Give the correct answer to the following questions:
Answer the following questions with the help of the data given in table below.
Table: Solubility of various salts (in \(g\) per \(100\) \(g\) of water) at different temperatures
| \(10 °C\) | \(20 °C\) | \(30 °C\) | \(40 °C\) | \(60 °C\) | \(80 °C\) | |
|---|---|---|---|---|---|---|
| Potassium Nitrate | 21 | 32 | 45 | 62 | 106 | 167 |
| Sodium chloride | 36 | 36 | 36.3 | 36.5 | 37 | 37 |
| Potassium chloride | 35 | 35 | 37.4 | 40 | 46 | 54 |
| Ammonium chloride | 24 | 37 | 41 | 41 | 55 | 66 |
1. What mass of ammonium chloride is required to prepare a saturated solution in \(50\) \(g\) of water at \(20\) \(°C\)?
2. A student makes a saturated solution of potassium chloride in water at \(80\) \(°C\) and leaves the solution to cool at room temperature (\(25\) \(°C\)). What would she observe as the solution cools?
a. Solubility of potassium chloride decreases on cooling.
b. Excess solute comes out of solution.
c. Crystals of potassium chloride will form
d. More potassium chloride dissolves in the solution.
a. Solubility of potassium chloride decreases on cooling.
b. Excess solute comes out of solution.
c. Crystals of potassium chloride will form
d. More potassium chloride dissolves in the solution.