REVISION - CONCENTRATION OF SOLUTION

DAY 1
18.5.20
6 TH PERIOD

Good morning Boys,
Today we will be revising about methods of expressing concentration of solution.

Learning Outcomes ;
student will be able to

• Recall the formula
• Apply the formula

Limiting Reagent:

It is the reactant which  gets consumed first or limits the amount of product formed.

For a balanced reaction reaction:

                                    A +B →  C + D

B would be a limiting reagent if nA /nB > nB/nA

Similarly, A is a limiting reagent if nA /nB < nB/nA

Concentration of the solutions

Mass Percent:

• It is the mass of the solute in grams per 100 grams of the solution.
• 

Volume Percent:

• It is the volume of the solute  per 100 units of the volume of solution.
• 

Parts per million ( ppm):

• It is the amount of the solute in gram per million (106) gram of the solution.
• 

Mole fraction:

• It is the ratio of the moles of one component of the solution to the total number of moles of solution
• Total mole fraction of all the components of a solution is equal to 1.

Molarity (M):

•  It is the number of moles of solute dissolved per litre (dm3) of the solution.
• 

Molality (m):

• It is the number of moles of solute present in 1 kg of solvent.
• 

Note: Why m is not affected by change in temperature?

Since it is dependent on mass of solute and mass do not change to small shift in temperature due to close packing of solid atoms therefore it is independent of temperature change.



Thats all for the day.