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SOLUTIONS Concentration Measurement: Molarity

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Chemistry Joke Q: What is this a picture of? A: A Polar Bear! + +

* A measure of the amount of solute that is dissolved in a given quantity of solvent. * A dilute solution is one that contains a small amount of solute. * A concentrated solution contains a large amount of solute. * When a concentrated solution is diluted, the amount of solute doesn’t change.

Concentrated and dilute are qualitative descriptions. There is a quantitative description. Molarity, M = moles of solute mol liters of solution L Abbreviated with a capital M, such as 6.0 M The most widely used concentration unit in chemistry. Brackets around a compound indicate molarity. [HCl]

* Rearrange the molarity equation to solve for each of the variables. M = mol = L =

* Sometimes the mass unit given in the problem is grams. * Before we can use the molarity equation, we’ll need to change it to moles. * Change 6.8 g NaCl to moles.

* Sometimes the volume unit given in the problem is mL. * Before we can use the molarity equation, we’ll need to change it to Liters. * 1 mL = L * Change 135 mL into L

* What is the molarity of a solution in which 10.0 g of AgNO 3 is dissolved in 500. mL of solution?

* How many grams of CuSO 4 5 H 2 O are needed to prepare 100. mL of a 0.10 M solution? (2.5 g)

* To what volume should 5.0 g of KCl be diluted in order to prepare a 0.25 M solution? (0.27 L)

* Often a needed concentration of solution is made by diluting a more concentrated or “stock” solution. * We use the equation M 1 V 1 = M 2 V 2

M 1 and V 1 are the concentrated, stock molarity and volume. M 2 and V 2 are the diluted molarity and volume. The volume units have to match each other but can be in mL or L.

It is helpful to make a chart of the known and unknown variables. How many milliliters of aqueous 2.00M MgSO 4 solution must be diluted with water to prepare mL of aqueous M MgSO 4 ? (20.0 mL) Stock, concentrated: Final, diluted: M 1 = ___________ M 2 = ___________ V 1 = ___________V 2 = ___________

Chemistry Joke Q: How do you make a 24 M solution? A: Put your artificial teeth in water!