Flashcards: Solutions | Chemistry for JEE Main & Advanced PDF Download

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MOLARITY  
• Calculation of  molar mass of the solute 
• Find no of moles of solute ( amount of solute 
/molar mass) 
• Calculate the volume of solution in litre 
• Molarity =  no. of moles of solute /volume of 
solution in litre 
• It is expressed by ‘M’. 
Page 3


 
 
 
 
 
MOLARITY  
• Calculation of  molar mass of the solute 
• Find no of moles of solute ( amount of solute 
/molar mass) 
• Calculate the volume of solution in litre 
• Molarity =  no. of moles of solute /volume of 
solution in litre 
• It is expressed by ‘M’. 
MOLALITY 
• Finding the no. of moles of solute 
• Calculate the amount of solvent (mass of 
solution – mass of solute) in kilogram 
• Molality =  no. of moles of solute/mass of 
solvent in kg 
• It is expressed by ‘m’. 
 
Page 4


 
 
 
 
 
MOLARITY  
• Calculation of  molar mass of the solute 
• Find no of moles of solute ( amount of solute 
/molar mass) 
• Calculate the volume of solution in litre 
• Molarity =  no. of moles of solute /volume of 
solution in litre 
• It is expressed by ‘M’. 
MOLALITY 
• Finding the no. of moles of solute 
• Calculate the amount of solvent (mass of 
solution – mass of solute) in kilogram 
• Molality =  no. of moles of solute/mass of 
solvent in kg 
• It is expressed by ‘m’. 
 
Mole fraction 
• Mole fraction of a component  =   
•      No. of moles of a component / Total no. of 
moles of all the components 
• In a binary solution  if the no. of moles of A 
and B are n
A 
 and n
B
 , then mole fraction of A , 
                                 n
A
/n
A 
+ n
B
 
• The sum of mole fraction of all the 
components in a solution is unity . 
Page 5


 
 
 
 
 
MOLARITY  
• Calculation of  molar mass of the solute 
• Find no of moles of solute ( amount of solute 
/molar mass) 
• Calculate the volume of solution in litre 
• Molarity =  no. of moles of solute /volume of 
solution in litre 
• It is expressed by ‘M’. 
MOLALITY 
• Finding the no. of moles of solute 
• Calculate the amount of solvent (mass of 
solution – mass of solute) in kilogram 
• Molality =  no. of moles of solute/mass of 
solvent in kg 
• It is expressed by ‘m’. 
 
Mole fraction 
• Mole fraction of a component  =   
•      No. of moles of a component / Total no. of 
moles of all the components 
• In a binary solution  if the no. of moles of A 
and B are n
A 
 and n
B
 , then mole fraction of A , 
                                 n
A
/n
A 
+ n
B
 
• The sum of mole fraction of all the 
components in a solution is unity . 
 Numericals 
• Calculate the molarity of a solution containing 
5g of NaOH in 450 mL of solution. 
• Calculate molality of 2.5 g of ethanoic acid in 
75 g of benzene . 
• Concentrated nitric acid used in laboratory 
work is 68% nitric acid by mass in aqueous 
solution. What should be the molarity of such 
a sample of the acid if the density of the 
solution is  1.504 gram per mililitre.