid → liquid) plateau, 3) Liquid phase warming, 4) Boiling (liquid → gas) plateau, 5) Gas phase warming, 6) Labeled melting point (16.6°C), 7) Labeled boiling point (117.9°C).

Answer:

A labeled heating curve for acetic acid is structured as follows (description, which can be translated to a graph):

• X-axis: Heat Added (increasing left to right)
• Y-axis: Temperature (°C, increasing bottom to top)

1. Segment 1 (Sloped, bottom left): Solid acetic acid, temperature rises from below 16.6°C to 16.6°C
2. Segment 2 (Flat, horizontal): Phase change: Solid → Liquid (melting), held at 16.6°C (melting point)
3. Segment 3 (Sloped, middle): Liquid acetic acid, temperature rises from 16.6°C to 117.9°C
4. Segment 4 (Flat, horizontal): Phase change: Liquid → Gas (boiling), held at 117.9°C (boiling point)
5. Segment 5 (Sloped, top right): Gaseous acetic acid, temperature rises above 117.9°C
6. Label for melting point: 16.6°C at the first flat segment
7. Label for boiling point: 117.9°C at the second flat segment