You need to find a graph of solubility in your textbook. It should have temperature on the x-axis and "grams dissolved per 100 grams H2O" on the y-axis (or some such.)
Sodium nitrate is less soluble in cool water than warm. Use the graph to determine how many grams are dissolved at 50°C, multiplying by 2 since there are 200 grams H2O. Then determine how many grams are dissolved at 20°C, again multiplying by 2. Subtract the two numbers to find the grams that will precipitate
None, because there will be no precipitate.
Webassign, Huh?
50g
The weight/weight of CuSO4 in the saturated solution is 20%. This means that for every 100 grams of the solution, 20 grams are CuSO4.
50 grams
2.5 grams
This is from the website linked to the left of this answer under Web Links:Solubility in water, g/100 ml at 20°C: 74.5Therefore, in 1 liter, 745.0 grams of CaCl2 will dissolve to make a saturated solution.
An unsaturated solution of a solid can be made saturated by Heating. Taking for example, an ice block or fat; when heated.
50 grams
The solution become saturated ove 124,6 g potassium nitrate.
2.5 grams
The weight/weight of CuSO4 in the saturated solution is 20%. This means that for every 100 grams of the solution, 20 grams are CuSO4.
An unsaturated solution of a solid can be made saturated by Heating. Taking for example, an ice block or fat; when heated.
210
17. C} saturated
No. If a saturated solution is heated, it will no longer be fully saturated. Water at 25°C will be saturated with sugar at a ratio of 100 grams of sugar to 100 grams of water. At 50°C it would take 130 grams of sugar to reach saturation. See this link for a full explanation: http://www.scienceclarified.com/Ro-Sp/Solution.html
104g
Ammonium Nitrate! Fo sho doe.
Dissolve 2.0 grams of iodine and 6.0 grams of KI in 100.0 ml of H2O.
744 g/L of ammonium sulphate, at 20 0C