Dressen-Molarity

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Slide 1:

Miscibility “ like dissolves like ” Two substances with similar intermolecular forces are likely to be soluble in each other. non-polar molecules are soluble in non-polar solvents CCl 4 in C 6 H 6 polar molecules are soluble in polar solvents C 2 H 5 OH in H 2 O ionic compounds are more soluble in polar solvents NaCl in H 2 O or NH 3 ( l ) 12.2

Slide 2:

A saturated solution contains the maximum amount of a solute that will dissolve in a given solvent at a specific temperature. An unsaturated solution contains less solute than the solvent has the capacity to dissolve at a specific temperature. A supersaturated solution contains more solute than is present in a saturated solution at a specific temperature. Sodium acetate crystals rapidly form when a seed crystal is added to a supersaturated solution of sodium acetate. Types of Solutions

Slide 3:

the procedure for preparing a less concentrated solution from a more concentrated solution Dilution Add Solvent Moles of solute before dilution (i) Moles of solute after dilution (f) = M i V i M f V f = Dilution

The 4 M’s of Concentration:

The 4 M’s of Concentration By: Derek Schroering Barbra Bannan Carrie Niekrash And Bonnie Kruft

Expressing Concentration:

Expressing Concentration Molarity (M) = moles solute/liters solution Molality (m) = moles solute/kg solvent Mass Percent (%) = mass solute/mass solution Mole Fraction ( c ) = moles solute/moles solution

Molarity:

Molarity M = moles solute liters solution Assumptions you can make: A 5.0 Molar Solution = 5 moles solute 1 liter solution Google

Example #1:

Example #1 Calculate the molarity of a solution that contains 5.8g KCl in 550mL of solution. Solution: 5.8g KCl x 1 mol KCl = 0.078 mol KCl 74.55g KCl 0.078 mol KCl = 0.55L solution Ans: 0.14M

Mass Percent:

Mass Percent % = mass solute x 100 mass solution Assumptions you can make: A 5.0% solution = 5g solute 100g solution

Example # 3:

Example # 3 What is the mass percent of 500g of water containing 6.50g of potassium nitrate? Solution: 6.5 KNO 3 x 100 = (500g +6.5g) soln Ans: 1.28 %

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