How to express Concentration of Solutions- 01

Solution

Solution is a homogeneous mixture of two or more substances. For example: solution of water and glucose etc.
The various substances that a solution is made of are called as components of the solution.
When a solution contains only two components it is called as binary solution. The component in a binary solution that is present in large amount is called as sovent while the component that is present in small amount is called as solute.

Mass percent (m/m) % or weight percent (w/w) %

When temperature changes, there is no change in mass percent of the solution.

Test Your Self

Q1.1. 20 g of NaOH is dissolved in 80 g of water. Find w/w %.

Volume percent (V/V)%

When temperature changes, Volume Percent also changes.

Test Your Self

Q2.1. 20 ml of ethanol is dissolved in 230 ml of water to form a solution. Find v/v %.

Mass by volume (m/v)%

When temperature changes, Mass by Volume also changes.

Test Your Self

Q3.1. To disinfect water, 10g of chlorine is added to a water tank of capacity 1000L. Calculate w/v % of solution.

part per million (ppm)

‘ppm’ is used to measure concentration when solute is present in trace amount such as amount of oxygen dissolved in sea water or amount of pollutant present in atmosphere.
part = mass (gram), volume (ml) etc. When temperature changes, ppm may change or not.

Test Your Self

Q4.1. Find the concentration of oxygen (in ppm) if 6 × 10^-3 g of oxygen is dissolved in 1030 g of sea water.