Concentration of a solution refers to the weight or volume of solute in a specified amount of solution or solvent. According to chem.purdue.edu, it is a macroscopic property, meaning it describes the behaviors or characteristic of a sample which is large enough to see, weigh, manipulate, handle, etc.
It can be expressed in variety of methods:
1.) Specific Gravity is equal to:
since density is equal to mass/volume
Therefore Specific Gravity is equal to:
2.) Mass Percent refers to the mass of solute contributed to the total mass of solution. Mass Percent is equal to:
3.) Volume Percent refers to the volume of solute contributed to the total volume of solution. Volume Percent is equal to:
4.) Molarity (M) refers to the number of moles of solute present in a liter of solution. Molarity is equal to:
5.) Molality (m) refers to the number of moles of solute present in a kilogram of solvent. Molality is equal to:
6.) Normality (N) refers to the number of gram-equivalents of solute present in a liter of solution. Normality is equal to:
With the aid of the 6 formulas indicated above...
Have a try in solving the SAMPLE PROBLEMS:
1.) What is the molality of a solution prepared by dissolving 70.0g of glucose in 850g of water?
2.) A pickling liquor is prepared by dissolving 215mL of concentrated HCl solution in 450mL of water. What percent of the liquor is acid?
3.) Calculate the normality of a solution prepared by dissolving 45.0g of barium hydroxide in enough water to make 500mL of solution.