Concentration.

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Presentation transcript:

Concentration

Quick INquiry In a group, find 3 substances that are used in everyday life (or industry) that use the concentration measurements mol/L, ppm and %vv

Why do we need to know this? Knowing the concentration of a solution tells us how strong it is, and how quickly it will react!

Concentration The amount of a specific substance in a known volume of solution

Molar Concentration Number of moles in 1L of solution. Units are mol/L or M

C = n v

ExampleS What is the molarity of pure sulfuric acid, created by combining 12mols of sulfuric acid in 3500mL of water? What is the molarity of CaCl2 in a solution made by dissolving and diluting 15.0g of CaCl2 into 4.00L of water? What mass of NaOH is contained in 3.50L of 0.200mol/L NaOH? What mass of sodium chloride would be required to create a 5.0mol/L solution in a 2.0L volumetric flask?

PPM Parts per million is a measure of mg/L or mg/kg

Example A 200g sample from a bottle of water contains 0.0054g of mercury. Calculate the concentration of mercury in the sample in parts per million.

Percent by Volume % VV is a measurement of the amount of solvent in total solution. Just like in a test, the units for %VV are %

Example A hair product requires you to combine 20.0mL of hydrogen peroxide with enough water to produce a solution with a total volume of 120.0mL. Determine the percent by volume concentration of the solution.