Do Now 1.If you were making the Gatorade from powder to give to the basketball players during March Madness, how would you make the Gatorade taste stronger?

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Presentation transcript:

Do Now 1.If you were making the Gatorade from powder to give to the basketball players during March Madness, how would you make the Gatorade taste stronger? 2.The Gatorade was too strong for the other team; how would you make it weaker?

Today’s Game Plan Do Now10 minutes Molarity20 minutes Dilutions20 minutes Practice20 minutes Exit Ticket10 minutes

Today I will be able to…. Calculate Molarity using a solute and a solution

An ionic solid dissolving.

Concentration Demo Looking at the test tubes, what happens to the color of the solution as concentration decreases? Use the known samples to determine the approximate concentration of the unknown test tube – Scientists have instruments called spectrophotometers that use color to help determine concentration.

Concentration How much solute is dissolved in a specific amount of solvent or solution Can use vocab: dilute (lesser) or concentrated (more) Example: One tea solution is more concentrated than the other – Darker tea has more tea particles than lighter tea

Molarity (M) – moles per liter It’s a concentration ratio!! Molarity (M) = moles of solute liters of solution Units used in ratio: Liters (L), moles

Another ionic solid… 4 Moles BaCl 2 Dissolve in 1 Liter of water

Another ionic solid… 4 Moles BaCl 2 Dissolve in 1 Liter of water _____ M BaCl 2 _____ M Ba +2 _____ M Cl - ? ? ?

Calculating Ion Concentration from Molarity…You Try Give the Concentrations of all the ions in each of the following solutions: 1)0.50 M Co(NO 3 ) 2 2)0.10 M Na 2 CO 3

Steps to Solve 1.Analyze the problem – Given:unknown: 2.Convert units Change grams to moles (if needed) Change milliliters to liters (if needed) 3.Plug information into formula Molarity (M)= moles of solute liters of solution 4. Round to significant figures

Example 1 There are 0.5 moles of sodium chloride dissolved to make 0.05 liters of solution. Find the molarity.

Step 1: Analyze the Problem There are 0.5 moles of sodium chloride dissolved to make 0.05 liters of solution. Find the molarity of the solution. Given: 0.5 mols NaCl, 0.05 L solution Unknown: ?? Molarity of solution

Step 2: Convert units Knowns are in L and moles NO CONVERSION!

Step 3: Plug into formula M = moles of solute Liters of solution M= 0.5 mols NaCl = 10 M 0.05 L solution

Step 3: Plug into formula M = moles of solute Liters of solution M= 0.5 mols NaCl = 10 M 0.05 L solution

Step 4: Round to Sig Figs Given: 0.5 mols NaCl 2, 0.05 L solution both givens only have 1 sig fig so answer will have 1 sig fig M= 0.5 mols NaCl = 10 M 0.05 L solution Answer has 1 sig fig so no rounding necessary

Example 2 Find the molarity of 0.60 grams of sodium chloride dissolved to make 1.5 liters of solution.

Horse Races Round 1 Use PARTNERS to check and NOTES 2 minutes per problem Start with 5 points

Practice 1 What is the Molarity of a bleach solution containing 9.5 mols of NaOCl and 1.2 L of bleach solution?

Practice 2 What is the Molarity of an aqueous solution container 40.0 g of glucose (C 6 H 12 O 6 ) in 1500 mL of solution?

Practice 3 What volume of 3.00 M NaCl is needed for a reaction that requires g of NaCl?

Today’s Game Plan Do Now10 minutes Molarity20 minutes Dilutions20 minutes Practice20 minutes Exit Ticket10 minutes

Molarity and Dilutions Let’s Do This!

In a dilution, your volume (L) and molarity (M) change, but the moles of solute (mol) remain the same. Moles of solute before dilution Moles of solute after dilution =

M x L = mol so… M 1 V 1 = M 2 V 2

You want to create a 3.00 M solution. What is the new volume of a potassium iodide 10.0 M solution that initially has a volume of L?

How much water must be added to L of 6.00 M HCl to produce a M solution? (Assume the volumes are additive)

Today’s Game Plan Do Now10 minutes Molarity20 minutes Dilutions20 minutes Practice20 minutes Exit Ticket10 minutes

Oh My Gosh…You Better Remember Your UNITS!!

Molarity and Dilutions Homework Show all work Make sure to include UNITS!!

Today’s Game Plan Do Now10 minutes Molarity20 minutes Dilutions20 minutes Practice20 minutes Exit Ticket10 minutes

Exit Ticket 1.Calculate the molarity of a solution containing 0.25mol of KBr in 135 mL of solution. 2.If 50.2 g of MgBr2 is contained in 0.65 L of solution, what is the molarity of the solution? 3.How would you prepare L of M NaCl solution using an available 2.00 M solution? a.What volume of the 2.00M solution would you use? b.How much water will you add to create your solution?