Name the techniques used to separate the following: (a) Butter from curd (b) Salt from seawater (c) Camphor from salt

Solution:

1. a) A process known as centrifugation is used to separate butter from curd. The process is governed by the principle of density.
2. b) We can use the simple evaporation technique to separate salt from seawater. Distillation causes water to evaporate, leaving solid salt behind, hence the production of salt.
3. c) Sublimation can be used to separate camphor from salt, as during the phase change, camphor does not undergo a liquid phase.