How much is the solubility of potassium nitrate in 17 grams of water at 50 oC? @ 50oC 85g KNO3/ 100g H2O 85 x 100 = 17 x = 14.5 g KNO3

Describe a solution made from 7 g KNO3 in 10 g of H2O at 40oC: 7 g KNO3 = 70 g KNO3 10 g of H2O 100 g H2O supersaturated How many grams will precipitate ? X 70 – 64 = 6 g 6 g 100 g = x 10 g = 0.6 g KNO3

What type of solution is 30 g of potassium chloride in 60 g of water at 85 oC? 30 x 60 = 100 x = 50 g @ 85oC unsaturated

Describe a solution made from 7 g KNO3 in 10 g of H2O at 40oC: 7 g KNO3 = 70 g KNO3 10 g of H2O 100 g H2O supersaturated How many grams will precipitate ? X 70 – 64 = 6 g 6 g 100 g = x 10 g = 0.6 g KNO3

What is the mass % of potassium chlorate at 10oC? KClO3 @ 10oC 5 g 100 g KClO3 H2O 5 105 = 4.8 % part = solute whole solution (solute +solvent)

Describe a solution made from 7 g KNO3 in 10 g of H2O at 40oC: 7 g KNO3 = 70 g KNO3 10 g of H2O 100 g H2O supersaturated How many grams will precipitate ? X 70 – 64 = 6 g 6 g 100 g = x 10 g = 0.6 g KNO3

75 g NaNO3 Sat @ 35o 100 g NaNO3 = 75 g H2O 100 g H2O A solution is made of 90 grams of sodium nitrate in 75g of water at 55oC. How many grams will precipitate if the solution is cooled to 35 oC? Sat @ 35o 100 g NaNO3 100 g H2O 75 g NaNO3 = 75 g H2O   90 - 75= 15 g ppt

@ 50oC Saturated = 50g 100g 50 x 100 = 35 x = 17.5 g 17.5 – 11 = 6.5g A solution has 11 grams of NH4Cl dissolved in 35g H2O at 50 oC. How many more grams are needed to make a saturated solution? @ 50oC Saturated = 50g 100g 50 x 100 = 35 x = 17.5 g 17.5 – 11 = 6.5g

Describe a solution made from 7 g KNO3 in 10 g of H2O at 40oC: 7 g KNO3 = 70 g KNO3 10 g of H2O 100 g H2O supersaturated How many grams will precipitate ? X 70 – 64 = 6 g 6 g 100 g = x 10 g = 0.6 g KNO3