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Molarity= (moles solute)/(liters of solution)

or Concentration in % (w/v) = 100 x (mass solute in g) / (volume solution in mL)

Volume = Mass / Concentration

SOLUTE: The molecule or molecules in solution that you care about, such as DNA, a protein, or a salt.

SOLVENT: The liquid that the solute is dissolved in.

IMPORTANT NOTE ON UNITS:

Often beginning science students will do calculations writing down only numbers in their notebooks, without

the units. This is a terrible idea, and will cause you to make lots of mistakes! KEEP YOUR UNITS! Every

miles? Six minutes? Six hours? Six kilometers? Or six yards?

IMPORTANT NOTE ON CHECKING YOUR ANSWERS:

Whenever you do any kind of quantitative problem, you should calculate the answer, AND then check to see if it makes sense. For instance, if you ar

calculate that the final solution is GREATER than 1 molar, you should be able to notice that you must have

made an error. If you calculate that you are going to make a solution by adding a kilogram of solute to a

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