**What is concentration?**

**It is the amount(mass/volume) of a solute in a given amount(mass/volume) of a solution.It can be expressed in many ways.**

** Mass by mass percentage = (Mass of solute**/** Mass of solution)x100**

Question: If 49 grams of Sulphuric acid are dissolved in 100 grams of a solutions, calculate the concentration of this solution?

Thus using the above formula,

**Mass by mass percentage** = (49 g/100g)x100

= 49%

**Mass by volume percentage =(Mass of solute/ Volume of solution)x100**

Question: If 50 grams of glucose are dissolved in 100 ml solution, calculate the concentration of the solution.

Thus **Mass by volume percentage =(50g/ 100)x100**

=50%

**Volume by volume percentage =(Volume of solute/ Volume of solution)x100**

If 20 ml of pure HCl acid are dissolved in 50 ml solution, calculate the concentration of the solution.

Thus **Volume by volume percentage =(20 ml/ 50ml)x100**

= 40%