7.2 Molar Concentration Flashcards
How do we measure the concentration of solutions
concentration of solutions is measured in molarity
Molarity = Number of solute moles / litres of solutions
What do [] brackets denote
Remember that square brackets denote “concentration of”. Only the chemical (or ionic) formula should be placed inside of these brackets!
what is water’s relation to solutions
Water is the most common solvent and has the nickname “universal solvent”. Water, however, will not dissolve every chemical (imagine what walking in the rain might do to a person!).
What are the two ways to make solutions
Dissolving solute into solvent makes a solution
you can also dilute a solution by adding more solvent to make a new solution
what two formulas show the dilution of solutions
C1V1= C2V2where C = concentration, V = volume (and the subscripts 1 = initial and 2 = final)
- or -
M1V1= M2V2where M = concentration, V = volume (and the subscripts 1 = initial and 2 = final)
How do we show concentration of solutions
The concentration of a solution is usually given in moles per litre (mol LOR mol/L).This is also known asmolarity.
What symbol is given to molarity
Concentration, or Molarity, is given the symbol M.A short way to write that the concentration of a solution of hydrochloric acid is 0.01 mol/L is to write [HCl]=0.01MThe square brackets around the substance indicate concentration.
How do you calculate the new concentration of a solution with its old and new volume, and original concentration
To calculate the new concentration (M2) of a solution given its new volume (V2) and its original concentration (M1) and original volume (V1):
M2 = M1xV1 / V2
How do you calculate the new volume of a solution with its old and new molarity and original volume
To calculate the new volume (V2) of a solution given its new concentration (M2) and its original concentration (M1) and original volume (V1):
V2 = M1xV1 / M2
