115k views
4 votes
Johnny is very careless in the lab. He purified two white solids (A and B) by re-crystallization, but forgot to label the vials. Both A and B have a melting point range of 10² - 10⁴ °C, so he is not sure which solid is which. He has a small amount of an authentic sample of pure A available in the lab. What should he do?

User Jasenkoh
by
8.6k points

1 Answer

0 votes

Answer:

The solution are in the explanation below

Step-by-step explanation:

- Find the melting point of authentic sample of pure A.

- Mix sample A into both vials.

- Use melting point depression

- Lower melting component will liquefy first, and melting point will lower/broaden the range. (Determine which vial holds sample B mixed with A)

- Vial with the same sample A melting point range would remain consistent to 102-104˚C.

User TheChumpus
by
7.7k points

Related questions

asked Sep 4, 2024 180k views
Tonyc asked Sep 4, 2024
by Tonyc
8.8k points
1 answer
1 vote
180k views
asked Dec 10, 2024 10.3k views
Sangbok Lee asked Dec 10, 2024
by Sangbok Lee
8.3k points
1 answer
4 votes
10.3k views