1 learning check if we dissolve 40.55g of fecl 3 in enough water to make 500. ml of the solution,...

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Learning Check

If we dissolve 40.55g of FeClIf we dissolve 40.55g of FeCl33 in enough water to in enough water to make 500. mL of the solution, what is the molarity make 500. mL of the solution, what is the molarity of the solution?of the solution?

Convert all unit:40.55 g FeCl3 1 mol FeCl3

=0.2500 mol

FeCl3162.20 g FeCl3

500. mL 1 L= 0.500 L

1000 mLPlug in to Molarity equation:

Molarity =0.2500 mol0.500 L

Molarity = 0.500 M solution

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Preparing SolutionsPreparing Solutions• Weigh out a solid

solute and dissolve in a quantity of solvent to make desired amount of solution.

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If a 6.0 L solution of 2.0 M HCl is diluted with 3.0 L of water, what is the new molarity?

DilutionsDilutions

M1V1 = M2V2

(6.0 L)(2.0 M) = (9.0 L)(M2)

12.0 mol / 9.0 L = M2

1.3 M

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• What volume must be added to a 60.0 L solution of 3.00 M NaOH to produce a 1.50 M sample?

Learning CheckLearning Check

M1V1 = M2V2

(60.0 L)(3.00 M) = (1.50 M)(V2)

V2 = 120. L

Volume to be added = 120. L – 60.0 L = 60.0 L

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What is Nickel (II) Chloride?

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What is Nickel (II) Chloride?

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What is Nickel (II) Chloride?

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Hydrate• Water is added in the

natural state.

9PROBLEM: Dissolve 5.00 g of PROBLEM: Dissolve 5.00 g of NiClNiCl22•6 H•6 H22O in enough water to O in enough water to make 250 mL of solution. make 250 mL of solution. Calculate the Molarity.Calculate the Molarity.

Step 1: Step 1: Calculate moles Calculate moles of NiClof NiCl22•6H•6H22OO

Step 2: Step 2: Calculate MolarityCalculate Molarity

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You Try!You Try!Make 100. mL of a 0.50 M solution of Nickel (II) Chloride

Then from that solution make a .25M solution