Question

Which of the compounds below do you predict to be least soluble in water. Explain.

Sulfuric acid

Ethanol

Dichloromethane

C6NH3Cl

Answer 1

H₂SO₄ is strong acid it dissociate completely in water as follows

H₂SO₄ -----> H⁺ + HSO₄^-

When H₂SO₄ dissolved in water H⁺ ions of H₂SO₄ binds with surrounding polar water molecules therefore H₂SO₄ is miscible with water at all concentrations

C₂H₅OH is also miscible with water at all concentrations because it forms interhydrogen bonding with water

CH₂Cl₂ is less soluble in water because it does not form hydrogen bond with water approximately 13 g/L is miscible with water

C₆H₅NH₃CL is phenylammonium chloride is salt that is polar compound since water is also polar therefore phenylammonium chloride dissolve in water to the extent of 36 Gram/liter

terefore CH₂Cl₂ is least soluble