separation of mixtures 2

The teacher reviews the previous lesson's assignment, providing examples of solid/liquid mixtures like muddy water and salt solutions, and explains how to regain salt from a salt/sand mixture using decantation. The current lesson focuses on separating solid-liquid mixtures, including insoluble (sand/water) and soluble (sugar/water) combinations. He introduces various separation techniques: decantation, filtration, and centrifugation. The lesson proceeds with examples illustrating these techniques, also pointing out that paper chromatography, may be used to separate the components of coloured dyes, like inks and pigments, from the extract of leaves.