day 3 week 2

#1 C.2:


1. a. 105g of potassium nitrate will dissolve in 100g of water at 60 C.
    b. 45g of potassium chloride will dissolve in 100g of water at 60 C.


2. a. 20g of potassium nitrate must be added to form a saturated solution at 30 C.
    b. 45g is the minimum mass of 30 C water that is needed to dissolve 25 g potassium nitrate.


3. on paper


#2 ISCS: 


1. Three teaspoons of sugar will completely dissolve in a serving of hot tea but will not dissolved in an equally sized serving of iced tea because of the temperature difference


2. The maximum mass of potassium chloride that will dissolve in 100.0g water at 70 C is 48.


3. a. on paper
    b. on paper
    c. on paper


4. a. 20 C - NaCl, KCI, KNO3
    b. 80 C- KNO3, KCI, NaCl


5. Saturated is when a solution remains undissolved as a solid on the bottom of the container, no matter how long you stir it for. Unsaturated is when a solution contains less dissolved solute than the amount that the solvent can normally hold at that temperature.


6. a. 31g is the maximum mass of KNO3 that can dissolve in 100g water if the water temperature is 20 C.
    b. This solution is supersaturated.
    c.  105g of the solid KNO3 should form.


7. a. If you add a crystal of KNO3 to an unsaturated solution, it will become saturated.
    b. If you add a crystal of KNO3 to a saturated solution, it will either remain saturated or become supersaturated.
    c. If you add a crystal or KNO3 to a supersaturated solution, it would cause the crystal to settle to the bottom, becoming a precipitate.


8. on paper


#3 Blog question: 


1. In order to solve these problems, I usually write them out on paper and break apart the problem into steps. Once I've done that, it becomes simpler for me to solve.