Unit 8: Concentration and Molarity (M)

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Presentation transcript:

Unit 8: Concentration and Molarity (M) Objectives What is concentration How to calculate molarity How to dilute a solution Words to know Solution Solute Solvent Concentration Molarity Dilute Dilution

Concentration Concentration is a unit similar to density in the sense that it is a ratio Concentration is the ratio of solute to solution. For Kool-Aid this would mean the ratio between powder (solute) and the water + powder (solution) The unit of concentration that we will primarily be using is called Molarity (M) This unit is given by Moles of Solute (Powder) / Liters of solution (Water + Powder) Would a high concentration of Kool-Aid taste watery or sweet?

Dilution Diluting or dilution is when you decrease the ratio of solute to solution To dilute kool-aid would you … ? Increase the amount of powder Decrease the amount of powder Increase the amount of water D) Decrease the amount of water

Dilution formula The formula for dilution is given by C1V1 = C2V2 or M1V1 = M2V2 C = concentration V = Volume M = Molarity In this case our unit of concentration is M so C=M Try this question… Given 50 mL of a 2.0M calculate the new volume to make a solution of .5M? How much water would you have to add for the above question?