Objective of mixing
1) To form a uniform mixture.
2)To promote chemical reaction to get uniform product
3) Help in formation of suspension/paste
4) Help in mixing of water and oil .e.g. emulsion.
Different types of mixtures1) Positive Mixture-When two/more miscible liquids are mixed or soluble solid is dissolved in water, the mixtures are called as positive mixture .e.g. Solution. It is irreversible.
2) Negative Mixture-Two immiscible liquids are mixed or insoluble solids are mixed with water it forms negative mixture. E.g. emulsion, suspension, mixtures. It is reversible.
3) Neutral Mixture-The substances do not have tendency to mix but once mix, don’t separate after mixing. E.g. ointment, paste, cream.