dilute solution

Let us learn about dilute solution

Dilute solution is an unsaturated solution which contains comparatively small quantity of the solute, compared to what it can dissolve at that temperature.

1) What is the molar concentration of pure water?

Ans: Molar concentration = No. of moles /

Volume of solution in litres

Density of water = 1g/ml

= 1g/10^-3l

Mass of 1 litre of water = mass of 1000ml of water

= volume X density

= 1000ml X 1g/ml

= 1000g

Moles of water = 1000g/18

=55.55moles

Molarity of water = 55.55 M

2) 150 ml of water is added to 200ml of 0.02 M HCl. Calculate the molar concentration of the resulting solution.

Ans: First we calculate number of moles of HCl in 200ml solution.

In 1000ml of solution no. of moles of HCl is 0.02 M

In 200ml of solution no. of moles of HCl is?

= [0.02 X 200]/ 1000

= 4 X10^-3

Total volume of water and HCl = 150 + 200 ml

= 350ml

No. of moles of HCl in 350ml = 4 X10-3

Therefore molar concentration of 350 ml solution = [4 X 10^-3 ]/

[350 X 10^-3]

= 0.0114 M

In our next blog we shall learn how to answer biochemical test I hope the above explanation was useful.Keep reading and leave your comments.