A mixture of two liquids is said to be miscible when the state of this mixture is perfectly homogeneous, as opposed to an emulsion which is produced by mixing two immiscible phases. A precipitate is a solid which is formed when two liquids are combined and then react. It is a different substance to either of the reactants and does not dissolve in the reaction mixture. A precipitate is a solid which is formed when two liquids are combined and then react. It is a different substance to either of the reactants and does not dissolve in the reaction mixture.

All this is the topic of high school chemistry...That’s studied in more depth in chemistry courses...