Expressing concentration of solution

Types of ways to represent the composition of a solution

• Quantitative

• Qualitative

Qualitative description of solution

1. Dilute solution

2. concentrated solution

Mass percentage

• Mass percentage of a component of a solution is defined as the mass of the component per 100g of the solution.

• Mass % = (mass of the component in the solution / total mass of the solution ) X100

Where does concentration of solution is described by mass percentage commonly

1. Industrial chemical application uses mass % to describe the solutions concentration

Volume percentage

• volume percentage of a component of a solution is defined as volume of component present in 100 unit volume of solution

• example: 10 % of ethanol is present in water means 10 ml of ethanol is dissolved in water such that the total volume of the solution is 100m

Mass by volume percentage

• Mass by volume percentage is defined as mass of the component present in 100 unit of volume of solution

why ethylene glycol is used in cars

• The ethylene glycol is a antifreeze

• It is a coolant ,elevates the boiling point to prevent from evaporating the liquid

• prevents the liquid from freezing in cold condition and cracking the engine

where is mass by volume percentage is used

Medicine and pharmacy

Mole fraction(x)

The ratio of number of moles of a component is divided by the total number of moles of all component

For containing i number of components ………………..

The sum of all components mole fraction will be equal to 1

What is the use full thing about mole fraction

• Relating some physical properties of solution

• example: vapour pressure with concentration of a solution

Molarity(M)

Molarity is defined as the number of moles of solute is dissolved in 1 litre of solution

Molality(m)

Molality is defines as the number of moles of solute per 1 kg of solvent