Solubility

Melting point, boiling point, solubility in water and electrical conductivity provide clues about a substance’s particles, bonding and structure. In this investigation, the required substances are sodium chloride, magnesium sulfate, hexane, liquid paraffin, silicon(IV) oxide, copper sulfate and sucrose (sugar).

Solubility depends on the balance between the attractions holding the lattice together and the interactions between the ions and water molecules. If an ionic compound is insoluble, there will not be enough dissolved, mobile ions for its mixture with water to conduct well.