Chapter 8 Molarity Parts 1 & 2

Solutions Solute The substance that dissolves (the minor component of a solution). KMnO 4

Solutions Solvent The substance that the solute dissolves in (the major component of a solution).

KMnO 4 solution Solution A homogeneous mixture of the solute and solvent.

Solutions Dilute Concentrated

Concentration of a solution Molarity(M) is the moles of solute per liter of solution. Molarity(M) = moles of solute Liters of solution

Common Volume Units = 1000 mL

Common Volume Units = 1000 mL

Units of Molarity

2.0 M HCl

Units of Molarity 2.0 M HCl = 2.0 moles HCl L solution

Units of Molarity 2.0 M HCl = 2.0 moles HCl L solution 6.0 M HCl

Units of Molarity 2.0 M HCl = 2.0 moles HCl L solution 6.0 M HCl= 6.0 moles HCl dm 3 solution

Molarity Calculate the molarity of an aqueous Ba(NO 3 ) 2 solution containing grams of barium nitrate in L of solution.

Molarity Calculate the molarity of an aqueous Ba(NO 3 ) 2 solution containing grams of barium nitrate in L of solution g Ba(NO 3 ) L

Molarity Calculate the molarity of an aqueous Ba(NO 3 ) 2 solution containing grams of barium nitrate in L of solution g Ba(NO 3 ) L261.3 g mol

Molarity Calculate the molarity of an aqueous Ba(NO 3 ) 2 solution containing grams of barium nitrate in L of solution g Ba(NO 3 ) L261.3 g mol = mol Ba(NO 3 ) 2 /L = M Ba(NO 3 ) 2

Molarity Calculation NaOH is used to open stopped sinks, to treat cellulose in the making of nylon. It is also used to remove potato peels commercially.

If 4.0 g NaOH are used to make mL of NaOH solution, what is the molarity (M) of the solution? 0.20 mol NaOH/L = 0.20M NaOH

If 4.0 g NaOH are used to make mL of NaOH solution, what is the molarity (M) of the solution? 4.0 g NaOH mL

If 4.0 g NaOH are used to make mL of NaOH solution, what is the molarity (M) of the solution? 4.0 g NaOH mL40.0 g mol

If 4.0 g NaOH are used to make mL of NaOH solution, what is the molarity (M) of the solution? 4.0 g NaOH mL40.0 g mol L mL

If 4.0 g NaOH are used to make mL of NaOH solution, what is the molarity (M) of the solution? 4.0 g NaOH mL40.0 g mol L mL = 0.20 mol NaOH/L = 0.20M NaOH

Molarity Conversion Factors An NaOH solution has a molarity of 0.20M. Write this molarity in the form of conversion factors (ratios).

Molarity Conversion Factors 0.20 moles NaOH and L solution ____ L solution 0.20 moles NaOH

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Diabetes was the sixth leading cause of death on U.S. death certificates in Overall, the risk for death among people with diabetes is about twice that of people without diabetes of similar age. In 1999–2000, 7% of U.S. adolescents aged 12–19 years had impaired fasting glucose (prediabetes), putting them at increased risk of developing type 2 diabetes, heart disease, and stroke.

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Blood sugar is a term referring to the amount of glucose (C 6 H 12 O 6 ) present in the blood. A normal blood glucose level is about 0.083g in 100.0mL. What is the molarity of normal blood glucose? M C 6 H 12 O 6

How many grams of Na 2 SO 4 are required to prepare mL of M Na 2 SO 4 solution?

mL

How many grams of Na 2 SO 4 are required to prepare mL of M Na 2 SO 4 solution? mL L mL mL

How many grams of Na 2 SO 4 are required to prepare mL of M Na 2 SO 4 solution? mL L mol Na 2 SO 4 mL L mL L

How many grams of Na 2 SO 4 are required to prepare mL of M Na 2 SO 4 solution? mL L mol Na 2 SO g mL L mol mL L mol

How many grams of Na 2 SO 4 are required to prepare mL of M Na 2 SO 4 solution? mL L mol Na 2 SO g mL L mol mL L mol = g Na 2 SO 4

a a How to prepare 1000ml (1.000L) of a M solution of Na 2 SO 4.

In a college chemistry class you are asked to prepare mL solution of M NiCl 2 (gfm = 129.7g/mol).

How do you prepare the solution?

In a college chemistry class you are asked to prepare mL solution of M NiCl 2 (gfm = 129.7g/mol). How do you prepare the solution grams of NiCl 2

Add 3.24g of NiCl 2 to water in a half-filled ml volumetric flask.Add 3.24g of NiCl 2 to water in a half-filled ml volumetric flask. Swirl until completely dissolved.Swirl until completely dissolved.

Add water to the ml. mark.Add water to the ml. mark.

Thoroughly mix the solution by capping and inverting the flask several times or stirring the contents.

Information for Upcoming Mole Quiz How does a mole relate to particles, mass, atoms? (example: One mole of H 2 O is 6.02 x H 2 O molecules. It has a mass of 18g and contains 2 moles of H and 1 mole of O). Be able to use this information in factor-label problems. Be able to determine the number of grams/molecule. Identify the elements that exist primarily as diatomic gases. Do metric conversions.

Homework  Molarity Worksheet. (Note on question number 3 you must put your answers in sentence form in addition to solving the problem).