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How to mix a Standard Solution Zumdahl, Zumdahl, DeCoste, World of Chemistry 2002, page 480.

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Presentation on theme: "How to mix a Standard Solution Zumdahl, Zumdahl, DeCoste, World of Chemistry 2002, page 480."— Presentation transcript:

1 How to mix a Standard Solution Zumdahl, Zumdahl, DeCoste, World of Chemistry 2002, page 480

2 Process of Making a Standard Solution from Liquids Zumdahl, Zumdahl, DeCoste, World of Chemistry 2002, page 483

3 Markings on Glassware TC 20 o C to contain at a temperature of 20 o C TD to deliver T s time in seconds mL + 5%Range = 500 mL + 25 mL 475 – 525 mL Beaker Graduated Cylinder Volumetric Flask 500 mL mLRange = – mL

4 Concentration…a measure of solute-to-solvent ratio concentrated dilute lots of solutenot much solute watery Add water to dilute a solution; boil water off to concentrate it.

5 mol L M A. mass % = mass of solute mass of soln B. parts per million (ppm) also, ppb and ppt -- commonly used for minerals or contaminants in water supplies C. molarity (M) = moles of solute L of soln -- used most often in this class D. molality (m) = moles of solute kg of solvent

6 7.85 kg KCl are dissolved in 2.38 L of solution. Find molality g table sugar (i.e., sucrose, C 12 H 22 O 11 ) are mixed into 450 g water. Find molality. WRONG

7 What mass of CaF 2 must be added to 1,000 L of water so that fluoride atoms are present at a conc. of 1.5 ppm? = 3.34 x mcules H 2 O

8 How many moles solute are required to make 1.35 L of 2.50 M solution? mol = M L = 2.50 M (1.35 L) = B. What mass magnesium phosphate is this? A. What mass sodium hydroxide is this? mol L M 3.38 mol

9 Find molarity if 58.6 g barium hydroxide are in 5.65 L solution.

10 You have 10.8 g potassium nitrate. How many mL of solution will make this a 0.14 M solution? convert to mL

11 Concentration The amount of solute in a solution. Describing Concentration % by mass - medicated creams % by volume - rubbing alcohol ppm, ppb - water contaminants molarity - used by chemists molality - used by chemists

12 Concentration SAWS Water Quality Report - June 2000

13 Molality mass of solvent only 1 kg water = 1 L water

14 Molality Find the molality of a solution containing 75 g of MgCl 2 in 250 mL of water. 75 g MgCl 2 1 mol MgCl g MgCl 2 = 3.2 m MgCl kg water

15 Molality How many grams of NaCl are reqd to make a 1.54m solution using kg of water? kg water1.54 mol NaCl 1 kg water = 45.0 g NaCl g NaCl 1 mol NaCl

16 27dFields-Jeff/Solutions1.htm Molarity of Solutions


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