A solution is a homogeneous mixture of two or more substances. Which of the following solutions are possible?
Solid in liquid solution
Gas in liquid solution
Solid in solid solution
Gas in gas solution
The most common type of solutions that we come across are the ones with solids, liquids and gases dissolved in liquids. Sugar solution is an example of a solid-in-liquid solution. Aerated drinks like coke and pepsi are examples of gas-in-liquid solutions because of the dissolved carbon dioxide. Ink is a good example of a liquid-in-liquid solution.
Solid-solid solutions are alloys. Stainsteel is an alloy of iron and carbon. Brass in an alloy of copper and zinc.
Gas-in-gas solutions are very common. Air itself in an example of a gas-in-gas solution.