👉 An insoluble substance refers to a substance that cannot be dissolved in water or other solvents. In chemistry, an insoluble substance is typically a solid or liquid compound that does not dissolve completely when it is added to solution at room temperature (approximately 15°C). Examples of insoluble substances include sodium chloride (table salt), potassium dichromate (K2Cr2O7), and iron(III) carbonate (CaCO3). These substances are typically used in the production of fertil