Daily Science April 30 Determine if the following are soluble or insoluble NaCl HgS LiOH Will there be a precipitate in the following reaction? NaCl + AgNO3 

Molarity Pg. 111

Molarity Tells you the concentration of a solution M The number of moles of solute dissolved per liter of solution Read as molar Must be in liters!

Calculating molarity M = moles of solute/ liters of solution Unit= mol/L or M Ex. What is the molarity of a solution containing 40.0 g of glucose (C6H12O6) in a 1.5 L solution? Ex. What is the molarity of a bleach solution containing 9.5 g of NaOCl per 500 ml of bleach

Preparing solutions If you know you need a certain molarity solution, you can calculate how many grams you need to measure out. You first have to add the solute to a volumetric flask Then you can fill the volumetric flask to the line with water Can’t just add the volume of solvent you need because the solute takes up space Ex. How many grams of CaCl2 would be dissolved in 1.0 L of a 0.10 M solution of CaCl2? Ex. How many grams of NaOH do you need to make a 1.5 L, 2.0 M solution of NaOH?

Diluting solutions Less concentrated solutions are diluted solutions You can determine how much solvent you need to add to dilute a solution from a stock solution M1V1 = M2V2 Ex. What volume of a 3.000 M KI stock solution would you use to make 0.300 L of a 1.25 M KI solution? Ex. How many milliliters of a 5.0 M H2SO4 stock solution would you need to prepare 100.0 mL of 0.25 M H2SO4?

Other Solutions Electrolytic solutions- contain dissolved salts that can conduct electricity. Heterogeneous solutions: Colloids- intermediate molecules mixed in a dispersion medium (ex milk) Suspensions- large particles mixed in a dispersion medium. Particles will settle or can be filtered out. (ex. Cornstarch and water)